38 
valves smooth. A line on the dorsal valve indicated that the 
loop is long ; length 1 inch; width 9 lines; depth 6 lines. 
In shape, this shell somewhat resembles young specimens of 
Terebratula intermedia , from which it differs by the form of the 
beak, etc. A specimen of this shell was found by myself, in the 
passage bed of the Lower Calcareous grit of Suffield Heights, 
near Scarborough. 
(9) Thecidcum triangulare, van. I have found several specimens 
of a small Thecideum attached to specimens of Waldheimia 
JTudlcstoni, and other shells in the passage bed of the Lower 
Calcareous grit of Suffield Heights. 
This shell appears to have a wide range. According to 
Davidson it occurs in the Lias and Inferior Oolite, and in the 
Coral rag. 
O 
( i 0) Waldheimia ornithocephala (Sowerby). Specimens of this 
species have been found in the Kelloway rock, in a railway 
cutting of the Hull and Barnsley Railway at Drewton, near 
Cave. These specimens are flat, and resemble those found at 
Kelloways, Wiltshire. They differ from the more convex 
variety, Waldheimia iimbonella, which occurs in the Kelloway 
rock of the Castle Hill, Scarborough, and in Cayton Bay, 
Yorkshire coast. 
(11) Waldheimia ohovata (Sowerby). Typical specimens of this 
species occur in the Cornbrash on the North side of Scarborough, 
and also in Cayton Bay. The Cornbrash of this district is a 
dark blue colour. 
Waldheimia ohovata var Siddingtonensis , Walker. An 
elongated, narrow variety; it occurs in the Cornbrash of 
Scarborough. It has been sometimes mistaken for W. digona. 
Waldheimia ohovata var Stiltonensis, Walker. This variety,, 
which occurs in the Cornbrash of Scarborough, has been 
confounded with Waldheimia hucculenta. 
(12) Rhynehonella suhtetrahedra, Davidson. In the York 
Museum there is a specimen of this species from the Scarborough 
Limestone, near Scarborough. 
(13) Waldheimia Strangwaysi, Walker and Buckman. A 
small ovoid shell found in the Dogger of the Peak, Yorkshire 
coast. 
(14) Terebratula clecipiens var , Chadwichi —Walker, and 
