﻿CRETACEOUS BRACHIOPODA. 



25 



14. Terebratella truncata, Sow. Dav., Cret. Mon., PI. Ill, figs. 34 — 41. 



This species, or variety of T. Menardi, occurs in the Lower Greensand of Faringdon, 

 and was likewise found by Mr. Meyer at Guildford (Bargate Stone beds). A single 

 valve was obtained from the Perna-bed of Sevenoaks. 



15. Terebratella trifida, Meyer. Sup., PI. VIII, figs. 15, 16, 17. 



Terebratella? trifida, Meyer. The Geologist, vol. vii, p. 166, 1864; and Geol. 



Mag., vol. i, pi. xii, figs. 17—23, 1864. 



Spec. Char. Shell about as wide as long; hinge-line nearly straight or widely 

 obtuse. Dorsal valve semicircular, moderately convex, divided into three, five, or seven 

 parts or ribs ; the middle one, which is the largest, occupies the central division and 

 forms a wide elevated mesial fold ; the lateral ribs are smaller. Ventral valve much 

 deeper and more convex than the opposite one, similarly divided into two, four, or six 

 ribs, with a deep angular median sinus. The beak projects very little, sloping back- 

 wards, and truncated by a rather large circular foramen, partly completed by a deltidium 

 in two pieces ; beak-ridges sharply defined, leaving a flattened space or area between 

 them and the hinge-line. The surface of each valve is crossed by strongly marked, 

 almost equidistant, lines or ridges of growth. In the interior of the dorsal valve a small 

 longitudinal septum, originating from beneath the hinge-plate, extends to about one 

 third of the length of the valve. Loop doubly attached, resembling that of T. Menardi. 

 Length 5, width 5 lines. 



Obs. This species has been well described and illustrated by Mr. Meyer, who 

 observes that, while approaching most nearly to T. Menardi, it is, however, readily distin- 

 guished by its very large and simple mesial fold and sinus. 



Position and Locality. T. trifida occurs in the Bargate Stone beds (Aptian) near 

 Tewsley, south of Godalming, and at a quarter of a mile west of St. Katherine Hill, near 

 Guildford. In both localities the shell appears to be rather uncommon. 



16. Terebratella pectita, Soto. Dav., Cret. Mon., PI. Ill, figs. 29 — 33. 



It is abundant in the Upper Greensand of Warminster, and was found by Mr. Meyer 

 in Chloritic beds near Beer Head, also at Swanage Bay, Dorset. 



4 



