330 



Measurements (in millimètres). 



Right valve Left valve 



Length 21.6 19.8 



Height I 2.8 I 1.5 



Diameter 5 4.6 



Length of rostrum 5.3 4.3 



Depth of rostrum 4 3.8 



Habitat : — Two valves, a right and a left, on which the above description is based, 

 were dredged in the Bay of Bima (St. 47). I also refer to this species a young right valve dredged 

 at St. 105 (6°8'N., 121° 19' E., 275 mètres) and at Anchorage south coast of Timor (St. 285). 

 Remarks: — C. (C) corrugata is allied to C. (C) chinensis (Griffith & Pidgeon)^), but 

 the shell is not so rostrate, the umbones are less prominent and the sculpture is much less 

 developed and less regular. 



6. Cîispidaria {Cuspidaria) tonilini sp. nov. (Plate VII, figs. 40, 41). 



The following is a description of this new species : — Species of a médium size -, shell 

 ovoid, subequilateral, tumid, thick ; rounded in front, rostrate behind ; umbones acute, not very 

 prominent ; anterior dorsal margin convex, posterior dorsal concave, ventral margin arcuate, 

 curving up regularly behind middle to form ventral margin of rostrum -, rostrum about one third 

 total length of shell, shallow oblique dépression marking off rostrum from main part of shell, 

 with strongly developed oblique ridge from umbo to lovver angle of its edge, a second less 

 marked ridge from umbo to dorsal angle also présent; sculpture consisting of regular, concentric, 

 thread-like raised striae separated by broad interspaces, on rostrum below oblique ridge striae 

 compressed and irregular, above ridge appearing as low, closely placed transverse striae Shell 

 of a light yellowish brown colour, nacre dull white. 



Measurements of Holotype : — Length 9 mm., height 5.5 mm., diameter 4.5 mm., length 

 of rostrum 3.2 mm., depth of rostrum 1.8 mm. 



Habitat : — Two shells of this species, which I associate with the name of my friend 

 Mr J. R. Le B. Tomlin were dredged at St. 105 (6°8'N., 121° 19' E., 275 mètres). 



Remarks: — C. (C) tomlini is closely allied to C. (C) hindsiana A. Adams -), but 

 C. (C) tomlini has a much smaller and more tumid shell, the rostrum is comparatively longer 

 and bears two ridges ; the concentric striae of C. (C) tomlini are more regular and better developed. 



7. Cuspidaria {Cuspidaria) solidula sp nov. (Plate VII, fîgs. 42, 43). 



Cuspidaria {Cuspidaria) solidtila is closely allied to C. (C.) tomlini described above, 

 but the shell is more trigonal, deeper and more inflated ; there is a shorter rostrum separated 

 off by a more concave oblique dépression ; the umbones are more full and the sculpture 

 consists of very regular, closely placed concentric threads over the main part of the shell and 

 the depressed lower part of the rostrum ; above the ridge the threads are almost transverse. 



i) Griffith, E. & PiDGEON, E. — Kingdom, Animal MoUusca, p. 598, pi. XXII, fig. 5 (1834). 

 2) Adams, A. — .Ann. Mag. Nat. Hist., (3) XIII, p. 207 (iJ 



