1880.] NATURAL SCIENCES OF PHILADELPHIA. 203 



entering the orbit; Meros of the external maxillipeds about half 

 the length of the ischium, its outer distal angle rounded, its inner 

 excavate and bearing the palpas. 



E. liguricus Edwards. 



EuclnrograptiitK Uguneus Edwards, Archives du Museum, vii, p. 153, 



PI. X, f, 2 (1853). 



Nice (Edwards). 

 Genus BRACHYGRAPSUS nov. 



Carapax broader than long, arcuate, without transverse lineation, 

 sides nearlj^ straight, with one tooth behind the angle of the orbit. 

 Meros of the external maxillipeds shorter than broad, its external 

 distal angle prominent, the internal one bearing the palpus.^ 



B. Isevis nov. 



Front straight, external angles of orbit not prominent, tooth of 



lateral margin spiniform. Meros of cheliped triquetral, bearing an 



obtuse tooth on the upper border. Carpus with an acute internal 



spine. Hands inflated, smooth ; fingers acute. Ambulatory feet 



elongate, slender, but slightly compressed, the dactjdi longer than 



the propodal joints. 



New Zealand ! (E. Wilson). 



Genus PTYCHOGNATHUS Stimpson, 185S {Gxnihoffrajims A. M.-Edwards). 



Carapax flat, lateral border emarginate. External maxillipeds 

 verj' broad, nearly meeting, the exoguatli fully as broad as the 

 ischium. The carpus bears the palpus at the middle of the ante- 

 rior margin, and has the external distal angle strongly produced. 



Sijnoj^sis of Species. 



Exognath of external maxilliped extending to or exceeding the external 

 distal angle of the ineros. riedelii. 



Exognath extending only to the middle of the meros. 



Oblique portion of branchial ridge bounded by a granulated ridge. 



jnlipes. 

 Oblique portion without a prominent boundary. pvsUlus. 



Insufficiently characterized. glaher. 



P. glaber Stimpson. 



Ptychognathns (jlahcr Stimpson. Proc. Acad. Nat. Sci. Philadelphia, 

 1858, p. 104. 



Bonin I. (Stm. ) 



1 I am not certain as to the exact position of this genus, as it appears to 

 combine the characters of both the Cydometopa and Catometopa. In the 

 form of carapax and structure of the external maxillipeds it closely resem- 

 bles Trapezia. In the male genital appendages it is allied to the Grapsidce, 

 where for the present I prefer to allow it to remain. 



