402 PROCEEDINGS OF THE ACADEMY OF [1819. 



Genus ARATUS. 

 Aratus pisonii M. Edw. 



Sesarma pisonii M. Edw., Hist. Crust., ii. p. 76, pi. xix. f. 4-6. 

 Aratus pisonii M. Edw., Ann. Sci. Nat., II. xx. p. 187; Stm., Ann. 



Lye, vii. p. 232. 

 Sesarma (Aratus) pisonis von Martens, Wieg. Arch., xxxv. p. 12, pi. 



1, f. 4 (1869) ; id., xxxviii. p. 111. 



Specimens were collected at Sarasota Bay, Florida. It ranges 

 south to Rio Janeiro (Heller). I am unable to separate speci- 

 mens from the west coast of Nicaragua (McNeil) from the east 

 coast forms. 



Family PINNOTHERIDiE. 



Genus PINNOTHERES. 



Pinnotheres ostreum Say. 



Pinnotheres ostreum Say, 1. c, i. p. 67, pi. iv. f. 5. 

 Beaufort, N. C. 

 Pinnotheres maculatus. 



Pinnotheres maculatus Say, 1. c, i. p. 450. 

 Pinnotheres ostreum Smith, Fish Commisson, pi. i. f. 2. 



Beaufort and Morehead Depot, N. C. 



Genus PINNIXA White. 

 Pinnixa cylindrica White. 



Pinnotheres cylindrica Say, 1. c, i. p. 452. 



Pinnixa cylindrica White, List Crust. Brit. Mus., p. 33 ; Ann. and 

 Mag. Nat. Hist., xviii. p. 177 ; Smith, Fish Comm., p. 546, pi. 1, f. i. 

 Pinnixa laevigata Stm., Ann. Lye, vii. p. 68. 



Specimens were collected at Florida and Sarasota Bays, Fla. 

 It has previous^ been known from Vineyard Sound (Smith) to 

 South Carolina (Stimp.). 



Pinnixa chaetopterana Stm. 



Pinnixa cylindrica Stm., Ann. Lye, vii. p. 68 (non Say). 

 Pinnixa chwtopterana Stm., Ann. Lye, vii. p. 235. 



Eastern shore Virginia, Beaufort, N. C, and Florida Bay, Fla. 



LEUCOSOIDEA. 



Family CALAPPIDiE. 



Genus CALAPPA Fabr. 

 Calappa marmorata Fabr. 



Calappa marmorata Fabr., Suppl. Ent. Syst. p. 346 ; M. Edw., Hist. 

 Crust, ii. p. 104. 



