386 PROCEEDINGS OF THE ACADEMY OF [1879. 



Charleston, S. C. Stimpson found it at Martha's Vineyard, Mass. 

 Dr. Packard collected specimens at Key West, Fla. ! 



Family PERICERIDiB Miers. 



Sub-Family Pericerinee Miers. 



Genus LIBINIA Leach. 

 Libinia dubia M. Edw. 



Libinia dubia M. Edw., Hist. Crust., i. p. 300, pi. xiv bis, f. 2. Streets, 

 Proc. Pbila. Acad., 1870, p. 104. A. M. Edw., Crust. Mex. et Am. 

 Cent., p. 129, pi. xviii, f. 5. 



Libinia distincta, Guerin in de Sagra's Cuba, p. 12. 



Northampton Co., Ta., Morehead Depot and Beaufort, N. C, 

 Little Sarasota Bay, Fla. Two males from the latter locality have 

 the following dimensions : 



Length of Carapax. Breadth. Ratio. Length of 2d feet. 



73 mm. 65 mm. 100 : 89 143 mm. 



64 mm. 50 mm. 100:78 104 mm. 



Other localities are Cape Cod to Florida (Smith); Nantucket, 

 Mass.! (Packard), Long Island (Streets), Charleston, S. C. (Gib- 

 bes), Key West! (Packard). 



Libinia emarginata Leach. 



Libinia emarginata Leach, Zoological Miscellany, iii. p. 130, pi. 108 



(1815). 

 Libinia canaliculata Say, Jour. Pbila. Acad., i. p. 77, pi. iv. f. 1. 



M. Edw., Hist. Crust., i. p. 300. Dekay, N. Y. Fauna, Crustacea, 



p. 2, pi. iv. f. 4. 

 Libinia affinis Randall, Jour. Pbila. Acad., viii. p. 107 (1839). 



Randall's types show no characters of specific importance 

 separating them from L. emarginata, and hence his name will 

 have to pass into synonymy. 



Prof. Webster's localities are North Hampton Co., Ya. ! Sara- 

 sota Bay! and Marcou Pass, Fla.! Other stations are Casco and 

 Cape Cod Bays (Smith), Massachusetts Bay! Nantucket, Mass.! 

 (Packard), Key West, west coast of Fla., and Nassau, N. P. 

 (Smith), W. C. North America! (Nuttall). 



Genus MICROPHRYS M. Edw. (= Milnia Stm.) 



Microphrys bicornuta. 



Pisa bicornuta Latr., Encyc. Method, t. x. p. 141. 

 Pericera bicoma M. Edw., Hist. Crust., i. p. 337. 



