204 PROCEEDINGS OF THE ACADEMY OF [1880. 



Dr. Stimpson's short diagnosis presents no characters which are 

 not held in common by both P. riedelii and pilipes, excepting the 

 non-pilose hand, which in other species of the genus is only of 

 sexual importance. 



P. riedelii Kingsley ex A. Milne-Edwards. 



Gnathograiisus riedelii A. M.-Edw., Nouv. Arch, du Museum, iv, p. 



182, PI. XXVII, f. 1-0 (1868). 



Celebes (A. M.-Edw.). 

 P. pusillus Heller. ^ ' 



Pfi/chognathns pusillus Heller, Riese der Novara Crustaceen, p. 60, 1867. 

 Onathograpsus barbatiis A. M.-Edw., Nouv. Arch, du Museum, ix, p. 

 316, PL XVII, f. 4, 1872. 



Carapax depressed, nearly smooth, with a few shallow impres- 

 sions anteriorly. Front slightly sinuate. Antero-lateral margin 

 with two indistinct teeth behind the orbital angle. Chelipeds finely 

 granulate, but without spines or tubercles. Hands of the male 

 with a lanose spot on the outside at the base of the fingers ; in the 

 female this is wanting. The exognath of the external maxillipeds 

 reaches only to the middle of the meros. Ambulatory feet slender, 

 compressed. 



Mauritius! (Guerin'); Nicohars (Heller); New Caledonia (A. M.- 

 Edw. ) 



P. pilipes Kingsley ex A. Milne -Edwards. 



Onathograpsus pilipes A. M.-Edw., Nouv. Arch, du Museum, iv, 184, 

 PI. XXVII, f. 6-10 (1868). 



This species is scarcely more than a variety of P. pusillus, but 

 I prefer for the present to leave them separate. 



Philippines and Celebes (A. M.-Edw.). 



Genus ACM^OPLEUEA Stimpson, 1858. 



Carapax depressed, the antero-lateral margins entire. External 

 maxillipeds nearly meeting the meros, bearing the palpus on the 

 middle of the anterior margin ; the exognath narrow. 



A. parvula Stimpson. 



Acmceopleura parvula Stimpson, Proc. Acad. Nat. Sci. Philadelphia, 

 1858, p. 105. 



Japan (Stimpson). 



Genus PSEUDOGRAPSUS M. Edwards (1837), reatr. 



Carapax depressed, transverse ; sides arcuate, with two teeth 

 behind the orbital angle. Front less than half the width of the 



1 These were labeled by Guerin " Sesarnia penicillata sp. ined." 



