A NEW SPECIES OF NEMERTEAN (Cerebratulus 

 melanops) FROM THE GULF OF 

 ST. LAWRENCE. 



\ 



\V. R. COE AND B. W. KUNKEL, 

 YALE UNIVERSITY. 



Among a small number of Nemerteans collected by Dr. J. 

 Schmitt at Anticosti was a single perfect individual of a species 

 of Cerebratulus which is apparently undescribed. This specimen 

 is of about the size and proportions of medium-sized individuals 

 of C. marginatus which probably occurs in the same region, but 

 from which the present species can easily be distinguished by the 

 color and by the possession of several distinct ocelli on each side 

 of the snout. C. grcenlandicus Punnett has recently been 

 described from Greenland ' and may also occur in the same 

 region as the present species, but the absence of ocelli in the 

 former is a sufficient specific distinction. In only a fe\v other 

 species of the genus are ocelli present in the adult worms, al- 

 though it is possible that they are generally present in very 

 young individuals. Besides the possession of ocelli the species 

 is remarkable because of the presence of a large number of effer- 

 ent nephridial ducts, although a number of other species, includ- 

 ing C. groenlandicus, possess this same peculiarity. 



The single specimen on which this diagnosis is based had been 

 preserved in formalin, and may be described as follows : Body 

 elongated, rather slender and ribbon-like, of the general size and 

 proportions of C. marginatus. After preservation, rounded in 

 esophageal region, moderately flattened posteriorly, tapering grad- 

 ually to posterior extremity. Head of moderate proportions as 

 in C. marginatus; mouth of large size, elongated, situated as far 

 back as posterior ends of cephalic furrows ; proboscis pore small, 

 subterminal ; cephalic furrows rather short, separated anteriorly 

 from each other and from proboscis pore. 



1 Proc. Zool. Soc. London, p. 99, 1901. 



