34 PROCEEDINGS OF THE ACADEMY OF [1880. 



CARCINOLOGICAL NOTES No. I. 



BY J. S. KINGSLEY. 



It is the intention of the writer in this series of notes to give 

 descriptions of new species, rectifications of synonj'my, facts 



relating to geographical distribution, and other matters of im- 

 portance concerning the Decapoda. Unless otherwise stated all 

 specimens are in the collection of the Academy of Natural Sciences ^ 

 of Philadelphia. 



Genus PSEUDOTHELPHTJSA Saussure. 

 {Potamia Latr. et Boscia Edw. preoc.) 

 Fseudothelphusa latifrons. 



Potamia latifrons Randall, Journal of the Academy of Natural 

 Sciences of Philadelphia, viii. p. 120. 



Carapax smooth, regions and sutures indistinct. Frontal crest 

 very prominent, uninterrupted. Front reflexed, making with 

 the surface of carapax an angle of about 45°, its margin undu- 

 lating and its surface and margin granulate. From the front 

 arise processes which all but join the inferior margin of the orbit. 

 Superior margin of orbit crenulated. Anterolateral teeth more 

 prominent than in any other of the genus and extending back to 

 the posterior third of the carapax. Below, the carapax is ever}- 

 where granulate and especiall}^ so on the sub-branchial regions 

 and near the mouth. Inferior margins of orbits denticulate. 

 Chelipeds nearly equal. Anterior surface of meros granulate, as 

 are the outer portions of carpus and upper portions of the hands. 

 The dactyli with rows of small tubercles above. 



The species is a true Pseudothelphusa, the antennae being as in 

 that genus, but the reflexed front gives it a peculiar appeai'ance 

 and with the larger anterolateral teeth will readily separate it 

 rom all other known forms. The emargination of the external 

 margin of the orbit is no more marked than in P. chilensis (Edw. 

 and Lucas) Smith, the type of which, by the waA', is in the 

 Museum of the Academy. 



Pseudothelpusa sinuatifrons (A. M.-Elw.) Smith. 



The locality of this species was not known to Alphonse Milne- 

 Edwards. There are two males in the Academy's collection from 

 San Domingo (W. M. Gabb}. 



