NO. 2 HARTMAN, BARNARD: RENTHIC FAUNA OF DEEP BASINS 95 



ure only 7 to 8 mm long for 24 segments; they are less than one mm 

 across. The body is widest at the third to fourth segments. Preserved, 

 there is no pigment. The prostomium is deeply incised at its frontal 

 margin and has a pair of antennae directed forward, much as in the 

 stem species, C. loveni Malmgren (1867, p. 176-177, pi. 16, fig. 33). 

 They extend forward nearly to the distal end of the palpi but are 

 much slenderer. Prostomial eyes are lacking. 



The 4 pairs of peristomial tentacles are in sets of 2, with the first 

 2 pairs on each side widely separated from the next 2 pairs. The first 

 2 parapodial segments are uniramous, as is typical of the genus; they 

 have ventral cirri which are bifurcated, present from the first, and 

 thus different from those of the stem species, where they are simple. 



Parapodia of typical segments (Plate 8, fig. 1 shows a tenth one) 

 have well developed notopodial and neuropodial lobes, and bifurcated 

 ventral cirri in which the ventral branch is the larger. The dorsal lobe 

 becomes very large and conspicuous; its cirrophore is carried distally 

 and bears the much slenderer dorsal cirrus at its tip. Acicula, largely 

 embedded, are black except for the base, which is colorless; they occur 

 singly in a ramus. Setae are pale yellow and delicate. 



The proboscis, seen only by dissection, has pale yellow, thin, trans- 

 lucent jaws, each piece (Plate 8, fig. 2) with 12 evenly spaced, distally 

 acutely pointed teeth. A few soft papillae are present on the oral ring 

 of the proboscis but their exact number and location have not been 

 determined. 



C. loveni pacifica may be compared with the stem species, C. loveni 

 Malmgren (1867, p. 176) first described from Sweden, and with C. 

 borealis Wesenberg-Lund (1950, p. 18) from West Greenland in 300- 

 550 fms. All three lack prostomial eyes and have a prostomium deeply 

 incised at the frontal margin. In C. loveni the jaws have 11 teeth, in 

 C. borealis there are 5 coarse teeth, and in C. loveni pacifica there are 

 12 teeth. Bifurcated ventral cirri are first present from the third setigerous 

 segment in C. loveni and C. borealis, whereas they occur from the first 

 in C. loveni pacifica. 



Another species of the genus, C. crosslandi americana Hartman 

 (1952, p. 16), is common off southern California, in shallow ocean 

 depths of 25 fms or less, where it is associated with a community of 

 Listriolobus pelodes Fisher (Barnard and Hartman, this volume, p. 6). 

 This species is readily distinguished from the deep-water one by having 

 prostomial eyes and by its much larger size. 



