332 



10. Cuspidaria [Cardiomya] singaporensis (Hinds). 



1843. Neaera Singaporensis Hinds, Proc. Zool. Soc. London, p. 'j']. 



1844. Neaera Singaporensis Hinds, Ann. Mag. Nat. Hist., (i) XIII, p. 308. 



1845. Neaera Singaporensis Catlow & Reeve, Conch. NomencL, p. 11. 

 1856. Neaera Singaporensis Adams, H. & A., Gen. Rec. MolL, II, p. 369. 

 1860. Neaera Singaporensis Reeve, Elem. Conch., II, p. 155. 



1876. Neaera singaporensis Tapparone-Canefri, Viag. "Magenta", p. 224. 

 1885. Neaera singaporensis Smith, "Challenger" Lamellibranchia, p, 36. 

 1890. Neaera Singaporensis Paetel, Cat. Conch. Samm., III, p. 28. 



1909. Neaera Singaporensis Lynge, D. Kgl. Dansk. Vidensk. Selsk. Skr. Nat. -Math., (7) V, 

 p. 288, textfig. p. 289. 



The hoUow radial ridges of C. {€.) singaporensis are broader than those of C. (C) 

 gouldiana^ and the rostral ridges are better developed. The umbones are more tumid, and are 

 curved inwards and backwards. 



Distribution ; — C. (C) singaporensis was described from Singapore and has also been 

 recorded from the Gulf of Siam. 



In the "Siboga" collection there are stray valves of this species from the Madura Strait (St. 2). 



11. Cuspidaria [Cardiomya) persculpta sp. nov. (Plate VII, fig. 44). 



Cuspidaria [Cardiomya) persculpta is very closely allied to C. [C.) alcocki Smith described 

 from the Bay of Bengal ^). The main distinguishing features of the new species are the less 

 globose shell, the narrower and more oblique rostrum and the sculpture consisting of 3 main 

 and a number of accessory radial keels on the posterior half of the shell. There are in addition 

 a large number of feebly developed keels on the anterior half of the shell. In this new species, 

 further, the concentric ridges are better developed, and as a resuit ail the radial keels are 

 feebly serrated. 



Measurements of Holotype : — Length 10 mm., height 6.5 mm., diameter 4.3 mm. 



Habitat : — The Holotype and two paratypes of this, species were brougth up in a 

 deep-sea trawl at St. 52 (9°3'.4S., ii9°56'.7E., 959 mètres). 



12. Cuspidaria [Cardiomya) multicarinata sp. nov. (Plate VII, figs. 45, 46). 



C. (C) multicarinata is closely allied to C. [C) persculpta and C. [C.) alcocki Smith, 

 but is easily distinguished by its smaller and more globose shell, and its very short rostrum. 

 There are 3 main hollow and several radial ridges on the posterior half of the shell and on 

 the rostrum. In addition there are a large number of radial ridges on the anterior half of the 

 shell, but thèse are not so raised as those of C [C.) persculpta ; the concentric sculpture is 

 also not so strongly developed. The shell is thicker and more solid than that of either C. [C.) 

 alcocki or C. (6".) persculpta. 



Measurements of Holotype: — Length 8.4mm., height 5.9mm., diameter 4.5 mm. 



Habitat: — The unique Holotype was dredged at St. 90 (i°i7'.5 N., 1 18°53' E., 281 mètres). 



i) Smith, E. A. — Ann. Mag. Nat. Hist., (6) XIV, p. 170, pi. V, fig. 8 (1894) and lllustr. Zool. "Investigator", Moll. pi. III, 

 fig. 6 (1897). 



