in the Muse^ini of the Smithsonian Institution. 97 

 ]\otolopa« lamellatn^, nov. sp. 



Body and limbs pubescent. Carapax with an erect spine and two 

 tubercles on the gastric region, and a strong spine on each branchial 

 region, on the ridge near the outer end of the laminiform expansion 

 of the posterior extremity, which has a triangular tooth at the 

 middle. Rostrum half as long as the post-frontal part of the carapax. 

 From the antero-exterior angle of the buccal area a crest passes 

 backward, defining the pterygostomian region, which crest is armed 

 with two teeth, the anterior one largest. There is also a crest on 

 the sub-branchial region, along the bases of the feet, ending ante- 

 riorly in a projecting tooth. 



Length of carapax in a male, 0.63 ; breadth, 0.35 inch. 



Found at Panama by Capt. J. M. Dow, and at Man- 

 zanillo by John Xantus, Esq. 



Tyche lainellirrons. 



Tychelamdlifrons Bell, Trans. Zool. Soc, II. 58 ; pi. xii., f. 3. 

 Found at Cape St. Lucas by John Xantus, Esq. 



Acaiithonyx Petiveri. 



Acantlwnyx PeUverii H. Milue-Edwards, Hist. Nat. des Crust., I. 343. 



This is one of the few species which inhabit the shores of 

 both sides of tropical America. We liave it from St. Thomas, 

 collected by A. H. Eiise, and from Cape St. Lucas by John 

 Xautus. 



PodoiieiBia vesfita. nov. sp. 



This is the first species of the genus which lias been reported 

 from the Western coast. It differs from all of the East coast 

 species in its more hairy body, shorter ambulatory feet, and 

 notched outer lamina or crest of the basal joint of the an- 

 tennas. The sternum and basal joints of the feet are ver- 

 miculated. The penult joint of the ambulatory feet is some- 

 what thickened in its distal half. 



