1899.] A. Alcock — Carcinological Fauna of India. 135 



On the middle of the fourth abdominal tergum is a pair of large 

 smooth tubercles, exactly like pearls, in the closest contact with one 

 another. 



Carapace sub-cylindrical, longer than broad ; the regions hardly 

 indicated, though the branchial groove is fairly plain. 



Front triangular, deflexed, dorsally concave ; its apex is in close 

 contact with that of the epistome, and is surmounted by a horizontal 

 spine similar to the larger spines of the surface of the carapace. Supra- 

 orbital borders tumid. 



Antennal flagellum nearly as long as the carapace. 



Chelipeds equal, a little longer and stouter than the first three pair 

 of legs, and not much longer than the carapace. The fingers are short 

 and stout, and meet throughout their extent. 



The last pair of legs are slender rudiments, hardly longer than the 

 basal joints of the other legs. 



Colours in spirit, milk-white; eyes deeply pigmented. 



A single small male from the Andaman Sea, 75 fathoms. The 

 length of its carapace is 5 millim. 



Family III. DROMIIDJS. 



Key to the Indian Genera and Sub-genera of Dromiidae. 



I. Front much as in Dynomene, broadly triangular, dorsally 

 grooved, notched at tip. The sternal grooves of the 

 female do not quite reach to the level of the genital 

 openings on the 2nd pair of legs (third pereiopods) ... Sph^rodromia. 

 II. Front usually cut into 3, sometimes into 2, teeth, rarely 

 entire and triangular. The sternal grooves of the female 

 reach at least as far as the level of the bases of the 1st 

 pair of legs (2nd pereiopods) : — 



1. Third pair of legs, though shorter, not less stout 

 than the first two pair ; ending in a huge talon-like 

 dactylus : fourth (last) pair of legs short and very 



slender. Carapace flat and pentagonal ... Conchoecetes. 



2. Third pair of legs similar to, thoagh sometimes 

 shorter than, the fourth (last) pair. Carapace usu- 

 ally convex : — 



i. Fourth (last) pair of legs shorter than the 

 first two pair : — 



a. Legs smooth, the meropodites not 



specially dilated ... ... Dromia& Dromidia. 



fc. Legs nodular, the meropodites not 



specially dilated ... ... Cryptodromia. 



c. Legs nodular ; the meropodites of the 

 chelipeds and first or first two pair of 

 legs dilated, petal-like ... ... Petalomera, 



