1870.] NATURAL SCIENCES OF PHILADELPHIA. 387 



Pisa bicorna Gibbes, Proc. Am. Assoc, Hi. p. 170. 



Pericera bicomata Gnerin in Raman de Sagra, p. 12. Von Martens, 



Arch, fur Naturgesch., xxxviii. p. 85, pi. iv. f. 4. 

 Pericera bicornis Sauss., Crust. Mex. et Antilles, p. 12, pt. i. f. 3. 

 Milnia bicornuta Stm., Ann. Lye, vii. p. 180. 

 MicropJirys bicornuta A. M. Edw., Mission Sci. Mex. et Am. Cent. 



Crust., p. 61, pi. xiv. f. 2-4. 

 Pisa galbica et Pisa purpurea Desbonne and Schramm, Crust. Guad., 



p. 18. 

 Omalacantha Mrmta Streets, Proc. Phila. Acad., 1871, p. 238. 



Specimens were collected at Plantation Keys, Florida Bay, Key 

 West. Specimens from Plantation Keys gave the following- 

 measurements : 



An examination of the single specimen which formed Streets' 

 type of Omalacantha Mrsuta, which is preserved (in a dry state) 

 in the Museum of the Philadelphia Academy, convinces me that 

 Alphonse Milne Edwards was correct in supposing it a variety 

 of 31. bicornutus. It stands midway between the typical form 

 (fig. 3, of A. Edw.) and that described by Desbonne as Pisa galbica 

 (fig. 4, of A. Edw ). It, however, differs from both in a much 

 smaller chiliped. 



Tortugas (Stm.), Key West! (Packard), Antilles (Edwards, 

 Saussure), Bermudas (Smith), Guadeloupe (Desbonne), Mexico 

 (A. M. Edw.), Aspinwall! (McNiel), Desterro, Brazil (A. Edw.), 

 Abrolhos, Brazil (Smith). 



Genus MACR0C0LCEMA Miers. 



Macrocoeloma trispinosa Miers. 



Pisa trispinosa Latreille, Encyc. Method, x. p. 142. 

 Pericera trispinosa M. Edw., Hist. Crust., i. p. 336. Von Martens, 

 1. c, xxxviii. p. 84, pi. iv. f. 4. Schramm, Rev. et Mag. de Zool. 

 III., ii. p. 342. 

 Pericera nodipes Desbonne and Schramm, op. cit., p. 15, pi. v. f. 13. 

 Macrocceloma trispinosa Miers, Jour. Linn. Soc'y, xiv. p. 665. 



A single male was collected at Key West. Key West (Gibbes, 

 Stim.), Tortugas (Stm.), Cuba (Martins), Guadeloupe (Desbonne). 



