several living specimens of Physalia. These were placed in a 50-gallon sea-water aquarium. Surface-water movements set up by the filter system soon caused the snail and one of the Physalia to drift together. The barnacles immediately seized the pendant polyps of the Physalia and began to ingest them. The barnacles near the bottom of the cluster seized the longer dactylozooids ( pl. I fig. 1), while others nearer the surface fed on the shorter digestive and reproductive polyps. Within a few minutes, the snail began to feed on the pneumatophore and the shorter polyps (pl. I fig. 2). Within 48 hours the Ianthina and the barnacles ate all or most of six Phy.ralia which had pneumatophores ranging from 20 to 40 mm long. Bayer (1963) reported that a single Ianthina consumed a much larger Physalia. within 1 day. Attempts to free the Ph y.ralia by pulling it away along the surface of the water caused the Ianthina to lose its hold, but the barnacles retained their grasp while the colony was towed rapidly several times the length of the aquarium. The presence of the cluster of Lepas on the snail may be advantageous to the snail in the procurement of food. For example, the barnacles, extending in many directions around the shell, contact potential food in a volume of water greater than that within the snail's sweep. The barnacles may secure large prey such as Phy.ralia against being blown or washed away by wind or waves. The contribution of the snail to mutualism appears to be only that of providing a substratum, and there is no evidence that Lepas an.reri f era prefers the shells of Ianthina over other available floating objects such as pumice, wood, or glass.

While the benefits of bank financing are relatively well understood, the costs are not. This paper argues that while informed banks make flexible financial decisions which prevent a firm's projects from going awry, the cost of this credit is that banks have bargaining power over the firm

scheduling algorithms simply shuffle packet processing orders according to some established rates or priorities for different data flows, to test a scheduling algorithm requires setting up the appropriate control state at each router along the data flow paths. I was challenged to design a set-up protocol

; and public policies affecting families and children. A second major focus is on the patterning of environmental events and transitions over the life course as these affect and are affected by intrafamilial processes. Special emphasis is given to critical research gaps in knowledge and priorities for future

Abstract-One of the major challenges of optical network operators is ensuring the stringent levels of availability required by their highest class clients. To achieve this, we introduce relative priorities among the different primary connections contending for access to the shared-protection paths

Motivated by cloud-based computing resources operating with relative priorities, we investigate the strategic interaction between a fixed number of users sharing the capacity of a processor. Each user chooses a payment, which corresponds to his priority level, and submits jobs of variable sizes

it is placed. A priority relation between evolution rules can be considered. The evolution is done in parallel for all objects able to evolve. In this way, we obtain a computing device (we call it a super-cell system): start with a certain number of objects in a certain membrane and let the system evolve

, and criteria for implementation. In the empirical review, common misuse of the term triangulation was apparent in evaluations that stated such a purpose but did not employ an appropriate design. In addition, relatively few evaluations in this review integrated the different method types at the level of data

This paper describes a new algorithm for solving the hidden surface (or line) problem, to more rapidly generate realistic images of 3-D scenes composed of polygons, and presents the development of theoretical foundations in the area as well as additional related algorithms. As in many applications

with relative priorities