256 F. R. Con-per Reed — Salter's Undescribed Species. 



exclusively of Tertiary beds in all England. It was originally 

 represented by tbe Geological Survey as being beld up in a forked 

 fault witb a sort of repetition of tlie London Clay at its nortbern 

 base. There certainly seems no justification for tbe introduction 

 of the London Clay into this position, viz. the nortbern base of tbe 

 hill. There may, however, be some better reason for the introduction 

 of a fault, for it is just hereabouts that the junction of the Creech- 

 barrow Beds with the Pipeclay series takes place. This is a piece 

 of stratigraphy which I have not yet succeeded in solving to my 

 own satisfaction, though such a question has only an indirect bearing 

 on the origin of Creechbarrow as a hill. I am far from saying 

 that everything in connection with its origin has been explained, 

 but without doubt one great predisposing cause is tbe protection 

 which tbe softer strata have received from the concretionary lime- 

 stone. Such protection is not only accountable, in a great measure, 

 for the existence of the hill itself, but also for its present shape, 

 which has to a considerable extent been determined by the original 

 form of the calcareous body that accumulated in some old Tertiary 

 lakelet, ages before the uplift of the Purbeck Hills. 



II. — WOODWARDIAN MuSEUM NoTES : SaLTER's UnDESCRIBED 



Species. VIII. ^ 



By F. R. CowPER Reed, M.A., F.G.S. 



(PLATE XVI.) 



LAMELLIBRANCHIATA (Continued) . 



GoNioPiioRA GRANDis, Salter. (PI. XVI, Figs. 1, 2.) 



1873. Gouiophora f/rancUs, Salter: Cat. Camb. Sil. Foss. Woodw. Mus., p. 151 



(« 827). 

 1891. Goniophora grandiH, Woods: Cat. Type Foss. Woodw. Mus., p. 77. 



There is only the one poorly preserved and imperfect specimen 

 in the Woodwardian Museum on which Salter founded this species. 

 It comes from the Wenlock Limestone of Dudley and belongs to 

 tbe Fletcher Collection. Salter says of it (a 827) : " Strongly 

 costated and marked with lines of growth which decussate the 

 ribs. Twice tbe size of the common Ludlow species." The material 

 is so poor that the specific description must necessarily be incomplete. 



Diagnosis. — Shell narrow, transversely elongate, dorso-ventrally 

 compressed. Valves very deep, angulated by diagonal, very strong 

 carina from beak to posterior angle. Anterior side with large deep 

 subcordate lunule. Below the diagonal carina the surface of the 

 valves is marked by about twelve strong radiating rounded ribs, 

 curved slightly forwards, parallel to the margins of the lunule and 

 crossed by numerous concentric growth-ridges. Above tbe carina 

 tbe sole ornamentation is the continuation of this series of concentric 

 ridges, the radiating ribs being entirely absent. 



Measurement. — Length (diagonal, along carina) approximately 

 45-50 mm. 



1 For previous articles see Geol. Mag., 1901, pp. 5, 106, 246, 355, and 576 ; 

 1902, pp. 122 and 145. 



