No. 400.] MWORTH-AMERICAN INVERTEBRATES. 309 
Genus Bopyroides Stimpson 
a. Margins of body, specially at the head, very acute and somewhat 
recurved. Lateral extremities of the abdominal segments sharpl 
uare-cut . Bopyroides acutimarginata Stimpson, P 
a’. Margins of the beds not pka PEERS hippolytes (Krøyer), W 
Genus Cepon Duvernoy . . s . Cepon distortus Leidy, M 
Genus Pseudione Kossman i Pseudione giardi Calman, P 
Genus Phyllodurus pane . ; PAylldérin abdominalis Stimpson, P 
FAMILY XXIV. DAJID&. 
Genus Dajus Krgyer . . . . . . . + . Dajus mysidis Krpyer, V 
