554 PEOCEEDINGS OP THE GEOLOGICAL SOCIETY. 



This little shell is rare, and has only been found in the Lower Lias 

 of Langan. It is readily distinguished from T. Deslongchampsii 

 by its more convex volutions and its more obtuse carinse, which 

 become obsolete on the upper whorls. The beds of Langan, whence 

 it comes, are on the same horizon as those of Southerndown. 



61. Tkochus Holwellensis, spec. nov. PI. XYII. figs. 1, 2. 



Shell turreted, conical ; apex acute ; spire extended, composed of 

 ten angulated volutions ; surface of the whorls ornamented by ele- 

 vated oblique costse, which are largest at the base of each whorl, 

 and are continued upwards on its angulated surface ; the costae are 

 decussated by three encircling striae, which give the former a slightly 

 nodulated character. The costae at the base of each whorl are ex- 

 panded, forming a carina over the succeeding whorl, the edge being 

 fringed by prominent bosses from the termination of the costae. 

 Aperture not exposed. 



This pretty species is very rare. I possess but two specimens, 

 which are from the Liassic vein in Carboniferous Limestone at Hol- 

 well. 



62. Teochus latilabeijs? Stol. PL XYII. fig. 11. 



Shell turbinated, inflated, depressed ; volutions 4-5, conical, sepa- 

 rated by a slight sulcation, the body-whorl increasing rapidly and 

 much enlarged. The upper whorls are covered by encircling striae, 

 which by aid of the lens are seen to be very finely granulated. On 

 the body-whorl of the only example I possess the striae become 

 almost obsolete. The base and mouth are not visible ; the former 

 is stated by Dr. Stoliczka to possess spiral furrows, and the inner 

 portion of the lip to be a little thickened. 



Log. The Liassic vein in the Carboniferous Limestone at Holwell. 



63. Teochtjs Eliz^, Moore. PL XYI. figs. 16, 17. 



SheU conical ; spire elevated ; whorls six, rather convex ; sutures 

 slightly angulated ; surface ornamented by four or five regular 

 transverse striae, which are decussated by faint longitudinal striae, 

 giving the shell a generally reticulated appearance ; base discoidal, 

 slightly convex ; aperture oblique, small ; columella small, slightly 

 folded. 



It is from the Liassic conglomerate of Brocastle. 



64. Ttjebo solidus, spec. nov. PI. XYII. fig. 18. 



Shell conical, rather thick ; volutions 5 ; base of the whorls some- 

 what acute, above which they are angulated to the suture. Surface 

 of the shell smooth, with very faint curved lines of growth on the 

 last whorl. Aperture not exposed. 



This shell is from the Liassic fissure in the Carboniferous Lime- 

 stone at Holwell. 



