i86 Memoirs of the Indian Museum. [Voi,. IV, 



20. Gonodactylus glyptocercus, Wood-Mason. 



1875. Gonodactylus glyptocercus, Wood-Mason, Proc. As. Soc. Bengal, p. 232 ; reprinted in Ann 



Mag. Nat. Hist. (4), XVII, p. 263 (1876). 

 1880. Gonodactylus glyptocercus, Miers, Ann. Mag. Nat. Hist. (5), V, p. 122. 

 1886. Protosquilla cerebralis, Brooks, Voy. H.M.S. 'Challenger,' XVI, Stomatop., p. 72, pi. xiv, 



figs. 2, 3 ; pi. xvi, figs. 2,3. 



1886. Protosquilla glyptocerca, Brooks, ibid., p. 75. 



1887. Protosquilla cerebralis, de Man, Arch. f. Naturgesch., Uli, i, p. 575. 



1898. Protosquilla cerebralis. Borradaile, Proc. Zool. Soc, p. 33, pi. v, fig. 6a. 



1899. Protosquilla cerebralis, Borradaile, in Willey's Zool. Results, p. 399. 



1902. Protosquilla cerebralis, de Man, Abhandl. Senck. Ges. Frankfürt, XXV, p. 921. 

 1910. Protosquilla cerebralis, Fukuda, Annot. Zool. Japon., VII, p. 139. 



Gonodactylus glyptocercus is readily distinguished from its ally G. ectypus by the 

 peculiar sculpture on the telson and last two abdominal somites. 



The length of the carapace in the median line is more than one and a half times its 

 breadth at the subacute, but rounded, antero-lateral angles. The posterior margin is 

 slightly concave as are also the anterior edges on either side of the rostral base. The 

 rostrum is sharply trispinous. The median spine reaches to half the length of the 

 eyestalks, is fully three times as long as the basal undivided part, and is longer and more 

 slender than the forwardly curved lateral spines. 



The dorsal processes of the ophthalmic somite are similar in shape to those of 

 G. glaber. The eyes are cylindrical ; in large examples they are about one third the 

 median length of the carapace and reach a little beyond the middle of the second seg- 

 ment of the antennular peduncle. In dorso-lateral view the cornea is set almost trans- 

 versely on the stalk. 



The mandibular palp is composed of two segments. 



The basal part of the dactylus of the raptorial claw is strongly swollen ; the ex- 

 ternal margin is notched (sometimes very obscurely) in its proximal portion and the 

 inner edge is microscopically serrate. The lateral margins of the sixth and seventh 

 thoracic somites are rounded, the latter rather more broadly than the former. 



Except for the customary lateral L-shaped marginal ridge the first four abdominal 

 somites are entirely smooth. The poster o-lateral angles of the first two are rounded, 

 those of the third slightly more pointed, those of the fourth subacute. The dorsal 

 surface of the fifth somite is characteristically grooved. The grooves are very fine and 

 separated by broad and flat longitudinal ridges ; in large examples there are about 

 twenty-four in a transverse series, but a few of these bifurcate before reaching the 

 posterior margin. On either side of the middle line the grooves are parallel, but 

 laterally they run obliquely inwards and backwards. The postero-lateral angles are 

 bluntly pointed. 



On the sixth somite the customary elevations are obscure, and the whole surface is 

 finely grooved in a complicated/but symmetrical pattern, the details of which are well 

 shown in the figure given by Brooks (sub P. cerebralis). A peculiar C/3-shaped ridge 

 on either side near the anterior margin is perhaps worthy of special mention. The 

 postero-lateral angles are rounded. 



