No. 400.1] ANORTH-AMERICAN INVERTEBRATES. 299 
b. Lateral margins of head produced into two angulations. Terminal 
segment of the body, with central posterior portion acute, triangu- 
lar. Epimera evident . . ZJanthe triangulata Richardson, D 
V. Lateral margins of the head produced in one anterior angulation. 
Terminal segment of the body, with central ere portion 
nearly straight, rounded. Epimera not eviden 
c. Rostrum as long as the head. Flagellum of ES pair of antennae 
12-articulated, shorter than the breadth of the head. Fla- 
gellum of second pair of antennz 5o-articulated. First 
thoracic segment shorter than second. Second and 
third segments equal, and longest, much longer than 
seventh. Terminal segment smooth on dorsal side, 
without spine-like tubercle. Peduncles of uropoda 
longer than postero- 
lateral angulations of 
terminal segment. 
Janthe spinosa (Har- 
ger), W, 80-100 fms. 
Fic. 12. — Jeropsis Fic. 13. — Munna Fic. 14. — Eurycope 
lobata. fabricii. cornuta. 
c. Rostrum much longer than head. Flagellum of first pair of 
antenna 60-7o-articulated, nearly as long as the breadth of 
the head. Flagellum of second pair of antennz 280-articu- 
lated. First thoracic segment as long as second. Seventh 
segment longest. Terminal segment of body, with a single 
spine-like tubercle on its dorsal side. Peduncle of uropoda 
shorter than rd angulations of terminal segment 
of body . . Janthe speciosa Bovallius, V 
a’. Head without iet d, in place o à which i is small median point. 
Janthe erostrata Richardson, A 
Genus Janira Leach. 
a. Anterior margin of the head straight. 
Janira maculosa Leach, JV, 100-116 fms. 
a. Anterior margin of the head not straight. 
