Dr. LT. Woodward — On Fossil Shells, etc., from Sumatra. 499 



straight, longitudinally plaited, and spirally distantly sulcated, 

 interstices flat, aperture {broken in fossil) subquadrate, canal short, 

 outer lip produced in front of the canal below. (The outer lip of 

 the fossil shell is, however, broken.) Operculum not preserved — but 

 in living shell spiral, with the whorls fluted. 



Habitat : — This specimen is identical with the recent Pyrazus 

 palustris, of Linnaeus (see Reeve's Conchologia Iconica, vol. xv. genus 

 Pyrazus, May, 1865). A very common species found in salt-marshes 

 at the mouths of rivers, in the Eastern Archipelago, in Ceylon, in 

 North Australia, and other localities. 



Dimensions of fossil: — Height 4 inches; greatest breadth 1 J inches. 



Formation : — (Subfossil ?) 



Locality : — Government of the West Coast of Sumatra. 



48. Terebra subacuminata, H. Woodw. PI. XII. Fig. 12. 



Shell elongated, turriculated, very tapering, solid, with simple 

 closely-united and numerous whorls, only a little rounded, and with 

 but slightly indented sutures. Each whorl, . at a distance of one- 

 third of its breadth below the suture, is circumscribed by a single 

 indented line, or fold, 1 parallel to the suture, and equally as clearly 

 marked, which follows the course of the whorls of the shell from 

 the apex to the aperture. 



The shell is ornamented with numerous fine obliquely-curving 

 parallel raised lines, the curvature of which is reversed above the 

 indented line or fold. Aperture (broken) very small in proportion 

 to the shell, elongated and deeply emarginated at the base. 

 Columella simple, curved, with a single fold near the base. Nine 

 whorls of our Sumatran fossil only are preserved, giving a length 

 of 2^ inches. If the spire were restored, the length would have 

 been about 4 inches. 



This specimen approaches very closely to many recent forms of 

 Terebra, but it differs from each in some minor points of form, orna- 

 mentation, or growth. It presents considerable affinity to Terebra 

 duplicata, a species common to China and Singapore, but the costae 

 are much more strongly marked than in the fossil. Terebra 

 LamarcMi, from Zanzibar, may also be compared with it, but the 

 ornamentation in the living shell is too coarse. In Terebra sene- 

 galensis and in T. pertusa the parallel striae agree better with our 

 fossil, but in the former, the rate of increase of the shell is greater ; 

 whilst in the latter the ornamentation follows a different curve. 



Its nearest fossil analogue appears to be found in the Terebra 

 acuminata, Borson (Saggio di Oritt. Piem. Mem. della Accad. di 

 Torino, t. xxv. p. 224, t. 1, fig. 17; and Homes, Die Fossilen Mollus- 

 ken des Tertiaer-Beckens von Wien, 1856, Bd. i. p. 130, taf. 11, 

 figs. 22, 23, 24, a, b), but the cincture or fold is less distinct and 

 nearer to the suture than in M. Verbeek's specimen. The ornamental 

 lines or striae agree very nearly with T. acuminata. 



1 This indentation, or fold, reminds one of the similarly situated line or fold 

 marking the position of the filled up slit, or notch, near the suture in the lip of 

 Pleurotoma ; there is no slit in the lip of Terebra, but in the recent Terebra 

 duplicata the lip is slightly indented. 



