Bathymetric Distribution. Shoemaker (1930a) found 

 this species between 30 and 250 m in the Nova Scotia 

 area. In our collections, H. propinquus occurred between 

 15 and 190 m, but it was most common (20/29) and had 

 the highest densities (20-40/m2) between 40 and 80 m 

 (Table 37). The five stations south of Long Island are all 

 >80 m indicating that this cold-water sp)ecie8 submerges 

 in the southern portion of its range. 



Table 37.— Bathymetric distribution of Hippomedon 

 propinquus in samplea from .Middle Atlantic Bight. 



Table 39.— Bathymetric distribution of Hippomedon 

 terratu* in samples from Middle Atlantic Bight. 



Sediment Relationship. This species was found on a 

 wide variety of sediment types including gravelly sand, 

 shelly sand, shell, silty sand, and silty clay, but was 

 most often found on sand bottoms (21/29) (Table 38). 



Table 38.— Sediment associations of Hippomedon pro- 

 pinquut in samples from Middle Atlantic Bight. 



Sediment Relationship. According to Bousfield (1973), 

 H. serratus is usually found on sand and sandy silt bot- 

 toms. In our samples, it showed a strong preference 

 (61/66) for sand bottoms (Table 40). 



Table 40.— Sediment associations of Hippomedon ler- 

 ratus in samples from Middle Atlantic Bight. 



Hippomedon sp. A 



An undescribed species of Hippomedon was collected 

 at four of our stations along the continental slope east of 

 New Jersey (Fig. 21). These collections came from 

 between 225 and 474 m on sand (2/4) and silty sand (2/4) 

 sediments. The density of Hippomedon sp. A was low 

 (2-6/m-) at all four stations. 



Hippomedon sp. B 



Hippomedon serratus Holmes 1905 



Geographic Distribution. This species has been 

 reported from the Gulf of St. Lawrence to North 

 Carolina (Bousfield 1973). We collected H. serratus in 65 

 samples from 60 stations between Cape Cod and the 

 mouth of Chesapeake Bay (Fig. 20). It is worth noting 

 that this relatively common spiecies occurred in uni- 

 formly low densities ranging between 2/m^ and 90/m^ 

 with a mean of IS/rn'^ Hippomedon serratus showed no 

 latitudinal trend in its density, but it became a rare 

 species south of Delaware Bay. 



Bathymetric Distribution. Bousfield (1973) gave the 

 depth range of H. serratus as 5->75 m. We collected this 

 species between 13 and 89 m, but the highest mean den- 

 sities (20/m^), and the majority of the samples (49/65) 

 occurred between 30 and 59 m (Table 39). Hippomedon 

 serratus showed no clear evidence of southern submerg- 

 ence. 



A single specimen of a second undescribed species of 

 Hippomedon was collected at an abyssal station (2,925 

 m) east of Cape May, N.J., on silt-clay sediments (Fig. 

 21). 



Hippomedon sp. C 



Two specimens of a third undescribed sp)ecies of Hip- 

 pomedon were collected from an abyssal station (3,080 

 m) east of Sandy Hood, N.J., on a silt-clay bottom (Fig. 

 21). 



Lysianopsia alba Holmes 1905 



This species is found on shelly sands and in eelgrass 

 roots in protected waters from Cape Cod to the Gulf of 

 Mexico (Bousfield 1973). We collected L. alba at a single 

 station in Vineyard Sound on a gravel bottom at 37 m 

 depth (Fig. 21). 



36 



