OF SOUTnEEX INDIA. 
21 
5. Terebratula oresa, Sowerhij, PL V, Figs. 4 — 5. 
T. ohcsa, Sow., apud Davidson, Brit. Grot. Bvach., 1862, p. 53, pi. v, figs. 13—10. 
T. testa elongate ovata, vakle timiida, valva imihonali alterd panlo tuniidiore, 
superjicie minute punctata, concentrice sidj-distanter striata atque radiatim striolata ; 
fr ante late insimmta awt plus minusve distlncte hiplicatai umhone mlde tuniido in- 
curve, foramine magno, suh-rotimdalo et crasse nwrginalo, oblique truncalo, antice 
prod/ucto atque snh-sulcato ; deltidio simplici, brevissimo, ant onmino obtecto. 
In recording this species from Southern India, I entirely agree with what David- 
son says regarding the same. It is hardly necessary to repeat all that author’s 
observations. The species is very closely allied to the typical blplicata, and might 
he regarded only as a largo variety of it, lint the nmho is more tumid and thick, 
obliquely truncate by a large foramen, the lower lip of which is generally sulcated, 
and so much produced that it nearly, or entirely, conceals the deltidium. The sur- 
face is distinctly radiatcly striated, particularly near the lateral margins. The 
species appears to he local, and I only retain it provisionally under its old name, as 
distinct from the former, because I have only a few specimens for comparison, and 
also because their geological position is somewhat different from that of biplicata. 
Locality. — There arc ouly three large specimens in the collection, all from the 
ferruginous beds of the Ootatoor shales, cast of Ootatoor. The slight variations ob- 
served in their form are exactly similar to those which have been noticed by Davidson. 
Schloenhach (Bcnecke’s Geogn., Palmont. Bcitrsegc, 1808, vol. i, p. 438, &c.) 
restricted the name obesa for the form which occiu’s in the Chalk, referring at the 
same time Davidson’ s figure, (16, loc. cit.) which represent an DTj^per Greensand speci- 
men, to bipUcata as a gigantic variety. This seems to me hardly con*ect, whatever 
opinion there may exist as to the exact geological position of one or the other of 
these forms. Judging from the three views 16, IQa, 166 of Davidson, I can sec 
nothing which would indicate a specific distinction from the form represented in 
figs, lo and loa on the same plate. I, therefore, consider with Davidson the Chalk 
and Upper Greensand form as identical, and the geological horizon of the latter cor- 
responds to that in which we find it in India. 
Schloenhach (loc. cit.) also identifies Ilagenow’s T. Sowerbyi with obesa, the 
former being found in the uppermost cretaceous strata of Iliigen and also occurring 
at [Maastricht. I have a specimen of true Soiverbyi from the latter locality, and this, 
when compared, for instance, with one of obesa from the Chalk near Dover, shows 
remarkable distinctions. T. Soioerbyi is much more attenuate towards the beak, 
which itself is much less incurved and more broadly truncate, and the areal portions 
on each side arc more flattened. Exactly similar distinctions can he seen in 
Schloenhach’ s T. obesa from Pwiigen (Benecke’s Geog., Palmont. Bcitrmge, 1868, 
vol. i, pi. xxi. fig. 7) ; it also appears to he a less tumid species. In true obesa the 
beak is almost entirely incurved to the front. I am, therefore, inclined to regard 
T. Sowerbyi, Ilag., as specifically distinct from T. obesa, Sowerby. 
Formation. — Ootatoor group (beds of Am. rostratus, &c.). 
E 
