282 



Records of the Indian Museum. 



[Voi,. XXIV, 



Miers,' who refers to a dried and imperfect specimen obtained in 

 this mollusc at Keppel I., Port Curtis, Queensland. 



Conchodytcs nipponensis (de Haan). 



Pontonia nipponensis, de Haan, in Siebold's Fauna jfaponica, 



Crust., p. 180, pi. xlvi, fig. 8 (Hymenocera niponensis on plate). 

 Pontonia nipponensis, Balss, Abhandl. math.-phys. Kl. K. 



bayer. Akad. Wiss., Suppl. Bd. II, p. 53, fig. 33. 

 Pontonia nipponensis Borradaile, Trans. Linn. Soc. (2) Zool. 



XVII, p. 391. 

 Conchodytes nipponensis, Parisi, Atti Soc. ital. Sci. nat. I.VIll, 



p. 75, text-figs. 5, 6. 



The principal characteristics of this species are the following : — 

 (i) The rostrum is sharply pointed in dorsal view ; it falls short 



of the apex of the antennal scale, reaching to the base or middle of 



the second segment of the antennular peduncle. 



(ii) The outer margin of the basal segment of the antennular 



peduncle terminates in an acute point. 



1849. 

 1914. 

 1917. 

 1919. 



Text-fig. 104. — Conchodytes nipponensis (de Haan). 



a. Third maxilliped. c. Dactylus of third peraeopod. 



b. Fingers of second peraeopod. d. Telson. 



(iii) The antepenultimate segment of the third maxilliped 

 (text-fig. 104a) is comparatively narrow ; its greatest breadth is less 

 than twice its length and at the distal end it is not much wider 

 than the penultimate segment. The penultimate segment is about 

 i - 6 times as long as wide and is equal in length with the ultimate. 



(iv) The carpus of the first peraeopods is equal to or slightly 

 longer than the merus. 



(v) In the single specimen examined there is a large tooth, 

 which is apically serrate, in the proximal half of the dactylus 

 (text-fig. 1046) and, in front of it, another tooth, 1 much lower but 

 more sharply pointed. There are two teeth on the fixed finger, 



1 Miers, Zool. Coll. H. M. S. 'Alert,' p. 291 (1884). 



2 Parisi in his description states that there is only one dactylar tooth. 



