112 Bulletin, Vanderhilt Marine Museum, Vol. II 



The external maxillipeds have the ischium of the endognath dentate 

 along the inner margin and produced into a lobe at the anterior- 

 internal angle; the merus is a trifle longer in the median line than 

 the ischium and has the outer distal angle slightly produced and 

 rounded and the inner one emarginate with a slight peak on the distal 

 margin at the outer angle of the incision for the reception of the palp. 



The chelipeds are equal, moderately slender in the female, more 

 massive in the males. The meral joint in an old male extends forward 

 to midway the rostral horn; the carpus is small, rounded; the pro- 

 podus is one-third longer than the merus, the lateral margins subpar- 

 allel, the outer face moderately rounded and covered with large, 

 leopard-like spots of deep purplish magenta; the fingers are also 

 spotted, scarcely one-half as long as the palm, the tips meeting, spatu- 

 late and crenulate, a slight gape proximally in the fingers of large 

 male, and one elongate, sub-basal tooth on the upper finger; in 

 smaller males and females this tooth is obsolete. 



The ambulatories are very slender but strong and covered with 

 many hairs. The dactyli are strong, interlocking basally with a pro- 

 tuberance from the propodus, the tip is acuminate. 



Synonymy. — Pisa hicornuta Latreille, Eneyc. Meth. Hist. Nat. In- 

 seetes, vol. 10, p. 141, 1825. 



Pericera hicorna H. Milne Edwards, Hist. Nat. Crust., vol. 1, p. 337, 

 1834. 



Pisa hicorna Gibbes, Proc. Amer. Assoc. Adv. Sci., vol. 3, p. 170, 1850. 



Pericera hicornuta Guerin, in La Sagra's Hist. Nat. Cuba., p. xii, 

 1856. — VON Martens, Arch. f. Naturg., vol. 38, p. 85, pi. 4, fig. 5, 

 1872. — Gundlach and Torralbas, Ann. Acad. Habana, vol. 36, 

 p. 363, 1899 (1900), text fig.; reprint, p. 20, pi. 5, fig. 11, 1917. 



Pericera hicornis Saussure, Mem. Soc. Phys. Nat. Geneve, vol. 14, p. 

 427, pi. 1, fig. 3, 1858. 



Milnia hicornuta Stimpson, Ann. Lye. Nat. Hist. New York, vol. 7, 

 p. 180, 1860. 



Pisa galihica Desbonne, in Desbonne and Schramm, Crust. Guade- 

 loupe, p. 18, 1867. 



Pisa purpurea Desbonne, ihid., p. 18. 



Omalacantha hirsuta Streets, Proc. Acad. Nat. Sci. Phila., ser. 3, vol. 

 1, p. 238, 1871. 



