KEMP—PELAGIC CRUSTACEA DECAPODA 63 
angles are sharply acute, and in dorsal view a small but distinct branchiostegal spine is 
visible. The distance between the gastro-hepatic and cervical grooves, measured dorsally, 
is about one-quarter the distance from the latter groove to the posterior margin of the 
carapace. 
The antennal scale appears to have been very strongly narrowed distally : its tips 
are broken. The second segment of the antennular peduncle is long ; seen in lateral view 
its dorsal measurement is more than three-quarters that of the ultimate segment. 
_ The second segment of the mandibular palp is, in length, just equal to the greatest 
width of the basal segment. The internal lobes of the second maxilla are widely sepa- 
rated from one another, but the anterior lobe of the internal lacinia is not wider at the 
apex than at the base as in Gennadas precox and G. calman. The posterior lobe of the 
external lacinia is about one and a half times as wide as the adjacent lobe of the internal 
lacinia. At its base the slender apex of the endopod bears on its external aspect two 
curved spines. The basal segment of the endopod of the first maxillipede is furnished 
with three spines ; the third segment is about one and a quarter times the length of the 
second. 
In the first pair of pereeopods the carpus is about equal in length to the chela and 
the dactylus is shorter than the palm. In the second pair the chela is a trifle shorter than 
the carpus and is a little more than two-thirds the length of the merus. The last three 
pairs of legs are missing and the tip of the telson is broken off. 
The thelycum is an elaborate structure quite unlike any which have hitherto been 
observed. Fig. 9 will convey a better idea of its appearance than a long description. 
The large cordiform plate between the legs of the last pair is free and unattached to the 
sternum in its anterior third. 
The female on which the above description is based represents, I believe, a species 
hitherto undescribed. If I am right in my supposition that the undescribed females in 
Mr Gardiner’s and in the “Investigator” collections belong respectively to Gennadas 
parvus and to G. sordidus, the only species known from the Indian Ocean of which the 
female remains unrecognised is G'. precox, and it seems clear from the very different shape 
of the lobes of the second maxilla that the present specimen cannot be assigned to that 
form. From male Gennadas parvus and G. sordidus it may be distinguished by the 
comparatively greater length of the second segment of the antennular peduncle. 
Two female specimens from the vicinity of Farquhar Island, 1000 to 0 fms., seem 
to belong to the same species as that described above; but they are very badly 
mutilated. 
Tribe CARIDEA. 
Family Hoplophoride. 
HoptopHorus, H. Milne Edwards. 
10. Hoplophorus gracilirostris, A. Milne Edwards. 
Hophorus gracilirostris, A. Milne Edwards (Oplophorus), Ann. Sci. Nat. Zool. (Sér. 6), xi. 1881, art. 4, p. 6 
and Recueil figs. Crust. nouv. ou peu connus, 1883, pl. 29; Alcock, Desc. Cat. Indian deep-sea Crust. Macrura 
and Anomala, 1901, p. 73. 
