NO. 2 HARTMAN, BARNARD: BENTHIC FAUNA OF DEEP BASINS 91 



Key to species 



1. Prostomium with eyes 4 



1. Prostomium without eyes 2 



2. Ventral cirri bifurcated . . Ceratocephala loveni pacifica 



2. Ventral cirri simple and cirriform 3 



3. Proboscis with paragnaths on both oral and maxillary rings 

 Nereis anoculis 



3. Proboscis without paragnaths on oral ring; largest paragnaths 

 present on area VII Eunereis caeca 



4. Paragnaths sparse and very inconspicuous . Nereis procera 

 4. Paragnaths moderately large and more numerous . Nereis sp. 



Genus NEREIS Linnaeus, 1758 



Nereis anoculis, new species 



(Plate 7, figs. 1-3) 



The type specimen comes from Tanner Basin ( Sta. 6345 ) ; it meas- 

 ures 120 mm long by 6 mm wide and consists of about 140 segments; 

 another one from the same basin (Sta. 6347) is 78 mm long by 4 mm 

 wide and has slightly fewer segments. A third one comes from San 

 Nicolas Basin (Sta. 6341). The body is pale or white except for the 

 distal ends and margins of parapodial lobes or median and posterior 

 segments; these are dull greenish gray, with the pigment most concen- 

 trated in the dorsal lobes, especially along the free margins. The body 

 appears ragged in its posterior half because of the long, widely spaced 

 parapodial lobes. Setae are translucent yellow and acicula are black 

 except for the deeply embedded bases, which are hyaline. 



The prostomium is pale, depressed, approximately six-sided, with 

 a narrow frontal margin which is as wide as the bases of the antennae 

 combined. The anterior paired sides are longest and the posterior margin 

 is straight. In one specimen the frontal antennae are paired, another 

 has a single antenna, probably atypical ; they extend distally about as 

 far as the paired palpi. The 4 pairs of peristomial cirri are simple, 

 cirriform, with the second dorsal pair the longest and about two and a 

 half times as long as the first ventral or shortest pair. The others are 

 intermediate in length. 



The proboscis, seen by dissection, has a pair of horny brown jaws 

 with 7 oblique blunt teeth on each cutting edge. On the maxillary ring, 

 area I has 1 to 3 very small cones, II has 4 large ones, III has 4 in a 



