628 A. E. Verrill — Turhellaria, Nemertina, and 



ered with angular or alveolar markings, often hexagonal, so as to 

 have a honej-comb-like appearance, but not arranged in definite 

 rows. 



Color, in formalin, is nearly white, except when containing eggs. 



Length, as™"" ; diameter, about LS-^"". 



One of the largest specimens has all the segments back of the 

 gastric region filled with eggs. 



Odontosyllis brachydonta, sp. nov. 



Similar to O. enopla in size and form, but easily distinguished by 

 the very short tapering oesophagus and the much smaller size of its 

 ventral teeth, and by the 4 well separated eyes. 



Head large, but smaller and narrower than in 0. enopla^ deeply 

 emarginate in front and with two prominent lobes, most prominent 

 and somewhat angular in front of the anterior eyes ; sides broadly 

 convex ; posterior margin cordate-emarginate. 



The buccal segment extends forward as a collar with median 

 and lateral lobes. Tentacle without articulations, stout at base, 

 rapidly tapered, in length about equal to the breadth of the head. 

 Antennai similar, about \ shorter. Upper tentacular cirri and many 

 of the dorsal cirri are larger and i to ^ longer than the tentacular 

 cirri, but similar in form, usually curled in contraction ; the longer 

 ones exceed the diameter of the body. Setse numei'ous and crowded, 

 slender, with small and short blades, ratio about 1 : 2-3 ; the tips are 

 distinctly bidentate, with the denticle somewhat removed from the 

 sti'ongly incurved tip. (Esophagus dark umber-bi'own, very short, 

 about as bi'oad as long, with the base neai'ly twice as broad as the 

 anterior end ; its edge is narrowly revolute ; the 6 ventral teeth are 

 small and short, with angular bases, in a regular row ; the four cen- 

 tral teeth are larger than the latei'al ; median tooth near the dorsal 

 margin. Stomach large, long-elliptical, light colored, shorter than 

 in enopla. 



The onl}^ specimen found has lost the caudal portion. It is sim- 

 ilar to 0. enopla in size. Each anterior segment is crossed by a 

 narrow dark line. 



Grubeosyllis nitidula, sp. nov. (See p. 634.) 



A very small, slender, nearly smooth species, consisting of about 

 25 setigerous segments; the antenna? and all the cirri fusiform with 

 slender acuminate tips ; eyes large, black ; setiie with relatively long 

 blades. 



