1870.] NATURAL SCIENCES OF PHILADELPHIA. 415 



lower portion, fingers with long pencils of hairs; third, fourth, and 

 fifth pairs much larger and stouter. T} T pe Atya scabra Leach. 



o Genus Evatya Smith. 1 Kostrum prominent, carinate, with 

 spines above, anterior portion of carapax with scattered spines 

 and spiny carinations. Third pair of pereiopoda very stout and 

 tuberculate, basis and coxa anchylosed, ischium and meros firmly 

 united, propodus much shorter than carpus, dactylus very short, 

 unguiform. Type Evatya crasm Smith. 



o Genus Atyoida Randall. 2 Rostrum, antenna?, antennulae, and 

 the two anterior pairs of pereiopoda as in Atya; third pair of 

 pereiopoda elongate, scarcely stronger than the two anterior pairs. 



Known species : 



Type A. bisulcata Randall. 1. c. p. 140. Sandwich Islands. 



A. tahitensis Stm. Proc. Phila. Acad., 1860, p. 28. Society Islands. 

 A. mexieana Stm. Am. Journ. Sci. and Arts, II., xxvii. p. 446. 



Caradina mexieana Saussure, op. cit., p. 45, pi. iv. f. 26, Mexico. 

 A poeyi Guerin, in Raman de Sagra Hist. Cuba, Cuba. 

 A. glabra Kingsley. Proc. Phila. Acad., 1878, p. 93, West Coast 



Nicaragua. 



Genus Caradina M. Edw. Rostrum moderate, antennulae bi- 

 flagellate ; second pair of pereiopoda longer than first, fingers of 

 both pairs with pencils of hairs, carpus of first pair very short, 

 excavate in front, of second pair oblong, subcylindrical. Type 

 Caradina typus M. Edw. 



Genus Atyephyra Brito Capello. 3 Kostrum many toothed, 

 carapax with supraorbital and antennal spines; hands hairy, and 

 resembling those of Atya; eyes well developed. 1 Type A. rosiana. 



Genus Troglocaris Dormitzer. 4 Rostrum thin, with fine teeth 

 on the borders; supraorbital and antennal spines present; eyes 

 rudimentary, pereiopoda much as in Caradina. Type Troglocaris 

 schmidlii Dorm. 



1 Second and third Reports Peabody Academy of Science, p. 95 (1871). 



2 Journ. Phila. Acad., viii. p. 140 (1839). According to E. von Martens 

 (Archiv fur Naturgeschichte, xxxiv. pi. i. p. 47, 1868), this is not a valid 

 genus, as the young of Atya have the third pair of pereiopoda as in Atyoida. 



3 Discr. esp. now de Crustaceos de Portugal, p. 5, 1866. 

 * Lotos, III. p. 83 (1853). 



