328 



1903. Cuspidaria Dali, Trans. Wagner Free Inst. Sci. Philadelphia, III, p. 1503. 



1925. Cuspidaria Woodring, Miocène Mollusks from Bowden, Jamaica, Pelecypods etc., p. 90. 



1930. Cuspidaria Stewart, Spécial Publication Acad. Nat. Sci. Philadelphia, N" 3, p. 307. 



For a discussion of the validity of the names Neaera and Ctispidaria référence may be 

 made to Stewart, while the varions groups or subgenera of Cuspidaria hâve been fully 

 discussed by Smith and later by Dall. The génotype is Cuspidaria cuspidaria (Olivi). 



In the "Siboga" collection the subgenera represented are: — Ctispidaria, s. s., Cardiomya 

 Adams ^) — type Cuspidaria {Cardiomya) gouldiana Hinds, Rhinoclama Dall & Smith") — 

 type Cuspidaria {Rhinoclama') philippinensis (A. Adams) and Pseudoneaera Sturany ■') — type 

 Cuspidaria [Pseudoneaera) thazmiasia (Sturany). 



1. Cuspidaria {Cuspidaria) macrorhynchiis Smith. (Plate IX, fig. 17). 



1895. Cuspidaria inacrorhynchus Smith, Ann. Mag. Nat. Hist., (6), XVI, p. 12, pi. II, figs. 5, 5rt. 

 1897. Cuspidaria macrorhynchus Smith, Illustr. Zool. "Investigator", MolL, pi. III, figs. 5, 5 «■. 



Cuspidaria {Cuspidaria) macrorhynchus is, as Smith remarked, allied to C. wollastonii 

 Smith, but the shell of the latter is slightly more oblique, and the shorter rostrum is bisected 

 by a sharp keel. 



The "Siboga" shells agrée in gênerai form with the types of the species from the 

 Arabian Sea, but vary in référence to the length of rostrum. I figure two shells. 



Distribution: — The types of the species vvere collected at "Investigator" St. 177, off 

 the west coast of India. 



The "Siboga" shells were brought up in trawls at St. 102 (6° 4'.! N., 1 20° 44' E., 

 535 mètres) and St. 300 (10° 48'. 6 S., i23°23'.iE., 918 mètres). 



2. Ctispidaria {Ctispidaria) mitis sp. nov. (Plate VII, fig. 35). 



Ctispidaria {Ctispidaria) mitis is closely allied to C. {C.) macrorliynchus Smith, but the 

 new species has a much larger, more inflated and very globose shell. The umbones are more 

 tumid and project a great deal above the hinge-line. The rostrum is just about as long, but is 

 comparatively broader and the radiating ridge running from the umbones to the ventro-posterior 

 angle of the margin is better developed. The sculpture consists of almost regular, concentric, 

 thread-like striae, which on the rostrum curve up from the radial ridge, and form coarser rugae. 

 The shells are of a straw colour. 



Measurements of Holotype: — Length including rostrum 24.4 mm., height 12.Q mm., 

 diameter 10.6 mm., length of rostrum 11.4 mm., height of rostrum 4 mm. 



Habitat : — The Holotype and paratypes of this new species were brought up in a 

 deep-sea trawl at St. 18 (7° 28^2 S., 115° 24^.6 E., 1018 mètres). A single right valve was also 

 found at St. 17 (7° 28'. 5 S., ii5°28'E., 1060 mètres). 



i) Adams, A. — Ann. Mag. Nat. Hist., (3) XIH, p. 208 (1864). 



2) Dall, W. H. & Smith, E. A. in Dall, Bull. Mus. Comp. Zool. Harvard, XII, p. 300 (1886). With the authors of the subgenus, 

 I hâve given C. {R.) P/iilippitiensis (A. Adams^ as its type, but this species has never been described, and I hâve not seen any spécimens 

 of it. Rhinomya A. Adams is a synonym of Rhinoclama. 



3) Sturany, R. — Denkschr. Kais. Akad. Wiss. Wien, Math.-Nat., LXIX, p. 265 (1901). 



