NO. 2 HARTMAN, BARNARD: BENTHIC FAUNA OF DEEP BASINS 143 



The fourth segment differs in that it has 2 heavy, though similar, spines 

 on either side and is also shorter than those in front. Its anterior margin 

 is elevated and somewhat collarlike, and its notopodial setae are shorter 

 than those in the first 3 segments. Thereafter the segments are noticeably 

 shorter and neuropodia have transverse series of long handled uncini. 



Short, darkly pigmented, glandular rings surround the body at the 

 level of the setal ridges. The anal pore is located dorsoposteriorly, near 

 the end of a slightly inflated segment (Plate 15, fig. 3) in which the 

 epithelium is reticulated. 



Neuropodial uncini occur in transverse series numbering 10 to 15 

 in a row. Each is a flat plate with a large fang surmounted by a series 

 of smaller teeth in a single row. 



The tube is arenaceous, fully attached to the hard substratum, and 

 irregularly coiled and twisted. 



Lumbriclytnene lineus differs from other species of the genus in hav- 

 ing greatly prolonged segments anteriorly. It has been recovered only 

 from basin depths and is believed to be a deep water species. 



Lumbriclymene sp. 



Three anterior ends come from Tanner Basin, the longest measuring 

 8 mm long for 5 anterior segments. It lacks a cephalic plaque. Nuchal 

 organs are nearly right angled, with the 2 limbs almost equally long. The 

 peristomium lacks parapodia or setae. The first 4 segments increase in 

 length posteriorly. Parapodia are biramous from the first segment ; noto- 

 podia have slender, small setal fascicles and the first 4 neuropodia have 

 large, yellow acicular spines, numbering only 1 to a parapodium. The 

 fifth segment has neuropodia with few (2 to 4) transitional hooks, and 

 segments farther back have rostrate hooks. 



These specimens may represent an unnamed species, more abundantly 

 present in the outer series of basins, or in deep water. 



Genus PRAXILLURA Verrill, 1880 



Praxillura maculata Moore, 1923 



Moore, 1923, pp. 225-227, pi. 18, figs. 31, 32. 



Three specimens come from Santa Catalina Basin. This species is 

 previously known only through a single anterior fragment and tube taken 

 off Santa Cruz Island, in 447-510 fms, in black mud and rocks (Moore, 

 1923, p. 227). The following description is based on specimens collected 

 by the Velero IV. 



