Citrcinological Fauna of India. 231 



In the Indian Museum collection are two adult males and an adult 

 female laden with eggs. All came from an encrusted bottom of shells 

 and shingle ; one from the Andamans, oue from the Malabar coast at 

 26-31 fms., and one from the Coromandel coast at 18 fms. 



61. Leucosia craniolaris, (Herbst.) 



?? Cancer craniolaris, Linnaeus, Mus. Lud. Ulr. p. 431, and Syst. Nat., 12th ed., 

 p. 1041. 



Cancer craniolaris, Herbst, Krabben, I. ii. 90, pi. ii. fig. 17; and (?) Fabr. Eut. 

 Syst. II. 441. 



Leucosia craniolaris, Fabr. Ent. Syst. Suppl. p. 350 : Leach, Zool. Misc. III. 

 p. 21: Milne Edwards, Hist. Nat. Crust. II. 122: Bell, Trans. Linn. Soc. 

 1855, p. 283, and Cat. Leucos. Brit. Mus. p. 6 : Miers, 'Challenger' Brachyura, 

 p. 325, pi. xxvii. fig. 3 : A. O. Walker, Journ. Linn. Soc. Zool, Vol. XX. 1890, 

 p. Ill: J. R. Henderson, Trans. Linn. Soc. Zool. (2) V. 1893, p. 397. 



Leucosia craniolaris, var. laevimana, Miers, Zool. H. M. S. Alert, pp. 184 and 250, 

 pi. xxvi. fig. A. 



Carapace rather sharply hexagonal, about six-sevenths as long as 

 broad : its surface perfectly smooth and devoid of hair : its antero- 

 lateral borders finely beaded, almost straight, and gradually converuin" 

 to join the sides of the truncate-triangular front without any abrupt 

 break : its true postero-lateral border beaded, the beading ending rather 

 abruptly at the level of the base of the first pair of legs (2nd pereio- 

 pods) : its thickened milled epimeral edge, which is continuous with 

 the posterior margin and ends at a sharp tooth just behind the base of 

 the chelipeds, is visible, dorsally, in all its extent when the carapace 

 is held, without any inclination, straight in front of the observer's eyes : 

 its posterior margin is almost straight and finely beaded, and the de- 

 flexed surface below it is covered with rows of sharp granules. 



The thoracic sinus is a deep cavity full of hair, and — when denuded — 

 is devoid of any tubercles or granules visible to the naked eye: it is 

 bounded in front by the finely beaded, or milled, convex edge of the 

 pterygostomian plate, so as to end in two broad notches of nearly equal 

 size. The convexities of the hepatic regions are an indistinguishable 

 part of the general convexity of the carapace. 



The front is prominent, dorsally convex, and truncate triangular ; 

 its length is less than its breadth ; and it ends in five prongs, the outer 

 of which on either side are the sharp external orbital angles, and the 

 middle oue of which is by far the most prominent. 



The ventral surface of the ischium of the external maxillipeds, in 

 the female, is strongly convex up to a strong terminal tootb. 



The chelipeds, in the adult nude, are two-thirds longer than the 

 carapace: the trigonal arm has beaded edges, the beading failing at the 

 distal end of the outer border, and being spread out and profuse at the 



236 



