150 PERMIAN FOSSILS. 
TEREBRATULILES SUFFLATA, Schl. Von Buch, Ueber Terebrateln, p. 102, 1834. 
(9) — », Phillips, Encyc. Met., vol. iv, pl. ili, fig. 4, 1834. 
(”) — INFLATA 3 Op. cit: paOlA. 
— SUFFLATA  ,, Quenstedt, Wiegmann’s Archiv, 1835. 
Le Cocq., Transl. Von Buch, Mém. Soc. Géol. de 
France, t. ii, pp. 213-14, pl. xix, fig. 12 dzs, 1838. 
oe — » Morris, Catalogue, p. 137, 1843. 
a De Verneuil, Bull. Soc. Géol. de France, 2™ série, 
t. i, p. 26, 1844. 
a= = », Geol. Russ., vol. 1, p. 222, 1845. 
— ELONGATA, var. Schl. Op. cit., vol. 11, p. 69, pl. ix, fig. 9c. 
— SUFFLATA » Tennant, Strat. List, p. 88, 1847. 
= == », King, Catalogue, p. 7, 1848. 
— ELONGATA », Geinitz, Versteineruugen, p. 11, pl. iv, fig. 29 
a, b, c; fig. 32, 6, c, &., 1848" 
Diagnosis.—Smooth to the eye; but microscopically granulated through being 
crowded with minute punctures: in general five eighths of an inch long, and half an 
inch wide: anterior half widest, and obtusely rounded: posterior half rather tapering : 
moderately and regularly convex : rounded at the margins of the anterior half: marked 
with rather prominent lines of growth. Large valve with a regularly-formed mode- 
rately-sized median furrow: wmbone prominent and gibbous: /oramen moderate in 
size; truncating the point of the umbone; and bounded inferiorly by the apex of the 
deltidium. Small valve regularly rounded. 
Epithyris sufiata is not so variable as L. elongata: its variation is chiefly limited to 
the median sinus, which, although well defined in general, is occasionally only slightly 
indicated, as in the specimen represented in figs. 6 and 9, Pl. VII. 
It is smaller and more tumid than the last species ; and so © ly distinct from 
it, that I totally disagree with Ueinitz in u- chem. it diffirs from Epothyris 
elongata in having both valves more 1c. s.-unded 5 : umbcne more gibbous, 
and prominent; the margins of its anterior 1 * rounaec, end not sharp; the small 
valve not ridged (but rounded) medio-longitudinally ; the lmes of growth stronger ; 
the median sinus narrower, and more obviously defined; the posterior half not quite 
so tapering; and the punctures rather smaller. 
ty *hyris sufflata appears to be identical with a shell found in the mountain-limestone 
of Bolland, probably hitherto considered a variety 0° H. sacculus—a distinct, though 
c.os.’ allied species. The latter differs fromthe rmer principally in having the front 
decidedly e..ai,ina*e: both appear to graduate to each other. 
Epithyris suffata is a less common species than L. elongata. It occurs at Humbleton 
Quarry (first noticed by Quenstedt), Tunstall Hill, Ryhope Field-House Farm, Dalton- 
le-Dale, and Castle-Eden-Dene, in Shell-limestone; and at the north end of Black Hall 
rocks, in a brecciated form of a probably parallel rock; also at Tynemouth Cliff, in 
what appears to be a subordinate bed of breccia. The apparently identical shell, 
