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PROCEEDINGS OF THE 



[May, 1854. 



edge spinulose, and a small spine at the anterior termination of lower edge. 

 Color, a reddish brown in the dry specimen. 

 Geo. Distr. — Florida Coast. 



Remarks. — Say's description of the second species in the manuscript notc3 

 above mentioned applies to this species ; he uses no specific name. Dana's 

 P. armata, Crust. U. S.Explor. Exp., is a different species, and he has since 

 changed the name to P. spinuligera, Crust. Expl. Exp., 1593. 



C. — FRONT TRIDENTATE. 



5. Porcellana sociata. Plate I., Jig. 6, natural size. 

 Synonymes. — Porcellana soriata, Say, Jr. Ac. Nat, $ci., vol. I., p. 456. 1818. 



Pisidia sociata, Leach, Diet, des Sd. Nat., torn, xviii., p. 54. 

 1820. 



Pisidia sociata, Desmarest, Consid. Gem sur les Crust., p. 

 199. 1825. 



Porcellana sociata, Milne Edwards, Hist. Nat. des Crust. y \o\. 



II., p. 258. 1837. 

 Porcellana sociata, Gibbes, Proc. Amer. Assoc., vol. III., p. 190. 



1850. 



Description. — Carapax nearly smooth, tuberculate before, tubercles in a 

 transverse line of four, obtuse, giving the front the appearance of being de- 

 pressed rather suddenly, edge of the front bent down; three toothed; eye not 

 very prominent ; external antenna, with filament about the length of carapax. 



Anterior feet nearly equal, in some the right, in others the left, the greater; 

 carpus, about two-thirds the length of carapax, smooth beneath, tuberculate 

 above, tubercles granulate, anterior edge granulate, with a large tooth near 

 articulation with third segment; hand smooth beneath, tuberculate above, 

 tubercles, granular like those of carpus, with a tendency to a longitudinal 

 linear arrangement; finger granulate, hooked at tip, opposing edges with 

 fine granular teeth. 



Color, dirty ivory white ; length about 0.2 of inch. 



Geo. Distr. — Atlantic Coast of Southern United States. 



Remarks. — In Say's original description the specific name is as I have 

 given it above, soriata. Leach, who received specimens from Say, gives the 

 specific name sociata, so that soriata is most probably a typographical error. 

 Desmarest and Edwards Use Leach's specific name, and I have done the 

 same, as there can scarcely be a doubt that it Was the one intended by Say 

 to be applied to his species. In 1847, Say's original specimens were in the 

 collection of the Academy of Natural Sciences in Philadelphia, but the label 

 could not be found to determine how he wrote the name. 



6. P. ocellata. Plate L, fig. 2, natural size. 

 SynonyMe. P. ocellata, Gibbes, Proc. Amer. Assoc., vol. 3, p. 190. 1850. 



Description. — Carapax about as long as broad, nearly smooth, without 

 spines, with distinct border running back; front trifid, middle lobe most pro- 



