Genera of Deep-sea Neniertinen. 1S7 



re mark a hie zigzap^ coiirsp. I Iinvc not found any structures 

 comparable to those which lluhrccht thinks may he of a 

 glandular character, observed by him in Pela<jonemertes. At 

 the thin mari,Mn of the body the muscles are reduced to a 

 sinjjle layer of fibres apiece. The epitheliimi of the ;;ut 

 has the appoaranco of beiii,^ in a macerated condition. It 

 jjresents a tincly reticular structure surr.nni lin*^ the gut- 

 cavity, but no cell-characters can be determined in it. 



The longitutlinal nerve-chords occupy relatively the same 

 position as in Pehujonemerlei^. As in that genus, the paren- 

 chyma stains most deeply where it surrounds the organs of 

 the body. 



Bathynrmertes, gen. nov. 



Body somewhat cylindrical, but flattened, especially at its 

 liinder end ; with a slightly constricted neck ; tapering 

 gra lually from the neck backwards, whilst the head is large 

 anil pointed anteriorly. Tlio mouth and j)robascis open 

 together a[)ically. The parenchyma is simihir to that of 

 the preceding genus. The body is pigmented. The gut 

 branches freely. 



The position of this genus is somewhat obscure. It 

 certainly differs considerably from other genera referred to 

 the Pelagonemertida;, all of which are flattened dorsi-ventrally 

 to a much greater extent than is Dathynemertes. The con- 

 .strictions at the "neck^' may be, perhaps, supposed to 

 indicate some relationship to Sectonemertes, Verrill ['92], but 

 there is no trace of *'cirrhi," and the mouth and proboscis 

 openings are united. Tt is possible that when this form is 

 more fully known it will be found necessary to create a special 

 family for its reception. 



Baihyriemprtes AlcocJci, sji. n. 

 (PI. Vlll. figs. 2, 3.) 



Station 310, lat. 13° 2'J' N., long. 9o° 29' E. (Z. E. V. 

 ^p). 1902. 



Length 10*5 cm., greatest breadth 2"7 cm. 



Kescmbles externally to some extent a Euborlasia. The 

 integument is tough and wrinkled and of a purple-brown 

 colour; the hinder extremity is to a great extent devoitl of 

 pigment, whilst there is a narrow colourless band running 

 along either side of the body, commencing at the aj)ex. 



The epidermis is not in a condition for histological descrip- 

 tion, but appears to be of the usual type. The basement- 

 uieuibrane is well-developed, about "UG mm. thick and deeply 



