iSir.] GENUS HIPPA; 161 



Inhabits the coast of the United States; common. 



Cabinet of the Academy. 



Thorax imbricately rugose before, riigag interrupted, 

 undulated on their edges; an impressed, abreviated, trans- 

 verse line, near the anterior teeth, and a curvelinear one be- 

 fore the middle; deflected margin dilated and ciliate be- 

 hind the middle, and subserrate before the middle; exter* 

 nal antemiis as long as the thorax, with the second joint 

 of the pedicel largest, of the colour of the thorax, and two 

 spined at tip: at the base before, of the anterior spine, a deep 

 fissure, forming almost a third tooth: third joint convex 

 above, with a fissure near the exterior tip; fourth joint cy- 

 lindrical, attenuated at base to receive an elongation of the 

 preceding one; eyes very small, pedicels filiform, promi- 

 nent; feet and dilated basal joint of the external pedipalpi 

 ciliated; anterior feet with the third joint dilated, and tra- 

 versed by impressed, interrupted lines of cilias; fourth 

 joint mucronate at the exterior tip' fifth triangular, mar- 

 gined within with reflected ciliae ^fl;?^/ margined on the 

 outside; tail and last segment of the body reflected under 

 the thorax, nearly reaching the base of the palpi, attenu- 

 ated, sublanceolate, margined, with reflected ciliae above, 

 and inflected ones on the edge, with two short impressed 

 lines at base. 



Length from the clypcus to tip of tall two-inches, 

 greatest breadth near three-fifths of an inch. 



Known generally on the coast by the name of Sand- 

 hug^ and may be found burrowed in the sand of the beach, 

 at the recess of the tide; its exuviae is frequent on the line 

 formed by the extreme wave. This species certainly 

 approaches very closely to the H, emerita of authors, but 

 Mr. Latreille observes of that animal, that the atennae are 



Vol. I. 1^ 



