Dr. H. Woodward — On Fossil Shells front Sumatra. 539 



Dimensions : — Height of shell 17^ millimetres ; greatest breadth 

 8 mm. ; length of aperture 8 mm. 



This shell approaches nearly to the Turbinella subcraticulata of 

 D'Orbigny, figured by Dr. Homes (in Die Fossilen Mollusken des 

 Tertiaer-Beckens von Wien, fol. 1856, Band I. p. 302, taf. 33, 

 figs. 10 a, h), — a species also found at St. Paul, near Dax. The 

 Sumatran shell has, however, a less acute spire than that from the 

 Vienna Basin ; the canal is straighter, the aperture smaller, and the 

 body -whorl less in proportion. The spiral lirations are also fewer. 



Formation and Locality : — The same as the preceding species. 



56. Pisania subdiscolor, H. Woodw. PL XIV. Fig. 6. 



Shell elongated, fusiform, apex sub-acute, whorls six in number, 

 spire delicately cancellated, body-whorl finely striated ; aperture 

 somewhat elliptical, one-half the entire length of shell, inner border 

 of outer lip canaliculate ; denticulated near the posterior extremity, 

 anterior canal slightly produced, and notched; columella smooth, 

 slightly thickened, with a small denticulation near the posterior 

 extremity of the aperture. 



Dimensions : — Height 10 mm. ; breadth 5 mm. 



Most of the species belonging to this genus are represented by 

 small shells which have very generally been confounded with 

 Buccinum, Murex, Bicinula, and Nassa. 



These shells have numerous indistinct varices, or are nearly 

 smooth and spirally striated ; the canal short, inner lip wrinkled, 

 outer lip crenated. 



Our Sumatran shell might easily be mistaken for a dwarfed form 

 of Pisania (Buccinum) discolor (Quoy and Gaimard, Voyage de 

 l'Astrolabe, 1832, Zoologie, tome ii. p. 422, pi. 30, figs. 23-25), 

 specimens of which in the British Museum are labelled as from the 

 " China Seas." On close inspection, however, the whorls are seen 

 to be more numerous, the apical ones being smaller and less mam- 

 millated in character. The last whorl is a trifle more constricted just 

 below the middle, and the basal canal is a little longer. The style of 

 sculpture and proportions of the whorls, however, are very similar. 



It may also be compared with the Pisania (Nassa) Andrei, Bast. 

 (1825), pi. iv. fig. 7, from the Miocene of Bordeaux. 



Formation : — Grey Tertiary Marl-clay. 



Locality : — Government of the West Coast of Sumatra. 



57. Banella ? tritonoides, H. Woodw. PI. XIV. Fig. 7. 



Shell subturrited, ventricose (lateral varices scarcely so continuous 

 as in most of the species referred to this genus, and for that reason 

 doubtfully placed under it) ; transversely lirate, lirae numerous, 

 three being more prominent than the rest, and becoming more dis- 

 tinctly marked as they pass over the costse ; longitudinally costated, 

 costa? prominent, body-whorl somewhat ventricose, aperture ovate, 

 dilated anteriorly, obliquely canaliculate, columella obscurely 

 biplicate. 



Neither of the two specimens of this shell have the mouth perfect. 



Formation and Locality : — With the preceding. 



