Vol. 59.] A LOWER-GREENSAND FOSSILIFEROUS BAND. 253 



1874. Terebratula ovata, Davidson, 'Brit. Cret. Bracliiop.' Suppl. Monogr. Pal. 



Soc. p. 32 & pi. ii, fig. 14. 

 1900. Terebratula ovata, Jukes-Browne, ' Gault & Upper Greenland of England ' 



Mem. Geol. Surv. p. 65, fig-. 40. 



We have collected a few shells from Shenley which appear to 

 belong to this species. They have the lateral and frontal margins 

 sharper than the Warminster specimens, but do not differ from 

 them more than this species varies in that locality. Terebratula 

 ovata was well described and figured by Davidson ; but unfortunately 

 Sowerby figured a young specimen which does not show the 

 characters of this species, and is one of the many instances in 

 which the specimen first figured, the so-called ' type,' is not typical of 

 the species. 



The dimensions of a Shenley specimen are as follows : — length = 

 20 millimetres ; breadth = 17 mm. ; thickness = 9 mm. ; and the 

 apical angle = 90°. 



T. ovata occurs in the Upper Greensand of Warminster and the 

 Isle of Wight; in the Cenomanian of Devon, Somerset, and Dorset ; 

 and in France, in the Cenomanian near Havre. 



Terebratulina triangularis, Etheridge. (PI. XVII, fig. 7.) 



1868. Terebratulina, rlgkla, Schloenbach, in Benecke's Geogn.-Palaont. Beitrage, 



vol. i, p. 455. 

 1874. Terebratulina rigida, Davidson, ' Brit. Cret. Brachiop.' Suppl. Monogr. 



Pal. Soc. p. 32. 

 1881. Terebratulina striata, var. triangularis, Etheridge, Mem. Geol. Surv. 



' Geol. of Neighb. of Cambridge ' p. 148 & pi. iii, fig. 15. 

 1884. Terebratulina triangularis, Davidson, 'Brit. Cret. Bracliiop.' App. to 



Suppl. (vol. v) Monogr. Pal. Soc. p. 245 & pi. xviii, fig. 3. 



We have found at Shenley a few specimens of a small Terebratu- 

 lina, which appear to resemble closely the form that occurs in 

 the Greensand of Cambridge, and in the Red Chalk of Hunstanton 

 and Speeton. It is also found in the Tourtia of Essen, and the 

 Cenomanian of Havre (France). It appears doubtful whether 

 this species is Sowerby's T. rigida, which was found in the Chalk 

 near Norwich; but, as we are informed that a monograph is being- 

 prepared on the Terebratulince of Europe by Dr. Kitchin, we will 

 not further discuss the synonymy of this species. 



Dimensions: — length = 6-5 millimetres; breadth = 5*25 mm.; 

 thickness = 2-5 mm. ; and the apical angle = 66°. 



Zeilleela convexiformis, nobis. (PI. XVII, figs. 8 a-S c.) 



Shell ovoid, globose, longer than wide ; valves almost equally 

 convex ; greatest thickness about one-third from the posterior end ; 

 lateral margins regularly curved ; front-margin rounded. Shell- 

 surface smooth, showing concentric lines of growth. Larger valve 

 convex, especially towards the beak, which is short, incurved, and 

 truncated by a medium-sized foramen ; beak-ridges concave ; del- 

 tidium shallow, in two pieces ; hinge- line curved. Smaller valve 

 convex, the greatest convexity being about one-third of the shell ; 

 a dark line shows the presence of a median septum, hence the shell 

 had a long loop. 



