88 PROCEEDINGS COTTESWOLD CLUB 1905 
5. TEREBRATULA MUTILATA, sp. nov. 
Pl. III, figs: 20—23. 
1878. TER. SPHAEROIDALIS VAR. ? WZDav. Supp. Brit. 
Oolitic and Liassic Brach. (Pal. Soc.), 
pl. xviii., fig. 15. 
DraGNosis.—Shell of medium size, pyriform, valves of about 
equal convexity -with a single rounded frontal fold. Beak 
truncated by fracture or abrasion during life and replaced 
by a shelly plate and small circular false foramen very 
slightly separated from the umbo. Deltidial plates entirely 
wanting. 
Dr Davidson, in his Supplement to his monograph, figures 
a globose Zerebratula from the “Oolitic Marl, Inferior 
Oolite, Crickley Hill.” I have three examples which some- 
what resemble the specimen figured, but are smaller. All 
my specimens are from the Oolite Marl, or Upper Free- 
stone, two of them from the Firth, near Stroud, and one 
from Crickley. Mr L. Richardson has shown me another 
specimen which he obtained at Leckhampton.’ 
A singular feature about two of my specimens, which is 
also shared by Mr Richardson’s, is that the beaks have the 
appearance of having been broken off during life, and the 
large orifice made by the fracture repaired by the addition 
of a plate of shelly matter perforated near the umbo for 
the protusion of the anchoring ligament. The other shell 
has unfortunately suffered from fost mortem: truncation of 
the beak, so that it cannot be determined with certainty if 
the apparent mutilation is a specific character, and I know 
of no other specimens. 
The discarding of portions of shell which have become 
useless to the inhabitant is a common feature among 
1 Referred to by Mr Richardson in his “Handbook” as “ 7. spherotdalis, var., 
Davidson,” p. 246. 
