144 Transactions of the Canadian Institute. [vol. ix 



Eugyra (Bostrichobranchus) pilularis Verrill. 



Syn. — Bostrichobranchus manhattensis Traustedt, Vid. Meddel., 

 ann. 1884, p. 22. 



No specimens were found in the vicinity of Eastport (where Verrill 

 obtained it). But in 10 fathoms sand at Grand Manan numerous speci- 

 mens were obtained which seem to be referable to Verrill's species. The 

 tubes are strongly retracted in all the specimens, but the 'collar' at the 

 bases of the siphons is very distinct. 



This is very evidently Traustedt's species as well. The only dif- 

 ferences apparent are explicable as due to a difference in size. Trau- 

 stedt having specimens with a diameter twice as great as that of the 

 largest in my collection. There is one exception. He describes the 

 margin of the anus as smooth. In two specimens examined, the margin 

 is reflected, but distinctly lobed (about 16 lobes). Evidently he has 

 overlooked this reflected margin. 



In £. glutinans and E. adriatica the entire margin of the anus is lobed 

 and free. In this species the inner margin or lip is fused with the pharyn- 

 geal wall and the line of fusion seems to be represented by an irregular 

 row of about 16 papillae, placed just in front of anus on the outside of 

 the pharyngeal wall. 



There are 15 tentacles, the largest bipinnate. The dorsal lamina is 

 broad and continued back behind oesophageal aperture and downwards 

 toward endostyle. 



Infundibula as in typical EugyrcB, consisting each of two stigmata 

 spirally coiled and not broken up into short stigmata. They are not in 

 regular rows. In a very small specimen not more than one row can be 

 made out between successive longitudinal bars. In one 8 mm. in diam- 

 eter there are two irregular rows and Traustedt has figured a larger 

 number for a much larger specimen. 



The oviduct passes along the left side of the rectum and opens only 

 a short distance from the anus. The testes are along the upper and 

 lower margins of the ovary. The vasa dejerentia are numerous (9 in 

 one specimen) and their free portions short, opening at various points 

 along the middle of the inner side of the ovary. 



The irregularity in the arrangement of the infundibula is not of 

 enough importance to warrant the formation of a genus for this species 

 as Traustedt has done, especially when there are as many points of agree- 

 ment between it and typical Eugyrce as the following: — 



Musculature reduced to siphonal region, with the exception of short 

 fibres arranged in one or two rows encircling the body in the median plane. 



Dorsal tubercle horseshoe-shaped, opening between horns directed 

 toward left side and slightly forwards. 



