R. Bullen Newton — Fossils from Singapore. 489 



them from the sbale and sandstone of Upper Sarawak and Santubong " 

 [Borneo].^ 



Description of the Fossils. 



The matrix containing the fossils is a light drab-coloured compact 

 clay, varying slightly in tint and particularly soft to the touch, 

 marking everything as if it were chalk, although according to the 

 acid test no calcareous constituents are present. Dr. G. T. Prior, 

 of the British Museum, who has examined the material, has detected 

 some minute particles of silica entering into its structure. 



The specimens herewith described and figured have been mainly 

 collected by Mr. John B. Scrivenor, although a second series from 

 the same locality and beds was subsequently furnished to the 

 writer by Dr. R. Hanitsch, of the Raffles Museum, Singapore, three 

 of which are represented on the Plate by Figs. 3, 4, and 17. 

 Through the good services of both Mr. Scrivenor and Dr. Hanitsch 

 the specimens selected for illustration have been presented to the 

 British Museum. A word of praise should be extended to the 

 artist, Mr. A. H. Searle, for the excellent drawings he has constructed 

 from obscure and difficult material, and which, thanks to the 

 collotype process, have been satisfactorily reproduced on the Plate. 



LAMELLTBRANCHIA. 



CuouLLiEA ScRivENORi, sp. nov. (PI. XXV, Fig. 13.) 



• Shell small, compressed, inaequilateral, subquadrate, oblique ; 

 umbo very anterior ; dorsal margin horizontal, short ; anterior 

 area short, deep, obliquely and roundly truncated ; posterior region 

 wide, produced, rounded, and bearing an elongate oblique depression, 

 with an angulation at the posterior end of the hinge-line ; ventral 

 margin nearly parallel with dorsal line ; ornamentation consisting 

 of extremely fine concentric growth-lines crossed by a series of 

 delicate radial striations. 



Dimensions. — Length 13, height 7 mm. 



The specimen refen-ed to this form is a small, rather compressed 

 right valve, embedded in the rock, and, like the other specimens from 

 this locality, only showing external characters. It appears to differ 

 from previously described forms of this genus by its very ingequi- 

 lateral character, the umbo being within a small distance of the 

 anterior margin, and the relatively long and narrow posterior 

 depression. The sculpture markings are obscure, but when properly 

 shaded the valve shows decussating striations. 



Collector. — Mr. J. B. Scrivenor. 



* These Borneo Beds have been examined and reported upon by Mr. John B. 

 Scrivenor, and the results issued in a Government paper (No. 8) published at Kuala 

 Liimpur by the Geological Department of the Federated Malay States on the 

 19th January, 1905, entitled "A Eeport on the Geology of the Residency of 

 Sarawak, and of the Sadong District, Borneo, with special reference to the occurrence 

 of Gold and Coal." 



