144 Memoirs of the Indian Museum. [Vor. 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allied species is obsolete, and its position is indicated merely by a low smooth eminence.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 bifureate 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 (1894, 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. 
O. 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 :— 
3322 
oti) 
LT Andamans, 53 fathoms. ‘ Investigator.’ I9Q,2I mm. 
Andamans. ‘ Investigator.’ 19,23 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). 
