Figure 12.— Geographic distribution of species from the family Eusiridae in the Middle Atlantic Bight. 



range reported by Bousfield and our findings may be the 

 result of submergence of this species in the southern por- 

 tion of its range. 



Sediment Relationship. Bousfield (1973) reported that 

 this species is most commonly found on mud and gravel 

 bottoms. We found C. bigelowi on sand (28/41), sand- 

 silt (9/41), and silt-clay (4/41) sediments (Table 26). 



Table 26.— Sediment associations of Casco bigelowi 

 in samples from Middle Atlantic Bight. 



Elasmopua levis Smith 1873 



According to Bousfield (1973), this intertidal and 

 shallow-water amphipod occurs on rocky shores be- 

 tween Cape Cod and northern Florida. It occurred in 

 only two of our samples: off New York and in the lower 

 Chesapeake Bay (Fig. 13). Both of these stations were in 

 shallow water (8-13 m) on gravelly bottoms. The scar- 



city of E. levis in our collections is undoubtedly due to 

 its preference for rocky intertidal areas. 



Eriopisa elongata (Brnzelius) 1859 



Geographic Distribution. According to Barnard 

 (1971), this species is known from Iceland, Europe, tmd 

 the northeast Pacific. Our collections from the Middle 

 Atlantic Bight seem to be the first records of this species 

 from the east coast of North America. Eriopisa elongata 

 occurred in 28 samples from 25 stations between Cape 

 Cod and Cape May on the outer portion of the continen- 

 tal shelf (Fig. 13), and in low densities with a mean of 

 10/m-, ranging between 2/m2 and GO/m^. 



Bathymetric Distribution. Barnard (1971) gave a 

 depth range between 100 and 800 m for this species in 

 the Atlantic Ocean. In our collections, E. elongata oc- 

 curred between 64 and 188 m, but it was most common 

 (16/28) between 80 and 100 m (Table 27). 



Sediment Relationship. In our samples, this species 

 was found on shelly sand (1/28), sand (15/28), silty sand 

 (9/28), and silt-clay (3/28) sedimente (Table 28). 



Gammarus annulatus Smith 1873 

 Geographic Distribution. This species has been 



23 



