544 PROCEEDIIs^GS OP THE GEOLOGICAL SOCIETY. 



rounded or convex, and slightly angulated on their upper margins. 

 Surface of the shell smooth and without ornamentation ; mouth only 

 partly exposed, exhibiting on its inner margin a thick reflected lip. 

 I have hitherto found only a single specimen, which is from the 

 Liassic vein in the Carboniferous Limestone at Holwell. 



23. Delphinula eeelexilabeum, Home. PI. XYII. figs. 8, 9. 



Shell small, discoidal, truncate ; spire depressed ; apex obtuse ; 

 body-whorl smooth, slightly depressed on the under surface, very 

 rounded and convex on the margin ; aperture very large, circular, 

 and surrounded by a very wide reflected lip. Umbilicus and base 

 not exposed. 



This shell appears to have some affinity to Rotella macrostoma, 

 Stol., which that author states to be common on the Hierlatz, but 

 which he separates from the above, from its not possessing the 

 reflected lip, which, in our specimen, acquires nearly one-third of 

 the width of the last whorl. 



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



24. Ambeeleya alpinus. PI. XYII. fig. 7. 

 Eucydus alpinus, Stoliczka. 



Shell turreted ; of 4-5 rounded volutions, which are divided by 

 a deep angular suture. Each whorl possesses three or four tuber- 

 culated carinse, and in the basal angle another somewhat smoother. 

 The base of the body-whorl has many encircling striae. The mouth 

 is large, somewhat square ; outer hp thin, but thickening at the base, 

 where it is slightly reflected. My examples of this shell are not in 

 good condition, though sufficiently so to mark the species. The 

 figure is a restoration after Dr. Stoliczka' s. 



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



25. Ptjsijs Teeqtjemi, spec, no v. PI. XIY. fig. 8. 

 Pteroceras"^ Terq. 



Shell rather small, fusiform ; spire produced ; volutions 6-7, 

 angulated ; surface ornamented with fine concentric strite, which 

 continue to the base of the columella, and with elevated costae 

 which cross the angulated base of the whorls ; aperture longitudinally 

 ovate ; columella extended, slightly folded, with narrow canal. 



M. Terquem, in his account of the geology of Luxembourg and 

 Hettange, has referred this shell with some doubt to Pteroceras, but 

 states his example to have been imperfect. 



As my specimens show the columella, and are otherwise complete, 

 there can be no doubt that they belong to Fusus, though the genus 

 has not been recognized so low. I name it in honour of M. Terquem, 

 whose work on the Lower Lias has greatly assisted me in gaining 

 my knowledge of the pala3ontology of that formation. 



Loc. The coralliferous conglomerate of Brocastle, where it is not 

 uncommon, though rarely perfect. 



