142 Memoirs of the Indian Museum. [Voy. IV, 
terior margin inside the lateral carina (this is perhaps omitted by error in 
Pocock’s figure). 
4. The telson is proportionately broader in O. /ativostris, and the movable tips of 
the submedian spines are shorter. 
. The terminal movable spine on the outer margin of the uropod fails to reach 
the apex of the ultimate segment. 
Ur 
In such important characters as the breadth of the eye, the form of the exposed 
dorsal processes of the ophthalmic somite and the details of the carination of the telson 
there appears to be the closest resemblance between the two forms. 
In O. lativostris the lateral margin of the seventh thoracic somite is rounded and is 
distinctly narrower than that of the sixth, which is truncate. ‘There are ten movable 
spines on the outer margin of the exopodite of the uropods. 
Borradaile records two specimens of this species, the largest 55 mm. in length, 
from the Amirante Is., in 25-30 fathoms. 
8. Odontodactylus southwelli, Kemp. 
Plate IX, figs. 103-106. 
1g1It. Odontodactylus southwelli, Kemp, Rec. Ind. Mus., VI, p. 94. 
This species is allied to the two preceding, but may be distinguished from them 
at a glance by the enormous size of the eyes. Its principal characters are as follows :— 
The rostrum is almost exactly twice as broad as long; its anterior margin is evenly 
rounded from side to side and is not depressed in the centre of its distal margin. The 
eyes (fig. 103) are enormously dilated, the breadth of the cornea being contained only 
from two to two and a quarter times in the median length of the carapace excluding 
the rostrum. A greater portion of the ophthalmic somite is exposed than in any of the 
allied species ; it bears dorsally a pair of strong anteriorly convergent ridges, and in 
the centre is very conspicuously excavated, the cavity so formed taking the shape of a 
deep and almost circular pit. The antennal scale is about four-fifths the median length 
of the carapace. 
The dactylus of the raptorial claw (fig. 104) is moderately dilated at the base and 
bears seven to nine well-defined teeth on its inner margin in addition to the terminal 
one. 
The lateral margins of the sixth and seventh thoracic somites are rounded, that 
of the sixth being a trifle broader and more broadly rounded than that of the seventh 
(fig. 105). A lateral depression confined by a pair of blunt carinae is visible on the 
fourth and fifth abdominal somites asin O. scyllarus and traces of a similar depression 
may be seen on the two preceding somites. The postero-lateral angles of the fourth 
and fifth somites are spinous. The arrangement of the carinae on the sixth abdominal 
somite is similar to that of the two preceding species (fig. 106). The submedian, second 
intermediate and lateral pairs of carinae terminate in spines; the first intermediates 
are connected proximally with the submedians, and the usual proximal denticle inside 
the laterals is well-marked. 
