31 



Conus (Leptoconus) convexus, sp. nov. 



[Plate II. Figs, oa-d.'] 



Protoconcli composed of two smooth turns, the initial portion of 

 ■which is lateral and immersed ; much elevated above the remainder 

 of the shell. The whorls of the spire, five in number, are slightly 

 convex, and are thus not excavated as in other species mentioned ; 

 they are ornamented by five or six deeply-cut sulci, somewhat 

 irregular in places owing to the intersection of growth marks ; 

 these latter, however, do not approach tessellation. The whorls 

 are not staged, but the suture is distinctly canaliculated, especially 

 as the growth approaches the ephebic stage. The body-whorl has 

 an elevated band at its periphery, which is rugosely lineated ; 

 its whole surface is covered by small, undulating, irregular sulci, 

 which broaden anteriorly and are interrupted by sinuous growth- 

 lines. Aperture long, narrow, its two margins parallel with 

 each other ; outer margin thin, curved, and distinctly crenulated 

 within ; anal sinus broad and comparatively shallow, inner margin 

 straight. 



Its protoconch is very different to that of C. pulhdescens ; and 

 the convexity of the whorls, deep sulci, canaliculate suture, and 

 crenulated margin of the aperture, are highly distinctive. On 

 comparison with C. complicatus, Tate, in addition to the characters 

 just mentioned, it will be observed that C. convexus is broader, 

 and the spire less elevated, whilst the ornament is peculiar to it ; 

 moreover, the whorls are not staged, neither is the sinus deeply, 

 arcuately notched. 



Dimensions (of the type specimen). — Length 17 mm.; breadth 

 9 mm. 



Form, and Loc. — Eocene : Meribee Plains, Victoria. 



70424. Two specimens. Purchased. 



Subgenus LITHOCOXUS, Morch. 

 [Cat. Yoldi, Fasc. i. 1832, p. 66.] 



Shell conical, spire more or less elevated, but often depressed, 

 not coronate nor staged ; body-whorl sharply carinate ; aperture 

 dilated in front, with a rather deep posterior sinus. 



Type. — Conus milkpunctatus, Linnxus. 



