No. 393.] WORTH-AMERICAN INVERTEBRATES. 719 
73. Rostrum with 7 to 8 teeth above, 3 below P. ritteri Holmes D, Fig. 37 
Family PENEIDÆ. Third pair of feet the largest. 
G. Peneus Labreille. Rostrum elongate, external maxillipeds with 
exopodites. 
74. Both flagella of antennule very short; carapax sulcate near middle 
line . P. braziliensis Latr. M, S, D! 
74. Aaiteanilar dagola lane no 5 dukei near middle line . 75 
75. Carapax without median carina, rostrum entire below 
P. constrictus Stm. M, S — 
75. Carapax carinate to nearly posterior PIIN ; rostrum dentate below 
P. setiferus (L.) M. Gue M, S 
G. Sicyonia Milne-Edwards. Rostrum short; carapax carinate ; external 
maxillipeds without exopodite. 
76. Two teeth on median carina and two minute teeth on the rostrum 
. carinata (Olir.) M.-Edw. S 
76. Three teeth on median carina and four on the rostrum 
S. brevirostris Stm. S 
76. Three teeth on median carina, two on rostrum, the tip spined 
S. levigata Sm. 
76. Two teeth on median carina, three on rostrum S. dorsalis Kingsley S 
1 Possibly the specimens of P. canaliculatus of Holmes belong here. 
