128 LOPHOMENIA SPIRALIS. 



composed of cubical cells, those of the latter being twice the height of the others. 

 In the receptacle spermatozoa are numerous and are attached by their heads to 

 the wall. 



The anterior half of each ventral section of the cloacal passage (the shell 

 gland) is composed of cells of the appearance represented (Plate 18, fig. 8), filled 

 with a distinctly granular, darkly staining secretion. In the remaining half 

 the appearances are much the same save that the glandular material is of a pink 

 or reddish color. The halves, of the shell gland open into the cloaca by separate 

 pores and a fold, distended with blood, separates in large measure these openings 

 from that of the intestine. 



The nervous system is typical in its general features. In the labio-buccal 

 system two commissures unite the ganglia ventral to the pharynx ; one of these 

 bears a pair of small ganglia as in Strophomenia scandens (Plate 6, fig. G). One 

 commissure likewise passes dorsal to the pharynx. The relations of this system 

 are essentially the same as in Plate 6, fig. 6, with the exception of the most 

 posterior ventral commissure that appears to be lacking in the present species. 



Lophomenia spiralis, ^p. nov. 



This species, represented by two specimens (Plate 2, fig. 4), was taken in 

 the vicinity of Niihau Island (Sta. 4176) at a depth of 537-672 fath. ; bottom, 

 gray sand and foraminiferous mud; temp. 38.3 F. Both individuals were 

 closely wrapped about the stalk of a hydroid colony {Cryptolaria operculata 

 Nutting) and sections disclose the presence of nettle and other cells in the 

 alimentary canal from which we may infer that these forms, like Drepanomenia 

 vampyrella, prey upon the polyps. 



Both specimens were of almost identically the same shape and size, measuring 

 approximately 24 mm. in length and 1.5 mm. in average diameter. Each end 

 of the body terminates in a fairly sharp point but as the mouth is subterminal 

 and surrounded by well-developed lips it may readily be distinguished from the 

 cloacal opening that extends a short distance on to the dorsal surface. The 

 ventral furrow holds the usual position, being continuous with the cloaca poste- 

 riorly and in front terminating immediately behind the atrial opening. In one 

 individual where the pharynx was slightly retracted this groove appeared to 

 be directly continuous with the atrium but sections prove conclusively that 

 such is not the case. 



The opening of the pedal gland as usual occupies the anterior end of the 

 ventral furrow. Its position, shape, and general appearance are accurately rep- 



