382 Correspondence — Mr. Clement Reid. 



generall}'', yellowish shales, with remains of small Sanrians ; and 

 beneath these a mass, certainly more than a hundred feet thick, of 

 black carbonaceous shales, with occasional thin bands of coal. It is 

 found that the diamonds are more abundant and of better quality 

 when the level of the black shales is reached. It seems, therefore, 

 not improbable that the carbon requisite for the formation of dia- 

 monds was obtained from these shales. Some other points of minor 

 interest were also noted in this paper. 



6. " On a new Comatula from the Kelloway Rock." By P. H. 

 Carpenter, Esq., M.A., Assistant Master at Eton College. 



The specimen, to which the author's attention was called by E. 

 Etheridge, jun., Esq., is in the National Collection; he proposes for 

 it the name Actinometra ealloviensis. The specimen is from the 

 Kelloway rock, of Sutton Benger ; the whole diameter is 15 mm. ; 

 diameter of centrodorsal '6 mm. Three species of this genus are 

 already known from the British Jurassic rocks ; two are only known 

 from their centrodorsals, which are each different from that of A. 

 ealloviensis ; the third is A. cheltonensis, from the Inferior Oolite, 

 known only by its radials and basal s, which are different from those 

 of the present specimen. To this Antedon Picteti, from the Valangian 

 of the continent, has some resemblance. It is, however', a true Actino- 

 metra, differing chiefly from existing forms in retaining its primary 

 basals without their having undergone transformation into a rosette. 



7. '' Descriptive Catalogue of Ammonites from the Sherborne 

 District." By Sydney S. Buckman, Esq. 



In this paper the author gave a list of the Ammonites from the 

 Inferior Oolite of the neighbourhood of Sherborne, in which he 

 enumerated about 47 species, and stated that he had about 50 more 

 which appear to be undescribed ; fully one-half have the mouth- 

 termination perfectly preserved. The author indicated the zones 

 into which the rocks furnishing these Ammonites could be divided, 

 as shown at Oborne, near Sherborne, at Wyke Quarry, and at 

 Bradford Abbas, and indicated the characteristic fossils of each; 

 he also gave the principal synonyms of the species referred to, 

 and discussed some of their characteristic peculiarities. 



coI^I^:^]SI30Is^x):E^:^^o:E!. 



THE PLIOCENE BEDS NEAR CROMER. 



Sir, — I have read with much interest the address of my colleague, 

 Mr. Blake, of which an abstract was given in the Geol. Mag. for 

 June. There are, however, one or two points in it to which I must 

 take exception. Mr. Blake may be, and probably is, right in con- 

 sidering that the Weybourn Crag is the equivalent of the Chillesford 

 Clay, but I have avoided correlating them, for at present there does 

 not appear to be any satisfactory evidence either for or against this 

 view. The exact correlation of the different Pre-glacial soils is also 

 ■very unsafe, and near Cromer probably incorrect. 



With regard to the division between Pliocene and Pleistocene, 

 Mr. Blake bring-s forward no evidence for altering the line I have 



