No. 399.] WORTH-AMERICAN INVERTEBRATES. 219 
Genus Rocinela Leach. 
a. Eyes contiguous. Head produced into process in front. 
Rocinela oculata Harger, S, 252 fms. 
a’. Eyes not contiguous. Flagellum of second pair of antennz with four- 
teen to sixteen joints. 
b. Propodus of prehensile legs with two to four spines. 
c. First thoracic. segment with antero-lateral angles produced 
horn-like at sides of head. Frontal margin of head pro- 
duced. Rocinela cornuta Richardson, A, 625 fms. 
c. First thoracic segment normal. Frontal margin of head 
not produced. 
d. Spots present on both sides of the fourth thoracic seg- 
ment. Rocinela maculata Schicedte and Meinert, N 
d'. Spots wanting on fourth thoracic segment. 
e. Spots present on fourth and fifth abdominal seg- 
ment and base of terminal segment. 
Rocinela belliceps (Stimpson), A PD, surface to 1 38 fms. (See Fig. 6, p. 221.) 
g. Spots wanting on fourth and fifth abdominal seg- 
ments and base of terminal segment. 
Rocinela americana Schicedte and Meinert, NM, 85-157 fms. 
2’. Propodus of prehensile legs with five to six spines. 
Rocinela laticauda Hansen, APD, 82-660 fms. 
Genus Syscenus Harger. . . Syscenus infelix Harger, M, 231-435 fms. 
FAMILY IX. CYMOTHOID#. 
a. Head not at all immersed or set in the first thoracic segment. 
6. Uropoda inal tciliated. Eyes large, conspicuous. 
ZEgathoa Dana 
&. Uropoda and terminal segment not ciliated. Eyes small. 
c. Posterior angles of first thoracic segment prominent or pro- 
duced, very often acute ; posterior angles of the following 
segments increasing gradually in length, the first of these 
very often scarcely prominent, the posterior ones very often 
produced, abruptly longer than the first. Epimera of the 
first segments extending beyond the posterior angles of the 
segment ; posterior ones produced, acute. Nerocila Leach 
č. Posterior angles of first six thoracic segments scarcely or 
not at all prominent; those of the seventh segment pro- 
duced. Epimera of first segments very often almost or 
quite reaching, or not reaching by a short distance the 
posterior angle of the segment. 
d. Body compact. Head not constricted. Uropoda very 
often more or less longer than terminal segment. 
Legs gradually increasing in length. Anilocra Leach 
Oo 
