268 Dr. F. R G. Reed— 



precise horizon of G. incurva Sow., of which this is the type locality. 

 An account of this section was published by Mr. L. Eichardson ia 

 1908.^ It is unnecessary to repeat the details given by him. 



That writer discovered several ammonites and concluded that the 

 zones from megastoma to semicostatus were present. Ammonites ^re 

 not now abundant at Fretherne, but it appears from recent observa- 

 tions that no beds lower than the biicMandi zone are present. Large 

 Arietid ammonites are found in the lowest reef on the foreshore 

 (No. 24 on Mr. Richardson's section). In the same bed the Gryphseas 

 are only slightly arched, with feeble sulcus and with fairly large 

 area of attachment. Gryphaeas in the succeeding beds (Nos. 20 

 and 18) show a more incurved left valve and are generally small. 

 Specimens that are scarcely distinguishable from G. incurva are 

 found occasionally in beds 15 and 13, but in the same bands are less, 

 coiled specimens. Large specimens resembling the holotype are 

 most abundant in bed 11. 



The precise horizon of this cannot easily be determined, but in 

 bed 9, some 5 feet higher, Arnioceras bodleyi is present, and 

 presumably the typical G. incurva occurs near the top of the hucldandi 

 zone at Fretherne. Fragments resembling Coroniceras gmuendense 

 were found just below bed 11, and it is certain that the type of 

 G. incurva is from the upper part of the gmuendense sub-zone or 

 a little higher. 



Notes on the Fauna of the Lower Devonian Beds of 



Torquay. 



By F. E. CowPER Eeed, Sc.D., F.G.S. 



(PLATE XII.) 



Part III : Mollusc a. 



Pterinea [Cornellites) costata Goldfuss. 



TN spite of Freeh's detailed work on the Devonian AviculidWy 

 -^ the application of the specific name costata to certain m.enibers 

 of the genus Pterinea. is even now a matter of some dispute, and 

 Drevermann ^ considers that Freeh ^ included under this name 

 some shells which properly belong to Pt. Pailletei De Vern. Walther ^ 

 and Fuchs ^ have more recently described the internal characters. 

 Williams ^ has chosen the species as the type of his new subgenus 

 Cornellites. 



The one fairly good example from the Torquay district with which 



^ L. Eichardson, " The Section of Ijower Lias at Hock Crib, Fretherne, 

 Glos." : Proc. Cvttes. Nat. F.C., vol. xvi, 2, 190S, T)p. 135-42. 



^ Drevermann, Palceontographica, Bd. L, 1904, p. 237. 



^ Freeh, " Devon. Aviculidae " : Abh. rjeol. spac. Kart. Preuss., Bd. ix, iii, 

 p. 71, t. viii, fig. 2 ; t. ix, fios. 4-8. 



* Walther, Neues Jahrb. f. min. Geol, Bail., Bd. xvii, 1903, p. 36. 



^ Fuchs, Abh. Icon, preuss. geol. Landesanst., N.F., Heft 79, 1915, p. 31, 

 t. viii, figs. 12-18. 



« Wilhams, Proc. U.S. Xat. Mas., vol. xxxiv, 1908, p. 89. 



