86 ME. E. J. MIEES ON CETTSTACEANS EBOM VERA CETK 



and immature male of a species of Panopeus, which at preset 

 can scarcely be determined with certainty ; (2) three small ex- 

 amples of Pachygrapsus socius, Stimpson, which is very probably 

 merely a variety of P. transversus, as it is distinguished only by 

 the absence of the dark patch on the immobile finger, which is 

 always present in the typical transversus ; (3) a series of females 

 of a species of Pinnotheres, which I identify, although with some 

 hesitation, with P. angelicus, Lockington, and of which the follow- 

 ing is a description : — 



PlNNOTHEBES ANGELICUS. 



P. angelicus, Lockington, P. Cal. Ac. Sci. vii. p. 154 (1876). 



Carapace convex, smooth, shining, and naked, of a somewhat 

 quadrate form, with rounded angles, the lateral portions of 

 the cervical suture defining the gastric region usually distinct. 

 Pront rather broad, rounded or subtruncated anteriorly ; its 

 antero-lateral angles are prominent and dentiform. Merus joint 

 of the outer maxillipedes robust, with the outer margin regularly 

 convex ; the inner margin with a bluntly rounded angle near the 

 distal extremity ; carpus and propodus thick and robust, the latter 

 rounded and ciliated at its distal end ; dactyl very slender, styli- 

 form (not at all spatulate), and about reaching to the extremity 

 of the propodus. Anterior legs (in the female) slender, smooth, 

 and unarmed; propodus enlarging slightly to its distal end; 

 dactyl a little shorter than the superior margin of the propodus, 

 and as long as the immobile finger; both meet along their inner 

 margins when closed, and are clothed with a few hairs near the 

 distal ends. The ambulatory legs are slender and naked, with the 

 dactyli nearly straight ; the penultimate joint of the first is not 

 dilated distally, and the dactyl is very short ; the dactyl of the 

 second legs is nearly as long as the penultimate joint, that of the 

 third and fourth pairs relatively a little shorter, the last-men- 

 tioned being thinly ciliated on its inferior margin. 



Hab. Yera Cruz. (Several specimens, adult females with ova, 

 were taken from oysters, but no males were observed.) 



The specimens described by Mr. Lockington differ in having 

 the sutures of the carapace wholly obsolete, and the dactyl of the 

 anterior legs only half as long as the palm. If distinct, this 

 species may be designated P. Geddesi. If it be not distinct, 

 P. angelicus must be added to the rapidly increasing list of species 

 occurring on both the eastern and western coasts of America ; 

 and Pachygrapsus socius has a similar distribution, 



