130 Memoirs of the Indian Museum. : [Vou. IV, 
The form of the articulation of the ischium and merus of the raptorial claw 
leads me to believe that the affinities of this genus are with Sguilla, Pseudosquilla, 
and Lysiosquilla rather than with Odontodactylus and Gonodactylus. 
Of the three known species one inhabits the Atlantic and two the Indo-Pacific. 
The Atlantic form, C. bradyi, is very closely allied to C. tvachura and the two may, 
in fact, belong to the same species; C. bradyi is only known from a single example 
described in 1869. C. multituberculata, though very different in general appearance, 
must certainly be accommodated in this genus. 
Key to the species of Coronida. 
I. Mandibular palp present ; external margin of raptorial dactylus with a 
single blunt lobe at base ; dorsal surface of last abdominal somite and 
telson covered with spinules ; form broad, greatest width of abdomen 
more than one-fifth of total length. 
A. Spinules simple, covering last abdominal somite and telson only ..  [brady?.] 
B. Spinules stellate, covering last abdominal somite and telson and, in 
addition, posterior half of fifth somite i oarig . trachura, p. 130. 
II. Mandibular palp absent ; external margin of raptorial dada with fhiie 
teeth; fifth abdominal somite smooth and unarmed; sixth with eight 
dorsal ridges ; telson with two median dorsal carinae and numerous 
large tubercles on either side ; form narrow, greatest breadth of abdo- 
men much less than one-fifth of total length multituberculata, p. 132. 
1. Coronida trachura (v. Martens). 
1881. Gonodactylus trachurus, v. Martens, Sitz.-ber. Ges. naturf. Freunde, Berlin, Pp- 93. 
1884. Gonodactylus trachurus, Miers, Proc. Zool. Soc., p. 16, pl. i, figs. 3, 3a. 
1886. Coronida trachura, Brooks, Voy. H.M.S. ‘ Challenger,’ XVI, Stomatop., pp. 7 and 97-80. 
1894. Odontodactylus trachurus, Bigelow, Proc. U.S. Nat. Mus., XVII, p. 496. 
1906. Coronida trachura, Nobili, Ann. Sci. Nat. Zool. (9), IV, p. 334. 
The carapace is smooth without trace of carinae and is widest posteriorly, its great- 
est breadth being about equal to its median length including the rostrum. The gastric 
grooves are well marked, and on either side of them faint traces of the transverse 
cervical groove may be observed. ‘The antero-lateral angles are angular but not pro- 
duced as spines, the postero-lateral are very broadly rounded. ‘The rostrum is sub- 
rectangular, much wider than long; its lateral margins are parallel, the antero-lateral 
angles almost rectangular, and the apex is formed by a blunt obtuse or subrectangular 
prominence. 
The eyes are about one-third the length of the carapace, excluding the rostrum. 
The cornea is prominently bilobed, set transversely on the stalk, and in breadth is 
rather less than the total length of the whole organ. The ophthalmic somite termi- 
nates in asmall acute apex. The antennular peduncle is a little shorter than the 
carapace excluding the rostrum. ‘The mandibular palp is three-segmented. 
The outer inferior margin of the merus of the raptorial claw is broadly rounded 
distally ; the carpus has a dorsal carina whichis cut into one or two sharp teeth near its 
distal end. The propodus bears three movable spines at the base of the margin opposed 
