86 CARCINOLOGICAL STUDIES. 



Only by the examination of a large number of speci- 

 mens from the Chilian Seas this question can be resolved. 



22. P achy grap sus crassipes Randall. 

 (PI. 5, fig. 11). 



Pachygrapsus crasnpes , Randall , Journal of the Academy of Na- 

 tural Sciences of Philadelphia. Vol. VIII, 1839, p. 127. 



Pachygrapsus crassipes, Kingsley, in: Proceed. Acad. Nat. Sciences 

 of Philadelphia, 1880, p. 199. 



? Leplograpsus gonagrus , H. Milne Edwards , Annales Sciences 

 Naturelles, T. XX, 1853, p. 173. 



Two specimens, a male and an ova-bearing female, 

 collected by Mr. A. Forrer in the Gulf of California. 



The cephalothorax of this species is somewhat broader 

 than long, the proportion of the greatest width to the length 

 being as 6:5. The distance between the external orbital 

 angles is nearly exactly as long as the length of the cephalo- 

 thorax. The upper surface is somewhat convex anteriorly 

 as well as transversely. The cervical suture, bordering 

 the gastric region posteriorly , is distinctly developed , 

 and shallow depressions define the cardiac and intestinal 

 regions; a shallow groove proceeds in an oblique direction 

 from the base of the epibranchial teeth to the transverse 

 groove which separates the gastric and cardiac regions , bat 

 does not quite reach that groove. In front of this oblique 

 groove another oblique and shallow depression is observed , 

 bordering the gastric region laterally. In the male the 

 front is exactly half as broad as the greatest width of 

 the cephalothorax, in the female a little broader; the front 

 is obliquely inclined and its lateral margins diverge slightly 

 backwards. It is rather prominent, the delicately granu- 

 lated anterior margin is straight in the middle, but 

 slightly emarginate towards the lateral an- 

 gles, which appear obtusely dentiform, though 

 projecting not so far forward as the straight middle part of 

 the margin. The four postfrontal lobes are prominent, 

 tube rculi form, the two internal ones a little broader 



PS'otes from the Leyden IMuseum , Vol. XII. 



