20 NEW-YORK FAUNA — CRUSTACEA. 



men to the common Black-fish (Tautoga americana). I am indebted to my friend Mr. I. 

 Cozzens for an opportunity of examining many individuals of this species. It is sometimes 

 distinguished as the Warty Hermit Crab.. 



Pagurus LONGICARPUS. 



PLATE VIII. FIG. 22. 



Pagurus longicarpus. Say, Joum. Acad. Nat. Sciences, Vol. 1, p. 163. 



P. id. Milne-Edwards, Hist. Nat. des Crustaces, Vol. 2, p. 237. 



P. id. Godld, Invertebrata of Mass. p. 330. 



Description. Thorax for the most part concealed in the shell ; its first segment rounded, 

 narrowed and truncate behind ; second segment emarginate behind for the reception of the 

 abdomen. External antennae longer than the left hand, filiform, with an accessory filament 

 on the basal joint ; internal antennas setigerous at the tips. The ocular pedicels equal the 

 first segment of the thorax in length ; at the base of the pedicel, on the upper surface, is a 

 small scale, concave above, dilated behind, and pointed in front with a few setae. Second 

 and third pairs of feet subequal ; the two last joints, and more especially the penultimate 

 joint, punctured, with a series of seta? above : the last joint with a lateral impressed line. 

 Hand linear, granulate, with a slightly serrated edge beneath, extending nearly to the tips of 

 the fingers, which are smooth and polished ; internally the hand is somewhat ventricose. 

 Carpus equal in length to the hand, long, linear, with a raised moniliform edge on its upper 

 surface, with elevated dots and rigid seta?. 



Color. Body dark reddish brown ; fingers grey or whitish. 



Length of the whole animal, 1*5. 



This description is taken from an unusually large specimen ; they are, in general, much 

 smaller. It is the most common species on our coast, and may be seen running about our 

 shores with their attached shells. It is known as the Little Hermit Crab. 



( EXTRALIMITAL.) 



P. bernhardus. (Desmarest, Ioc. cit. p. 173, pi. 30, fig. 2. Gould, loc. cit. p. 329.) Shell with an 

 elevated medial line. Anterior feet with spinous tubercles. Second and third pair spinous and 

 tubercular above ; the last joint very thick, compressed, twisted upon itself, enlarging itself slightly 

 towards the extremity, which suddenly narrows to a point. Carpus as long as the palm of the hand, 

 rough and hairy. Color, bright cherry-red. Length, 5 *0 - 6 *0. 



This Pagurus of Northern Europe has been observed by Dr. Gould on the coast of Massachu- 

 setts. 



P. vittalus. (Bosc, Hist. Nat. des Crustaces, Vol. 2, p. 78, pi. 12, fig. 1.) Pincers nearly equal, tubercular 

 and hairy ; the second and third pair robust, with white longitudinal stripes. Thorax short, flat- 

 tened, slightly dentated in front, and furnished with long hairs. Common on the shores of South- 

 Carolina. 



