162 *S'. I. Smith on A^nerlcan Crustacea. 



Lengfth of carapax, IS-imm Breadth of carapax, 22-9mni Ratio, 1 : 1-44 

 " " " 15-5 " " " 23-9 " 1:1-47 



Collected at Panama by F. H. Bradley. 



This species is closely allied to P. sphiicarpus, and it may possibly 

 prove to be identical with the species from Panama mentioned under 

 that name by Stirapson, Annals Lyceum Nat. Hist., New York, vol. 

 vii, p. 59. Edwards states, howevei', that, in his species, the teeth of 

 the antero-lateral margin are " aplaties et aigues," and they are so 

 figured on his plate, while in our species, all, except the posterior one, 

 are broad, truncate and denticulated. The carapax in his figure is 

 considerably broader, and the chelipeds seem to be much less robust, 

 than in P. ciliatus. Moreover, there are no hairs or cilia indicated in 

 the figure, on the carapax or the ambulatoiy legs, and they are not 

 mentioned in the description. 



The specimens, when received, were completely covered with fer- 

 ruginous mud. Their cylindrical form is well adapted for living in 

 holes, and this is quite probably the habit of the species, as it is of 

 Speocracinus, according to Stimpson. 



Euryplax Stimpson. 



Euryplax nitidus stimpson. 



Annals Lyceum Nat. Hist, New York, vol. vii, p. 60, 1859. 



Of this species, there is a specimen, in the Museum of Yale Col- 

 lege, collected at Egmont Key, west coast of Florida, and there is 

 another in the collection of the Peabody Academy labeled New Or- 

 leans, but probably from some part of the Gulf of Mexico. 



Both these specimens are adult males and agree perfectly with 

 Stimpson's description. The pit on the anterior surface of the merus 

 is exactly alike in both chelipeds and in each specimen. The antero- 

 lateral margins converge anteriorly so that the breadth of the cara- 

 pax between the anterior angles, is very much less than between the 

 posterior teeth. The anterior angle is obtuse, the second tooth is tri- 

 angular, but blunt, and the last is slender and acutely pointed. 



The male abdomen is broadest at the second segment, the sides of 

 which extend in narrow projections quite to the coxae of the posterior 

 legs. The first segment is narrow and is only exposed in the broad 

 excavation of the posterior margin of the carapax. The third seg- 

 ment is very broad and its sides project in acute angles, over the chan- 

 nel between the sixth and seventh segments of the sternum, nearly to 

 the coxse of the posterior legs. From the third segment, the abdo- 



