540 Dr. H. Woodward— On Fossil Shells from Sumatra. 



58. Borsonia granifera, H. Woodw. PI. XIV. Fig. 8. 



Shell fusiform or biconical ; spire conical, acute, sutures scarcely 

 marked, body-whorl equal in length to the spire, aperture narrow, 

 outer lip ridged, columella with one prominent fold, surface 

 ornamented with numerous transverse ridges distinctly granulated, 

 the two ridges near the suture being more prominent than the rest. 



Dimensions : — Height 15 mm. ; breadth 8 mm. 



This shell may be compared with species of the genus Conorbis 

 of Swainson, and particularly with G. dormitor, Solander, from the 

 M. Eocene, of Barton, Hants, etc. (Edwards, Eocene Moll, part iii. 

 1856, p. 200, tab. xxiv. fig. 11 a, b, e, Pal. Soc. Mon.), from which 

 it differs, however, in being more tumid and in the granulated 

 nature of its ornamentation. The prominent fold on the columella 

 is also wanting in that species. 



Formation and Locality : — Found with the preceding species. 



59. CeritMum VerbeeJcii, H. Woodw. PI. XIV. Fig. 9 a, b. 

 Shell turrited, volutions nine to ten in number, flattened ; suture 



distinct, each volution with about four rows of prominent transverse 

 tubercles separated by distinct striae ; granulated on the body-whorl, 

 tubercles arranged in regular rows ; aperture sub-rotund, outer lip 

 thickened, the inner margin very prominently crenated, inner lip 

 slightly arcuate, posterior canal well marked, anterior short and 

 oblique. 



Dimensions : — Height 20 mm. ; breadth 10 mm. 



This shell may be compared with the CeritMum Duboisii of 

 Homes, 1856 (Fossilen Mollusken des "Wiener Beckens, p. 899, taf. 

 42, figs. 4 and 5). It differs, however, from this Austrian species, 

 in being more robust in its spire, in the larger size of its body- 

 whorl, in the aperture not being inflated, and lastly in possessing a 

 thickened and prominently crenated outer lip. 



I dedicate this species to Mynheer Verbeek, the Director of the 

 Geological Survey of the Government of the West Coast of Sumatra, 

 whose careful researches have resulted in so large an addition being 

 made to our geological and palasontological knowledge of this 

 distant region of the earth. 



Formation and Locality : — Found with the preceding species. 



60. Pleurotoma (Glyplio stoma, Gabb) Jonesiana, H. Woodward. 

 PI. XIV. Fig. 10a, b. 



Shell subfusiform, spire elongate ; volutions somewhat convex, 

 longitudinally costated, costaa prominent, nearly straight and orna- 

 mented or crossed by from three to five transverse ridges or liras ; 

 suture distinct and depressed, ornamented or marked with curved 

 ridges, more numerous than the costas; aperture narrow, elongate, 

 outer lip thickened, and strongly denticulate, inner lip distinctly and 

 closely plicated ; canal slightly produced and recurved ; ornamentation 

 on body- whorl somewhat moniliform in consequence of the greater 

 prominence of the transverse striae as compared with the costae. 



Dimensions : — Height 22 mm. ; breadth 10 mm. 



This form presents a general resemblance to the Pleurotoma strom- 



