10 NEW-YORK FAUNA — CRUSTACEA. 



margins, on the pedipalpi, anterior and posterior edges of the swimming feet, anterior edge 

 of the carpus, and interior margin of the hand, finger and thumb. 



Color. Shell light horn, with numerous reddish irregularly rounded spots having clear 

 spaces in the centre. Hands and feet whitish tinged with reddish, and spotted with dull red. 

 Hands silvery white beneath, bright red on the margins, and with large red spots. Tarsi 

 bluish horn, tipped with reddish : finger and thumb with their tubercles dark red. Beneath, 

 silvery white. 



Length, 2 '3. Transverse diameter, 2 '8. 



This beautiful species, of which the specimen described above is one of the largest size, is 

 common along our sea-beaches. Although occasionally eaten, it is not much esteemed as an 

 article of food. By the shore-dwellers, it is often designated as the Lady Crab, from the 

 beauty of its colors. 



GENUS LUPA. Leach. 



Transverse diameter of the shield usually more than double its length. Each latero-anterior 

 margin with nine prominent spines, of which the posterior is generally largest, and directed 

 externally and laterally. The external antennae inserted on the edge of the basillary joint, 

 which moves in a wide cavity under the internal canthus. Abdomen of the male with its 

 two last joints narrow ; of the female, wide, with its last joint very small, triangular. Tarsi 

 of the last pair oval, and adapted for swimming. 



LUPA DICANTHA. 

 PLATE III. FIG. 3. 



Porlunus hastahis. Fabricius, Supp]. Entom. Syst. p. 367. 



P. pelasgicus. Bosc, Hist. Nat. des Crustaces, Vol. 1, p 219, pi. 5, fig. 3. 



P. dicanthus. Latreille, Hist. Nat. des Crust, etc. Vol. 10, p. 190. 



Lupa hastata. Say, Jour. Acad. Nat. Sciences, Vol. 1, p. 65. 



Jjupea dkaniha. Milne-Edwards, Hist. Nat. des Crust. Vol. 1, p. 451, 



Itupa id. GorlLD, Invertebrata of Mass. p. 324. 



Description. Surface of the shield with distant granulations, becoming obsolete behind 

 others arranged in four transverse series ; two parallel with each other on the anterior part of the 

 shell, and one on each side running to the lips of the long posterior spines. Front with three 

 spines ; two on the plane of the shield, and one beneath it. From the base of this last, arise 

 the two internal antenna;, cleft at their tips. External antennae long, filiform, reaching the 

 fourth lateral spine. Anterior feet large, subequal, with three oblique spines on the anterior 

 edge of the arm, another at the outer tip, and two others near it, obsolete. Hands swollen, 

 sublinear, with five elevated granulated lines and a stout spine at the base, and three others 

 which are often obsolete near the fingers. Fingers incurved, with 12- 14 unequal tooth-like 

 tubercles in each. Second and third pair of feet subequal ; fourth shorter : all the joints of 





