NO. 2 HARTMAN, BARNARD I BENTHIC FAUNA OF DEEP BASINS 169 



Family SABELLIDAE 



Potamilla neglecta Sars, 1851, first recorded off northern Europe, and 

 southern California in 243 to 287 fms. 



A Potamcthus rnucronatus (Moore) 1923, in 2196-2228 fms, also in 

 447 fms. 

 Euchone magna Moore, 1923, in 75 to 271 fms. 



Family SERPULIDAE 

 Protis pacifica Moore, 1923, in 243 to 265 fms. 



Among this list, species not yet recovered by operations of the 

 Velero IV are some abyssal forms, especially scale-worms, and others 

 inhabiting rocky bottoms ; they are not satisfactorily sampled by the 

 grabbing device used on the Velero IV. Most of the species named in 

 the list have a range of distribution limited to California, or extend 

 northward to western Canada or Japan, and south to western Mexico; 

 a few are cosmopolitan. 



Bathymetrically considered, most of the species in the basins are 

 found also on the slopes (to 350 fms) or on the shelf. However, those 

 normally attaining their maximum abundance or development on the 

 shelf, are usually subnormal at basin depth. Those typically occurring 

 in basin depths seldom range to shelf depths. 



Deep water and/or abyssal polychaetes of world-wide areas have 

 been named and summarized by others. Mcintosh (1885) named 83 

 from collections of the Challenger expedition. Two species were 

 named from 3125 fms; 22 from 2000 to 3000 fms; 45 from 1000 to 

 2000 fms, and 14 species from depths of 600 to 1000 fms. The relative 

 numbers of species from different depth classes are not significant, since 

 there was no attempt at a method of grid sampling. However, it is sig- 

 nificant that none of the species were represented in more than one depth 

 class. The best represented families Or superfamilies were the ampharetids, 

 maldanids, terebellids, Eunicea and scale-worms. 



Eliason (1951) summarized 150 species from depths of more than 

 3000 meters (about 1500 fms). The families best represented were again 

 the ampharetids, scale-worms, terebellids, maldanids and serpulids. 



Kirkegaard (1954) recognized 213 abyssal species, of which only 11 

 are regarded as cosmopolitan ; but about half of these are eurybathal, 

 leaving only 5 abyssal cosmopolitan species. These are Laetmonice fili- 

 cornis Kinberg, L. producta willemoen Mcintosh (all scale-worms) and 



