158 Rev. A. Irving — On the Permian and Tria^. 



costEe diminisli in size and strength from tlie proximal border till 

 they disappear near the hinder part of the axis about 4J lines from 

 the extremity, which is smooth, or nearly so. There are no spines 

 or other ornamentation on the surface of this specimen. 



This pygidium agrees most nearly in character with Homalonotiis 

 Knightii from the Upper Silurian (Ludlow Eock) ; but our specimen 

 is somewhat narrower in proportion to its length, and has more 

 numerous costfe than its Upper Silurian predecessor, to which how- 

 ever it is clearly related. From the angular form of the ribs and 

 the contour of the tail, this specimen may be named Homalonotus 

 goniopygmis. 



Formation and Locality — Middle or Lower Devonian, Smuggler's 

 Cove, Torquay. 



Collected by E. B. Tawney, Esq., M.A., F.G.S. 



The third and last specimen of Homalonotus (Fig. 2) is from the 

 collection of Mr. John Edward Lee, F.S.A., F.G.S., Villa Syracusa, 

 Torquay, and was obtained by him from the Meadsfoot Shale, Ord's 

 Bay, opposite the Thatcher. It affords evidence of the presence of 

 a species of Homalonotus, but is, I regret, too imperfect for specific 

 description. 



EXPLANATION OF PLATE IV. 



Fig. 1. Somalonotus ffoniopyffcBus, li.W. Smuggler's Cove, Torquay. 



,, 2. ,, sp. indet. Meadsfoot Beds, opposite the Thatcher. 



,, 3. ,, Champernownei ? H.W . Eed Beds, New Cut, Torquay. 



,, 4. & 5. Cypricardia Icevisulcus, Etheridge sp. nov. 



,, 6. Modiolop&is, sp.? 



,, 7. Rhynchonella laticosta? 



,, 8. Orthis hipparionix? 



,, 9. Spirifern ciiltrijugata, Eom. 



,, 10. Chonetes sordida. 



,, 11. Loxonema, sp. ? 



Figs. 3 — 11 are all from the Lower Devonian Eed Homalonotus Beds, New 

 Cut, Torquay, and are in the Collection of A. Champernowne, Esq., M.A., F.G.8. 



v.— On the Classification of the European Kocks known as 

 Pekmian and Trias. 

 By the Eev. A. Irving, B.Sc, B.A., F.G.S. ; 

 Senior Science Master of Wellington College. 



AS this subject has been a matter for considerable debate during 

 the past few years, and the British Committee of the Inter- 

 national Geological Congress have had the matter under their con- 

 sideration, it may be useful if I attempt to place before the readers 

 of the Geological Magazine the results of the investigations of our 

 sub-committee.^ As is well known, the term " Poikilitic " has been 

 proposed in some quarters as a comprehensive name for both series, 

 some writers advocating the view that they ought to be regarded as 

 one "system," as indeed they were of old under the name "New 

 Eed Sandstone." The palaeontological evidence, however, against 



1 It must be understood that the sub-committee is in no way collectively re- 

 sponsible for any of the statements made in this paper. 



