498 Dr. S. Woodward — On Fossil Shells, etc., from Sumatra. 



terminal ones distinct, divaricating; aperture narrow, dorsal cicatrix 

 rather broad. 



My colleague, Mr. Edgar Smith, having compared this fossil shell 

 with the recent examples in the Collection, remarks : " Undoubtedly 

 this is the Cyprcea nucleus, Linn., whose geographical range extends 

 from the Mauritius to the Philippines, Borneo, and the islands of the 

 Pacific." 



Dimensions: — Length of shell 15 mm. ; breadth 9^ mm.; height 

 7 mm. 



Formation: — In bluish Clay-marl (Miocene?), Tertiary. 



Locality : — Island of Nias, Government of West Coast of Sumatra. 



45. Cyprosa erosa, Linn. PI. XIII. Fig. 10 a, b. 



Shell ovate-oblong, solid, somewhat depressed, colour (in living 

 specimens) golden-yellow on the back, scattered over very commonly 

 with minute white spots, more obscurely marked with a few chestnut 

 spots ; sides somewhat expanded and thickened, white at the 

 extremities, marked by reflexed chestnut bands, and close-set crenu- 

 lations; painted with a large dark-brown quadrate spot in the centre; 

 base somewhat flattened, white, sometimes marked by puncta and 

 converging lines of reddish chestnut. Aperture somewhat broad, 

 expanded in front, bluish within; dentations 14 to 19 in number, 

 short on the columella, prolonged on the lip ; lip at the marginal 

 terminations crenulated. 



There is no doubt about this species, although subject to great 

 variations. It occurs widely distributed, being recorded living from 

 the Mauritius, Mozambique, Ceylon, Seychelles, Andaman Islands, 

 North Australia, New Guinea, and several islands in the Pacific. 



Dimensions of Fossil : — Length of shell 31 mm.; breadth 20 mm.; 

 height 15 mm. 



Formation : — In light-coloured Clay-marl (Tertiary). 



Locality : — Government of West Coast of Sumatra. 



46. Bulla (Hydatina) crebristriata (cast), H. Woodw. PL XIII. 

 Pig. 9 a, b. 



The cast of this shell shows it to have been roundly oval, umbili- 

 cated, the spire retuse ; the surface closely and finely striated both 

 longitudinally and transversely. Aperture wide near the umbilicus, 

 and decreasing to one-half the width near the spire. 



Dimensions : — Height of shell 24 mm. ; greatest breadth 23 mm. 



The nearest analogue to our fossil is to be found in the Bulla 

 pay sis of Linnaeus from the Mauritius (see Sowerby's Thesaur. 

 Conch. 1855, vol. ii. p. 565, pi. cxx. fig. 9), but the aperture is 

 wider in the recent shell. B. physis is also similarly striated. 



It may also be compared with the Bulla vexillum, Chemnitz 

 (Sowerby, Thesaur. Conch, loc. cit. pi. cxx. figs. 12-14), from Ceylon. 

 Being a cast, however, it is difficult to relegate it to any existing 

 species. 



Formation : — In light-coloured Tertiary Clay-marl. 



Locality : — Government of the West Coast of Sumatra. 



47. Pyrazus palustris, Linn. PI. XIII. Pig. 11. 



Shell large, pyramidal (colour brown in living examples), whorls 



