VOL. xvn. (2) 



JURASSIC GERVILLI^ 



239 



Table I.— SPECIES OF GERVILl.IA FROM GLOUCESTERSHIRE 

 NOTICED IN THIS PAPER 



Name of Species 



Horizon or hemera 



Gervillia aurita Lycett 



G. baihonica Morris and Lycett 



G. bicostata Lye. 



G. compressa Whidborne 



G. coriniensis sp. nov. 



G. crassa J. Buckman 



G. crassicosta M. & L. 



G. jornicata Lye. 



G. Icevis J. Buekman 



G. lata Phillips 



G. monotis Eudes-Deslongehamps 



G. " ornaia " Lye. 



G. pralonga Lye. 



G. subcylindrica M. & L. 

 G. tortuosa (Sowerby) 



G. waltoni Lye. 



G. whidbornei nom. nov. 



bradfordensis. 



Great Oolite 



Great Oolite. 



bradfordensis. 



Forest Marble 



turneri or obtnsi, oxynoti 



Great Oolite 



variabilis and moorei 



striati-capricornus 



murchisoncB 



Great Oolite 



Great Oolite 



discitcB, post-discilcs, witchellicB and 



truellei. 

 Great Oolite 

 tnurchisoncs , concavi, discilce or ^05/- 



discitcB. 

 Great Oolite and Forest Marble. 

 variabilis, Pconcavi, discitee and post- 



discitcB 



So far, seventeen species belonging to Gervillia have been 

 recognised in Gloucestershire, one of which is new. Of these 

 seventeen species, the Lias has yielded four, the Inferior 

 OoUte six (one common to Lias and OoHte), and the Great 

 Oolite series eight. 



In order to secure the correct identification of the species 

 most of the type-specimens have been examined. Through 

 the courtesy of the curators, I have been permitted to borrow 

 the type-specimens of Gervillia from the Geological Survey 

 Museum, York Museum, Bath Museum, and the Sedgwick 

 Museum, Cambridge. In each case the types have been photo- 

 graphed and measured, and the matrix of the specimen care- 

 fully examined with a view to ascertaining the exact horizon 

 from which the specimen was obtained. Fortunately, many 

 of the types are from locahties in Gloucestershire, and are 

 preserved in matrices which have been readily identified by 

 Mr Richardson. 



A complete list of the species examined and the dates of 

 their existence are given on Table I., and both there and in the 

 following notes, the species are arranged alphabetically. 

 R2 



