﻿134 BULLETIN 103, UNITED STATES NATIONAL MUSEUM. 



Tribe ANOMURA. 



Superfamily GALATHEIDEA. 



Family PORCELLANIDAE. 



PACHYCHELES LATUS, new species. 



Plate 57, ti-s. 21-23. 



I'ype-locality. — Costa Ilica ; Port Liinon. Pliocene series. Dr. 

 L. A. Wailes, collector. Station 42G9. Holotype, left manus with 

 propodal finger; inner proximal corner of manus broken off. Para- 

 type, left manus, with both fingrrs; proximal portion of manus 

 broken off. 



Type.— Cat. No. 324264, U.S.N.M. 



MeasureTnents. — Width of palm, 4.6 mm. ; length of same to sinus, 

 5.1 mm. ; length to end of finger, 6.T mm. ; greatest thickness, 2.3 mm. 



Holotype. — Outer and inner mai-gins thick and strongly curved 

 in dorsal view; upper surface covered Avith granules crowded to- 

 gether and of varying size ; the granules are continued on the outer 

 surface and a little way on the undv'r surface; they are then replaced 

 by squamiform granules and short rugae which are continued over 

 the inner surface. There are no marginal lines indicated. At the 

 distal end, the width from the articulating condyle to the inner angle 

 is nearly as great as to the outer margin. The fixed finger is short 

 and stout, width subequal to length; a bit of the tip is, however, 

 missing; a low tooth occupies the greater part of the basal half of 

 the prehensile edge. 



Paratype. — Smaller than the holotype and much worn so that the 

 granulation is not well marked. Tooth at base of immovable finger 

 minute. Movable finger xevj short and broad, granulate, with a 

 basal prehensile tooth, its surface granulate. 



In general shape and granulation, this form resembles the manus 

 of the Recent P. grossimanus (Guerin) from Peru and Chile, but in 

 the latter the outer margin is paved with larger granules forming a 

 definite edge, and the propodal finger is longer and more curved. 



PETROLISTHES AVITUS. new species. 



Plate 57. li-s. 18-20. 



Type-locaZity. — Costa Eica ; Port Lhnon. Pliocene series. Dr. 

 L. A. Wailes, collector. Station 4269. 



Type.— Cat. N"o. 324266, U.S.N.M. 



Holotype. — Palm of left cheliped, choAving the greater part of the 

 upper and lower surfaces including the inner margin and the distal 



