8 Miijor A. Alcock and Capt. A. K. S. Anderson on 



tlian in front, deep, inflated, tomentose, unarmed except for a 

 tew sliarp granules anteriorly and laterally ; two creases 

 break either lateral border, the posterior one being continued 

 to the cardiac region as the cervical groove. 



Front j)rominent, horizontal, bitid from its base. 



Antennule and eye retractile into an orbit almost like that 

 of iJromia. Eye-stalks long and slender, not completely 

 filling their part of the orbit; eyes sniall, but well-formed 

 and well-pigmented. Antennal flagella longer than the 

 carapace. 



Palate well delimited from the epistome ; the ridges 

 defining the expiratory canals very distinct ; external maxilli- 

 peds distinctly opercular, but with a pediform cast. 



Chelipeds equal, slender, though considerably stouter than 

 the legs, about If times the length of the carapace, unarmed 

 except ior a few sharpish granules, visible only when the 

 dense tomentum is removed ; the fingers well calcified, 

 hollowed en cuiVllre, the tip of the dactylus fitting into a 

 notch in the tip of the thumb. 



Legs cylindrical, smooth beneath a thick tomentum. The 

 first two pair are more than twice the length of the carapace; 

 their daetyli are stout, are about | the length of the preceding 

 joint, and are sharjjly spinatc along tiie posterior edge up to a 

 terminal claw. Tlie last two pair are about the same length 

 as the carapace, are subdorsal in position, and end in a small 

 claw-like dactylus that shuts down on a circlet of spines at 

 the end of the preceding joint. 



The sternal grooves ot the female end, without tubercles, 

 at the level of the openings of the oviducts. 



The abdomen of both sexes consists of seven separate 

 segments; the pleurai of the third to the sixth somites are 

 remarkably large and independent, and the last abdominal 

 tergum is nearly as long as the preceding five combined. 



Two males and a temale irom off the Travancore coast, 

 430 fathoms. 



This species at first sight might be taken for the Ilomolo- 

 droniia parudca'a of A. Milne-Edwards, in which, however, 

 it is stated that there are no orbits and that the antennules are 

 not retractile. 



Family Corystidae. 

 Tkaciiycarcinus, Faxon. 

 Trachycarcinus fflaucus, sp. n. 

 Carapace irregularly pentagonal, its surface coated with 



