nSHERY BULLETIN: VOL. 78, NO. 2 



Table 2. — Ten most abundant species at each station along southern transect in Monterey Bay, Calif. Data are 

 number/square meter ± 95% confidence limits and percent frequency of occurrence in n samples in parentheses, x = 

 species that ranked 11-17 in abundance; B = semipermanent burrow; T = tube dweller. 



indicate a well-defined boundary between the two 

 populations (Figure 9). No Eohaustorius were cap- 

 tured in funnel traps, indicating that much of the 

 life history occurs on or within the sediment. 



The genus Paraphoxus, in contrast to Eohaus- 

 torius, has a wide depth distribution in Monterey 

 Bay (Barnard 1960). Four species occurred along 

 the subtidal transect in much greater densities 

 than populations from deeper portions of the bay 

 (Barnard 1960; Hodgson and Nybakken 1973) and 

 in more well-defined zones (Figure 2). A fifth 

 species was the intertidal Paraphoxus sp. cf. 

 grandis, a new species (Slattery in prep.). 



There is an obvious relationship between cer- 

 tain morphological characteristics and the depth 

 zonation of Paraphoxus spp. Larger species 

 reached their peak abundance in shallower water 

 (Table 3). Paraphoxus sp. cf. grandis and P. ob- 

 tusidens were giants relative to the other three 

 species (Table 3). This large size may be an adap- 

 tation to strong sediment motion (Sameoto 1969; 

 Fincham 1971). In contrast, P. epistomus and P. 

 lucubrans were more streamlined and slightly 

 larger than the deepest species, P. daboius. 

 Paraphoxus daboius was small and had poorly de- 

 veloped eyes (Table 3). It lived in the calmest 

 water (i.e., deepest) and finest sediment and was 

 the only peracaridean crustacean commonly found 



below 5 cm in the long cores. Paraphoxus were 

 captured by the funnel traps (Table 4). 



Euphilomedid ostracods were among the most 

 abundant crustaceans (Table 2). They occasion- 

 ally occurred in funnel traps (Table 4). In contrast, 

 cumaceans were not abundant on the bottom (Ta- 

 ble 2), but were numerous in funnel traps (Table 

 4). A number of other rare bottom dwellers were 

 also abundant in the funnel traps, including the 

 oedicerotid amphipods Synchelidium shoemakeri, 

 Synchelidium spp., and Monoculodes spinipes; 

 other amphipods A^y/us tridens, Tiron biocellata, 

 and Megaluropus longimerus; and a number of 

 mysids (Table 4). 



No general correlation exists between swim- 

 ming tendency and species zonation within the 

 crustacean zone. Although more active Para- 

 phoxus species were found in shallow water, 

 nonswimming Eohaustorius spp. lived at the same 

 depths. Moreover, the cumaceans and oedicerotid 

 amphipods were active swimmers (Table 4) and 

 occurred in relatively low numbers throughout 

 the crustacean zone. On the other hand, there 

 were distinct morphological patterns suggesting 

 greater swimming among shallower species 

 within particular groups (i.e., Paraphoxus and 

 Euphilomedes species); however, these groups and 

 others may enter the water column for very differ- 



444 



