144 Memoirs of the Indian Museum. [Voi,. IV, 



allied species is obsolete, and its position is indicated merely by a low smooth eminence. 

 The customary proximal tubercle is present between the outer intermediate carinae 

 and the laterals. 



The telson differs from that of most of the preceding species in the entire absence 

 of lateral carinae. The intermediate carinae run towards, but are not continuous 

 with, those on the submedian marginal spines. The margin between the submedian 

 spines is provided with a number (about sixteen pairs) of minute spinules; there are 

 two sharply acute denticles between the submedians and intermediates and one between 

 the intermediates and laterals. 



The outermost of the two spines forming the bifurcate process of the uropod is 

 more than one and a half times the length of the inner, and reaches almost to the apex 

 of the exopod. There are ten or eleven movable spines on the outer margin of the basal 

 segment of the exopodite and the distal one, which is the longest, reaches to or beyond 

 the apex of the ultimate segment. 



In one of the specimens examined the rostrum is only slightly depressed in the 

 middle line, as figured by Tattersall,but there is a small incision, perhaps due to in- 

 jury, in the middle of the distal margin. In the outer example the centre is more 

 obviously deflexed and the margin is entire. In both examples the mandibular palp 

 appears to be missing. The specimens are perhaps immature ; but in T. southwelli 

 the palp is distinct, though not very clearly segmented, in individuals of a similar size. 



Brown mottling is visible on the dorsal surface of one of the preserved specimens 

 and forms decided patches in the middle of the last three thoracic somites. In this 

 individual also the basal segment of the exopod of the uropod is very dark brown except 

 for a pale postero-lateral triangular area. 



This species is closely allied to Odontodactylus havanensis, Bigelow(i894, p. 479), 

 the only known Atlantic representative of the genus. The form described by the 

 American author seems, however, to be distinguished by the following characters : — 



The rostrum is longer and has no median depression ; the greater part of the 

 ophthalmic somite is exposed in dorsal view ; the antennal scale is longer and the 

 basal part of the raptorial dactylus is strongly swollen and is not notched externally 

 at the base. 



0. havanensis is known from a single specimen, 20 mm. in length, found in 163 

 fathoms off Havana, Cuba. 



There are only two examples of Odontodactylus brevirostris in the Indian 

 Museum : — 



^ Andamans. 'Investigator.' 19,23 mm. 



7 -|y Andamans, 53 fathoms. ' Investigator.' 1 9 , 21 mm. 



This species has been previously recorded from the Pearl Banks, G. of Manaar 

 (Tattersall) , from the Seychelles in 34 fathoms (Borradaile) , and from Providence I., S. 

 of the Seychelles, in 19 fathoms (Miers). 



