138 
THe Ottawa NATuRALIST. | October 
accurate corroboration, and this and other problems in the life of 
the Hair-eels offer subjects worthy of the attention of naturalists. 
LITERATURE. 
Grenacher. Zeit. f. Wiss. Zool., 1868. 
Villot. Ann. des Sci, Nat., CXIX. 
A. Macalister. Morph. of the Invertebrata. 
C. Gegenbaur. Elements of Comp. Anatomy. 
Thos. Brown. Anecdotes of Birds, Fishes and Insects. 
OWN 
ati 
once 
~I 
Packard. Zoology for Colleges and Schools. 
EXPLANATION OF FIGURES. 
Gordius aguaticus, natural size. 
Head end of same, shewing centrally situated mouth. x 36. 
Do. do. somewhat compressed under  cover-glass, 
viewed from the dorsum. x 150, 
Tail end of Gordius aquaticus, probably a female specimen, showing 
slight bifurcation. x 120. 
Tail end of male Gordius aguaticus (from Packard) 
Tail end of male Gordius varius, showing trifid termination (after 
Kingsley). 
Tail end of Gordzus ornatus, showing cloacal pore, enlarged from 
Grenacher’s figure. 
Ss, 
| 
| 
4 
| 
