252 Meyer — Lower Greensand Brachiopods. 
than a variety of Terebratula Moutoniana, D’Orb., a species which 
has been recently added to our list of Cretaceous Brachiopoda by 
Mr. E. R. Lankester (‘ Geologist,’ vol. vi. p. 314). The lowest 
layers of the pebble-bed at Tewsley also afford examples of two 
elongated species of Brachiopoda, one of which is an undescribed 
form of Terebratula, for which, for want of a better designation, I 
propose the name of 7’. eatensa ; the other I am inclined to consider 
as probably identical with 7’. Boubei, D’Arch. (Mém. 8. G. Fr. ii., 
pl. 19, fig. 11. The first of these species requires a short descrip- 
tion. 
3. TEREBRATULA EXTENSA, Spec. nov. Pl. XII, figs. 1-4. 
Shell unequally oblong-ovate, square in front, somewhat pointed 
towards the beak.. Valves unequally convex, smooth, without either 
mesial fold or sinus; showing only a few, concentric lines of growth. 
Ventral valve much the deepest and curved upwards in front. 
Dorsal valve flattened and slightly elevated in front, much depressed 
at the sides, and inflated near the hinge-line. Most of my specimens 
show also on the dorsal valve a central, longitudinal depression (see 
Pl. XIL, fig. 3), which, commencing near the hinge, extends to 
about the centre of the valve.* Beak short, very slightly recurved, 
and abruptly truncated by a large circular foramen, which is formed 
chiefly from the beak, and completed by the deltidial plates. Delti- 
dium in two pieces, wide, but extremely shallow (see Pl. XII, fig. 4), 
and almost hidden by the (apparent) encroachment of the smaller 
valve upon the hinge-area; beak-ridges but little defined ; margin 
of the valves flexuous. Shell-structure minutely punctuate. Loop 
short and simple. 
Dimensions.—The two largest of my specimens measure :— 
Length 13, width 7, depth 6 lines. 
ssWeirelilie wadeah ads ue ay aeos wines: 
Approaching to T. prelonga, Sow., in its elongated form, and in 
its large and circular foramen, 7. extensa differs from that species in 
the shortness of its beak, the greater comparative breadth of the 
dorsal valve near the hinge-line, and in the absence of biplication in 
front. 
4, Of the shell which resembles Terebratula Boubei, D’ Arch., Ihave 
obtained many single valves from the pebble-bed around Godalming, 
about a dozen specimens (from a similar position in the series) from 
the Lower Greensand between Folkestone and Sandgate, and a few 
single valves from the Sponge-gravel of Farringdon. See Pl. XIL., 
figs. 5-7. The specimens from these three localities have a gencral 
outward resemblance to each other, and appear to be all equally 
distinct from 7. Celtica, Morris, and 7. prelonga, Sow., to both of 
* A somewhat similar depression may be occasionally seen in specimens of 
Waldheimia Celtica, and would usually perhaps afford evidence of an internal 
septum ; this species, however, as is proved by casts and single valves in my col- 
lection, had no trace of an internal septum, 
