140 Memoirs of the Indian Museum. [Vol. IV, 



five times in the length of the carapace excluding the rostrum. The dorsal processes of 

 the ophthalmic somite are composed of two wing-like processes which meet and fuse an- 

 teriorly ; they are almost wholly exposed in dorsal view. The antennal scale is remark- 

 ably large ; its length is at least equal to that of the carapace excluding the rostrum. 



The dactylus of the raptorial claw is only slightly dilated at the base and the knife- 

 like edge on its inner margin is cut into from five to seven teeth. 



The exposed thoracic and first five abdominal somite closely resemble those of 

 0. scy liants, but the lateral depressions and ridges are practically obsolete-. The 

 postero-lateral angles of the fourth and fifth somites are rounded in the two large 

 specimens examined. The sixth abdominal somite bears a rather obscure median carina 

 and four others on either side. The lateral, outer intermediate and submedian carinae 

 end in spines in De Haan' s figure, but appear to have been worn away in the two large 

 specimens in the Indian Museum. Between the outer intermediates and the laterals in 

 the anterior part of the somite there is a prominent rounded tubercle. 



The arrangement of the carinae on the dorsal surface of the telson resembles that 

 shown in text-fig. 4, p. 12. The median carina is not high. The submedians are longi- 

 tudinally bisected and consist of a conspicuous inner and a less prominent outer ridge, 

 the latter being distinctly beaded. The intermediate carina is continued, though with 

 a slight interruption in the middle, to the apex of the submedian teeth. The first 

 lateral is obscure ; it passes close to the anterior end of the carina of the intermediate 

 marginal teeth, and trends inwards towards the base of the intermediate denticle. The 

 second lateral carina is sharp and is continued to the apex of the lateral marginal tooth. 

 Close to the anterior margin of the telson are two pairs of large tubercles, one placed 

 between the submedian and intermediate carinae, and one between the intermediate 

 and first lateral carinae ; the latter tubercle is sometimes obsolete. The marginal teeth 

 do not differ greatly from those of 0. scy Hams. 



The ventral process of the peduncular segment of the uropod is cut distally into 

 two broad teeth, the outer about twice the length of the inner ; each bears on its lower 

 surface a strong flat ridge. The basal segment of the exopod is about one and a third 

 times the length of the distal segment, and on its outer margin is provided with a series 

 of twelve or thirteen movable spines. These spines are flattened and blunt at the 

 apex ; the outermost reaches almost to the end of the distal segment. 



Iwo large specimens, pale yellow in spirit, are preserved in the Indian Musemn : — 



~ Hongkong. R. Hungerford. 1 c? , 142 mm. 



— ~ Misaki, Sagami Sea, Japan. A. Owston. 1 d , 158 mm. 



Odontodactylus japonicus was described by De Haan from Japan, and has since 

 been found in several localities in Japanese waters (Fukuda, Balss). It has been re- 

 corded from the Chinese Seas (Berthold, Miers) and from 55 fathoms on the Saya de 

 Malha Bank, S.E. of the Seychelles (Borradaile). 



6. Odontodactylus hanseni (Pocock). 



1893. Gonodaclylushansenii, Pocock, Ann. Mag. Nat. Hist. (6), XI, p. 477, pi. xx, B, figs. $-50. 



1894. Odontodactylus hanseni, Bigelow, Proc. U.S. Nat. Mus., XVII, p. 496. 



