254 PROCEEDINGS COTTESWOLD CLUB 1911 



EXPLANATION OF PLATE XXIX. 



Figs. I a and ib. — Gervillia coriniensis sp. nov. 



la = left valve of holotype ; ib — hinge of left valve of holotypc, showing 



ligamentary grooves. 

 Hor. : Forest Marble. Bathonian. 

 Loc. : Near Cirencester. 

 Colin. : L. Richardson. 



Figs. 2«-c. — Gervillia waltoni Lycett 



External views of the syntypes (three left valves). 



Hoy. : Forest Marble. Bathonian. 



Loc. : Farley. 



Colin. : Sedgwick Museum, Cambridge. 



Fig. 3. — Gervillia monotis Eudcs-Deslongcharaps. 



E.xternal view of the left valve figured by Morris and Lycett, Monogr. 



Moll. Gt. Ool., tab. II, figs. 14a and 14b. 



Hor. : Great Oolite. Bathonian. 



Loc. : Minchinhampton Common, near Stroud. 



Colin. : Mus. Pract. Geol., Jermyn Street, London. [Reg. No. 9178]. 



Fig. 4. — Gervillia islipensis Lycett 



Left valve of holotype. 



Hor. : Stonesfield Slate. Bathonian. 



Loc. : Stonesfield, Oxfordshire. 



Colin. .Mus. Pract. Geol., Jermyn Street, London. [Reg. No. 9179]. 



Fig. 5. — Gervillia compressa Whidbome. 



Left valve of holotype. 



Hor. : Inferior Oolite. Aalenian. 



Loc. : Xailsworth, Gloucestershire. 



Colin. : Mus. Pract. Geol., Jermyn Street, London. [Reg. No. 886?]. 



Fig. 6. — Gervillia aurita Lycett 

 Left valve of holotype. 



Hor. : Inferior Oolite. Aalenian. 



Loc. : Xailsworth, Gloucestershire. 



Colin. : Mus. Pract. Geol., Jermyn Street, London. [Reg. No. 8862.] 



(All the figures are about natural size). 



