TT. H. EucUeston—The Yorkshire Oolite. 57 



Oolite of Viel St.-Eemy. Quoted by De Loriol from the Sequanien 

 of Boulogne. The Yorkshire specimen is one of the very few 

 Univalves of the Lower Limestones, which are Oxfordian rather than 

 Corallian. Most of the Univalves in these beds are rather dwarfed. 



45. — Trochus aouticarina, Buvignier, 1852. Plate IIL Fig. 10. 



Troclms acuticarina, Buvignier, 1852, Stat. geol. de la Meuse, p. 38, pi. 25, figs. 



31 and 32. 

 Description. — Specimen from the Coral Eag of Yorkshire, probably 

 from the Howardian Hills (Leckenby Collection). 



Length 15 millimetres. 



Width 13 „ 



Spiral angle 56°. 



Shell conical, trochiform, but slightly oblique. Spire composed 

 of five or six whorls, which increase with great regularity and 

 without convexity. The posterior whorls of the specimen are so 

 far injured, that no detailed description can be given ; the same 

 remark applies to the base of the shell. Of those portions pre- 

 served, a most characteristic feature is a very prominent keel at the 

 base of each whorl ; this keel was probably serrated, but not deeply. 

 Below the keel the suture is not very strongly defined, but there is 

 a granulated line at the top of the succeeding whorl, followed by 

 faint transverse lines, which are slightly decussated by fine longi- 

 tudinal lines sloping from left to right. Thus the character of the 

 whorl may be described as flat with very shallow sculpture, sud- 

 denly curving upwards at the base into a very prominent keel. 



Relations and JDistribiition. — The specimen in the Leckenby Col- 

 lection is the only one known to have been found in Yorkshire. It 

 answers fairly to Buvignier's description of T. acuticarina, though 

 it must be admitted that the figures in the Stat. geol. de la Meuse 

 are not very like the one in the accompanying Plate (III. Pig. 10). 

 But the Yorkshii-e specimen is very imperfect and much involved in 

 matrix. Buvignier's species is said to be common in the Coral Eag 

 of the Meuse : it is not quoted from the Sequanien of Boulogne nor 

 by Brauns as occurring in North Germany. 



46. — Trochus granularis, sp.n. Plate IIL Figs. 11a, b. 

 Description. — Specimen from the Corallian of Yorkshire (Leckenby 

 Collection). 



Length 8 millimetres. 



Width 8 „ 



Spiral angle 64°. 



Shell conical, trochiform, nearly equilateral. Spire composed of 

 few whorls, which are perfectly flat, scarcely separated by suture, 

 and increase with great regularity. The ornaments consist of a 

 number of close-set transverse costse, which are conspicuously granu- 

 lated, the granulations being small, round and very equal. The 

 body-whorl has four rows of such granulated costse, of which the 

 lowest one is the most conspicuous, and is slightly grooved anteriorly. 

 This forms a prominent margin for the base of the shell, which is 

 nearly flat and marked by fine spiral lines, which decussate with 



