Correspondence — Mr. Clement Reid. 43 



The genei'al aspect of the calyx, the component plates of which were 

 described in detail, is exceedingly pentacrinoid, whether it is viewed 

 from the side or from above ; and the arm-joints are short and 

 nearly oblong in outline, having pinnules alternately upon opposite 

 sides. The nearest allies of Millericrinus Pratti are M. Nodotianus, 

 d'Orb., and the var. BucManiis of M. Munsterianus ; and of Penta- 

 crini the one which most resembles it in the characters of the 

 calyx is the North- Atlantic P. Wi/ville-Thomsoni. 



The remainder of the paper was devoted to the description of two 

 Jurassic Comatul83, namely, Antedon colloviensis, from the Kelloway 

 Rock, described before the Society on June 22, 18S1, and a new 

 species, Antedon latiradia, from the Great Oolite of Bradford. 



3. " Notes on the Polyzoa of the Wenlock Shales, "Wenlock Lime- 

 stone and Shales over the Wenlock Limestone. From material 

 supplied by G. Maw, Esq., F.L.S., P.G.S." By G. E. Vine, Esq. 

 Communicated by Dr. H. C. Sorby, F.R.S., V.P.G.S. 



The author has received from Mr. Maw about 1|- hundredweight 

 of materials washed out of the Wenlock deposits of Shropshire, 

 representing the contents of from 6 to 8 tons of unwashed material. 

 From this material he extracted the specimens of Plants, Actinozoa, 

 Echinodermata, Crustacea, and Polyzoa, and he gave a tabular 

 sjmopsis of the species and their distribution, with the addition of 

 types from the Wenlock Limestone and of the species of Brachiopoda 

 referred to in a paper by Messrs. Maw and Davidson in the Geo- 

 logical Magazine for 1881. 



With regard to the Polyzoa, the author remarked that below the 

 Cretaceous series the two great divisions of Cheilostomata and Cyclo- 

 stomata do not hold good, and suggested that the classification of 

 PalEeozoic Polyzoa should be based on the arrangement and character 

 of the cells in combination with habit. The forms characterized in 

 the present paper were : — Stomatnpora dissimilis, Vine, and vars. 

 elongata and compressa, Ascodiciyon stellatiim, Nich. & Eth., A. radi- 

 ciforme, sp.n., A. jilifornie, sp.n. ?, Spiropora regidaris, sp.n., 8. 

 intermedia, Vine, Diastopora consimilis, Lonsd., Ceriopora. Goldf, 

 Sornera crassa, Lonsd., ff. ? delicatula, sp.n., Polypora 1 prohlematica, 

 sp.n., Fenestella prisca, Lonsd., Glauconome disticha, Goldf., Ptilo- 

 dictya lanceolata, Lonsd., P. Lonsdalei, sp.n. ( ■= P. lanceolata, 

 auctt.), P. scalpellum, Lonsd., P. interporosa, Vine, and P. minuta, 

 Vine. 



coI^T^:Es:po3s^x):E]I5^o:E3. 



THE SUDDEN EXTINCTION OF THE MAMMOTH. 

 Sir, — In speaking of " the old and, I had hoped, extinct theory 

 of violent changes and the sudden extermination of a species," I 

 intended to have said extinct in England ; for no one acquainted with, 

 continental opinion would venture to call it extinct there, though, 

 at last foreign geologists are beginning to abandon such misleading 

 terms as "Diluvium" for the deposits known in this country as 

 Pleistocene. It may be from too exalted a view of the advances 



