COE: NEMERTEANS OF WEST AND NORTHWEST COASTS. 283 



Habitat not given, but ])robably Puget Sound. 



No specimens answering to the above description have come into 

 my hands, nor were any sj)ecimens or slides showing such anatomi- 

 cal peculiarities contained in Grittin's collection after it was turned 

 over to me. The absence of the intestinal caecum is especially 

 remarkable. 



Drepanophorus Hubrecht. 

 Aanteekeningen over die Anatomic .... Nemertinen. Utrecht, 1874. 



Body usually comparatively short, broad and much flattened, not 

 very contractile, and never coiled or much twisted. Mouth and 

 proboscis opening slightly separated. Pi-oboscis sheath possesses 

 raetamerically arranged lateral diverticula, commonly s})reading out 

 between the intestinal lobes as thin-walled sacs and connected with 

 the rliynchocoel by comparatively narrow openings. Proboscis 

 armed with numerous, commonly 20 or more, very small stylets 

 situated on a large, sickle-shaped basis, and with numerous pouches 

 of reserve stvlets. 



Cerebral sense organs very large, situated beside or immediately 

 behind the brain. Ocelli niimerous and of very large size. Lateral 

 nerves situated ventrally, beneath intestinal diverticula. Brain and 

 cephalic nerves very liighly developed. Xeurochord cells present. 



These worms are seldom more than 5 to 10 cm. in length, although 

 a few forms are among the largest of the Hoiilonemerteans. All are 

 capable of swimming. 



But a single species of this genus is represented among the collec- 

 tions at hand. 



74. Drepanophorus ritteri, sp. nov. 

 PI. 17, fig. 106 ; PL 20, fig. 128 ; -.PL 24, figs. 179-181 ; Text-fig. 22. 



Body comparatively short, flattened, or somewhat rounded on 

 dorsal surface, and broad, as in typical species of the genus. Head 

 small, distinctly demarcated from body by a pair of conspiciious 

 lateral grooves (PL 24, fig. 179). Each groove is traversed by 

 numerous transverse lines of paler color, so that it resembles a fluted 

 collar, very much as Joubin has figured for Atnp/iipoi'Ks marmora- 



