the Coralline Oolites of the Neighbourhood of Oxford. 145 



gives a tolerably good idea of Phillips's species ; and it is com- 

 mon in the Bullingdon Coral Crag and the Islip Cornbrash — 

 two localities given by Lhwyd for his " Pholas amygdaloides." 



Soioerbya triangularis, Phil., sp. — I am not prepared to admit, 

 with my friend Dr. Lycett, that this species is the same shell as 

 the Isodonta Deshayesia of Buvignier, at least if any reliance is to 

 be placed on Prof. Phillips's figure. 



The anterior umbones and the shortly-truncate anterior ex- 

 tremity of S. triangularis readily distinguish it from the Soiverbya 

 {Isodonta) Deshayesia, a shell which is nearly equilateral. As the 

 English variety of /. Deshayesia differs slightly from the French 

 type; and as Prof. Phillips's figure of his "Cucullcea triangularis" 

 is not very characteristic, I give new figures of each of these 

 shells. 



Cypricardia isocardina, Buv. — M. Buvignier describes and 

 figures his shell as smooth ; but my only specimen, fortunately in 

 good preservation, shows a sculpture consisting of very strongly- 

 marked longitudinal stria? covering the whole surface of the 

 shell. The specimen figured is from the Coralline Oolite of 

 Bullingdon. Prof. Phillips informs me that it occurs in the 

 same stratum at Malton. 



Opis Phillipsii, Morris. — The Opis bicarinata of Buvignier is 

 very near to this species, and may perhaps be identical with it. 



Cylindrites Luidii, n. sp. — This shell was rudely figured by 

 Luidius (tab. 6. fig. 420) from the Coralline Oolite of Bessels- 

 leigb, where it is not uncommon: he calls it "cochlites cylin- 

 droides minor, turbine productiore." I have much pleasure in 

 dedicating this species to the memory of one of our earliest local 

 palaeontologists. 



Pleurotomaria, n. sp. (allied to PI. anglica, Sow.). — Probably 

 the shell alluded to by Sowerby, in the ' Mineral Conchology/ 

 under the head of Trochus {Pleurotomaria) similis, of which he 

 states that "the blue Lias of Weston, and in the neighbourhood 

 of Yeovil, Lackington Park, Shotover, &c, abound with this 

 Trochus." 



In the Coralline Oolite at Bullingdon I met with a single 

 example of this species, equal in size to Sowerby's type, and 

 certainly closely resembling it; but, owing to the hardness of 

 the matrix, I completely failed to extract it. 



Littorina Icevissima, n. sp. This shell has been figured in the 

 Supplement to Mr. Damon's f Geology of Weymouth ' (pi. 5. 

 fig. 6) as a Phasianella, but without any distinctive appellation. 

 I have had a series of specimens from the Coralline Oolite of 

 Besselsleigh for a long time in my cabinet, and, on the whole, 

 think that they should rather be referred to the genus Litto- 



Ann. ty Mag. N. Hist. Ser. 3. Vol. viii. 10 



