I^otes on North American Crustacea. 235 



lateral margin witli sixteen small teeth ; superior frontal crest crenulated, 

 and not projecting beyond the inferior one. Chelipeds rather long; 

 meros with spinous edges; carpus with a large spine within; fingers 

 slender, not gaping, much longer than the palm. Ambulatory feet 

 nearly smooth, naked ; dactyli with three rows of spines above and two 

 below, spines {q'n in the lower rows. Length of carapax in the male 

 1.34 ; breadth, 2.14 inch. 



Found in fresh- water streams on the Island of Caba, near 

 Santiago, by Mr. Charles Wright. 



Piniiixa cylindrica. 



Pinnotheres cylindricum Say, Jour. Acad. Nat. Sci. Philad. i. 452. 

 Pinnixa cylindrica White, Cat. Brit. Mus. Crust. 1847, p. 33. 

 Finnixa laevigata Stimpson, Ann. Lye. Nat. Hist. N. Y., vii. 22. 



Upon further study of the American species of Finnixa, we 

 find that tlie true cylind/rica of Say is the species we described 

 in the last number of these " ISTotes" under the name of laevi- 

 gata, while the species we there considered as the cylindrica is 

 a new species, which we describe below under the name of P. 

 chaetopterana. 



This species is found as far north as Beaufort, North Carolina. 



Pinnixa cliaetopterana, nov. sp. 



Pinnixa cylindrica Stimpson, Ann. Lye. Nat. Hist. N. Y., vii. 22. 



Carapax very broad, thickly hairy about the sides ; surface uneven. 

 There is a very acute transverse crest on the cardiac region, broadly 

 interrupted at the middle, forming two prominent dentiform pro- 

 tuberances. Regions well defined by pubescent sulci. Front narrow, 

 with a deep median groove ; margin deflected at the middle to form 

 the interantennulary septum, so that the front, seen from below, forms 

 two arches. Hepatic region broadly expanded, rather depressed in 



