1^17.] GENUS PAGURUS. 163 



small, simple, somewhat concave on the disk, and termi- 

 nating in a rather obtuse point; hajids unequal, the right 

 one larger, covered with large and conspicuous granulae, 

 beneath crested, and dentated to the tip of the finger; 

 thumb above projected almost into a right angle; wrist 

 with scattered but larger tubercles than those of the hand, 

 subspinous above; thumb of the smaller claw not angu- 

 lated; thighs of the second and third pairs of feet, glabrous, 

 above rugose, two following joints glabrous, above spi- 

 nous, somewhat hairy; tarsi mucronate, nearly equal to 

 the two preceding articulations conjointly, ciliate with 

 hair, compressed and strongly marked by an impressed 

 line on each; appendice to the pedicel of the exterior an- 

 tennae as long as the eyes. 



Length of the thorax one inch and one fourth. 



A large species; it is often cast ashore during the pre- 

 valence of heavy north-east winds, otherwise it is not often 

 found. Inhabits our largest species of shells, such as Na- 

 tica rugosa, Pyrula camculatay Pyruly [Fulgur^ De Mon- 

 fort) elicea?7s, &c. 



2. P. longicarpus.^ Right hand larger and longer 

 than the left' wrist and /za/zf/ rather long, linear and granu- 

 late; j^w^e-r^ short, white, equal. 



Inhabits bay shores. 



Cabinet of the Academy, 



First segment of the thorax rounded, narrowed be- 

 hind, and truncate at tip; second segment gradually dila- 

 ting behind, emarginate at base for the reception of the 

 abdomen; small scales at the base above of the pedicels of 

 the eyes simple, concave on the disk, and terminating in 

 a rather obtuse point; anterior feet somewhat elongated; 



