364 J. F. Walker — On Terehyatnlina suhstriata. 



distributing the debris throughout the Quaternary and the Eecent 

 deposits. The thin integument of soil that covers the surface even 

 in those localities where denudation has been the most severe, 

 masks from view the rocks beneath ; and this, combined with the 

 fact that but few clean cut sections of the Lower Coralline Limestone 

 are exposed inland, affords an explanation for the obscurity of these 

 thin veins of black limestone, and for the doubt with which their 

 occurrence in the Malta rocks has hitherto been regarded. 



VL — The Discovery of Terebratulina substriata, Schlotheim, 



IN Yorkshire. 



By John Francis Walker, M.A., F.G.S., etc. 



SEVERAL years ago Mr. W. H. Hudleston, Prof. J. F. Blake 

 and myself obtained large quantities of Waldheimia (Zeilleria) 

 Hnrllestoni, Walker, from the quarry on the SufSeld Heights near 

 Scarborough. I had separated several specimens which appeared to 

 differ from the typical form ; on rearranging my collection, I care- 

 fully examined them, and found that they were covered with fine 

 striae and also had the characteristic form of the genus TerebratnUna. 



The bed in which they occur is described b}' Hudleston and Blake, 

 Q.J.G.S. vol. xxxiii. p. 331. This quarry has been long noted for 

 the quantity of small sponges, Spongia floriceps, Spovgia corallina, 

 etc., which it contains. It is to be noticed that Quenstedt " die 

 Brachiopoden," p. 224. states that this brachiopod appears to prefer 

 exclusively a spongy layer as its dwelling place. Quenstedt, op. cit. 

 gives the following varieties of Terebratulina substriata, var. alba, from 

 Weiss Jura, 7, and var. silicea, var. marmorea from Weiss Jura, B. 



The Yorkshire specimens appear to be most like the variety 

 Terebratulina substriata, var. alba, but are generally less convex and 

 have the stria? finer and more numerous. If this shell should require 

 a varietal name it might be called var. Suffieldensis. 



As Mr. S. S. Buckman and myself are preparing a paper on the 

 species of Jurassic Brachiopoda which have been discovered since 

 Davidson's work was completed, I Avill not further discuss this 

 species. I have presented to the British Museum a specimen of 

 this Brachiopod. 



VII. — Eecent Observations on the Geology of the Lizard 



District, Cornwall. 



By Alexander Somervail, Esq. 



DURING a stay of nearly six weeks, made last July and August, 

 at the Lizard, Cornwall, I had ample opportunity of correcting 

 former, and making some fresh observations. 



With regard to the first of these, and to some of the strictures 

 recently passed on them, I found that I had little or nothing to 

 regret as to what I had ah-eady written on the subject, with the 

 exception of the "felsitic-like-rock" at Housel Cove,' which I should 

 now rather regard as a mass segregated, or separated out of the 



1 Geol. Mag. Vol. YI. 1889, p. IH. 



1 



