432 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
Comparison. — This species somewhat resembles C. ddicatula 
Freeh from the Rhaetic of central Europe (Juravischen province) ^ 
in size, angle of branching, and strength of costae. It differs in the 
much greater distance between the individual corallites and in the 
stronger and more abundant proliferations. 
Terebratula suttonensis n. sp. 
PI. 40, figs. 2, 3. 
Elongate biconvex, truncate anteriorly; pedicle valve broadly 
convex toward the beak, becoming flattened toward the front, form- 
ing there a broad sinus in which is a low median ridge with a shallow 
depression on either side. The outer side of the prominent ridges 
bordering the median sinus flattened, giving to this portion of the 
shell a somewhat depressed appearance. Brachial valve regularly 
convex from beak to front, with a shallow, median depression ante- 
riorly, bounded by rather prominent folds on either side. Laterally 
from each of these folds is a broad sinus corresponding to the promi- 
nent ridges of the pedicle valve. Surface smooth except for low 
concentric growth lines. Length about three centimeters, breadth 
about two centimeters. Our single specimen is rather badly crushed. 
Named from the formation. 
Comparisons. — Our species differs from T. globafa Sowerby from 
the Inferior Oolite of England - in its less globulose form, being nar- 
row in proportion to its length and comparatively less thick. The 
fold at the anterior end of the brachial valve is broader as is likewise 
its included sinus. In proportion of length, breadth, and thickness 
and character of anterior fold and sinus it is more like T. phillipsi 
Morris of the European Middle Jurassic but does not have this spe- 
cies' long straight sides extending from beak more than half-way to 
the front of the shell. Our species differs from T. hypsogonia Kitchin 
of the lower Upper Jurassic (Upper Charee) fauna of Cutch ^ in having 
fold and sinus much less strongly developed and in having a much 
less vertical thickness. The lateral sinuses on the brachial valve are 
IF. Freeh. Die Korallen der juravischen Triasprovinz. Palaeontographica, 1891, 
vol. 37, p. 19, pi. 3. flg. lA-C. 
2T. Davidson. British Fossil Brachiopoda. Palaeontogr. Soc. Monogr., 1851-'52, 
vol. 1, p. 54, pi. 13, flg. 2-7. 
3 F. L. Kitchin. The Jurassic Fauna of Cutch. The Brachiopoda. Mem. Geol. 
Surv. India, Palaeontol. Indica, ser. 9. 1900, vol. 3, pt. 1, pi. 6, flg. 1-4. 
