230 Carcinological Fauna of India. 



are crenulate along the distal two-thirds, the crenulation being most 

 marked on the immobile finger. 



The legs have the meropodites compressed, and concave on the 

 ventral surface, the concavity being defined by two prominent longitudi- 

 nal lines of granulation ; the carpopodites dorsally subcarinate, but not 

 dilated ; the propodites carinate both dorsally and ventrally, but not 

 dilated ; and the dactyli narrowly lanceolate, and nearly as long as their 

 carpopodites and propodites combined. 



The abdomen of the male consists of 4 pieces, the third piece having 

 a strong tooth in the middle line : that of the female consists of only 

 3 pieces. 



Colours in life and in spirit : front pinkish-grey ; the rest of the 

 carapace ivory white covered with roundish crimson spots, which may 

 be scattered, or may form a definite network : thoracic sterna, abdomi- 

 nal terga and external maxillipeds with similar spots ; and a few similar 

 but larger spots on the upper surface of all the joints of the chelipeds : 

 legs banded with crimson. 



In the Museum collection are two adult males and a half-grown 

 female from the Madras side of Palk Straits, in 12 fms. and upwards. 



The carapace of the largest male is 12'5 millim. long and 12*5 

 millim. broad. 



60. Leucosia margaritata, A Milne Edwards. 



Leucosia margaritata, A. Milne Edwards, Nouv. Archiv. du Mas. X. 1874, p. 42, 

 pi. ii. fig. 3. 



Differs from L. hsematosticta, Ad. and Wh., only in the following 

 particulars : — 



1. Its size is even smaller, the carapace in the adult of either sex 

 measuring only 8'5 millim. in length and 8*5 millim. in breadth. 



2. The spongy pubescence on the base of the chelipeds, and the 

 fur along the postero-lateral edge of the carapace are coal-black. 



3. The hepatic regions are indicated by faint bulgings above the 

 antero -lateral border. 



4. The thoracic sinus is much shallower, being, in fact, almost 

 obsolete. 



5. The upper surface of the arm is bounded both in front and 

 behind by tivo rows of pearly tubercles. 



6. On the ventral surface of the basal joint of the external max- 

 illipeds there is a sharp stout tooth, and another on the ventral surface 

 of the ischium joint of the female. 



7. Colours in spirit : old ivory white, the carapace and chelipeds 

 elegantly reticulated with bright reddish brown. 



235 



