ScAPHiTA. MOLLUSCA. CEPHALOPODA. 
249 
which are repeatedly divided into many lesser rounded ones ; aperture semi- 
circular, truncated at the sides; syphon at the outer margin — Naut. mod. 
Luidii^ Ichn. t. vi. f. 292, p. 1 9. Am. sublsevis, Sower. Min. Conch, t. liv.— 
In limestone, Middle Oolite., at Christian MaUbrd and Kellaways. 
6. O. Luscomhi — Depressed, umbilicated ; front rounded ; ribs many, shal- 
low, waved, surface smooth ; aperture oblong — Sower. Min. Conch, t. clxxxiii. 
— In Lias, at Lyme. 
7. O. Brongniarti. — G-ibbose umbilicate ; ribs bent, furcate ; aperture trans- 
verse, oblong, arched, with a thick or inflected lip — Sower. Min. Conch, t. 
clxxxiv. A. f. 2. — Under Oolite, at Yeovil. 
8. O. heterophylla Lenticular, umbilicated, striated ; sinuosities of the 
septa of two kinds, small and acute-angular, or large and ovate ; front round- 
ed; sides convex ; aperture elliptical, with a notch for the reception of the 
preceding whorl. — Soever. Min. Conch, t. cclxvi. — In Lias, Whitby. 
9. O. Bechii. — Gibbose, umbilicated, concentrically striated ; with numer- 
ous thin ribs ; front rounded ; each side furnished with two rows of numerous 
small tubercles ; aperture large Sower. Min. Conch, t. cclxxx. — In Lias, at 
Lyme. 
Gen. SCAPHITA. — Shell commencing with a depressed volu- 
tion, the last turn of which, after being enlarged and elon- 
gated, is diminished and reflected inwards. 
1. wqualis. — Involute, umbilicate, the inner whorls’ concealed ; surface 
with projecting distant ribs extending all round the whorl; outer part round- 
ed, with about two projecting strise between and equal to each of the radii; 
outer whorl ventricose, the ribs upon it much enlarged, and abruptly ter- 
minated before they reach the edge — Sower. Min. Conch, i. xviii. f. 1, 2, 3. 
— Green Sand., Yeovil. 
2. S. obliqua — Obliquely involute, umbilicated, inner whorls concealed, 
covered by transverse strise, dividing into two or three near the outer half 
of the whorl, which is rather flattish and broad, and uniting again on the 
other side — Park. Or. Rem. iii. p. 145. t. x. f. 10. — Sower. Min. Conch, fab. 
xviii. f. 4, 5, 6, 7* — In Chalk. In the Geology of England and Wales, p. 268 
it is stated as an inmate of the Lias beds. 
3. ^.striata. — Volutions transversely striated; strise numerous, oblique, 
annular, bifurcate ; dorsum tumid ; aperture produced, transversely ovate, 
marginate; siphunculus internal? — Manf. Suss. 119. t. xxii. f. 3. — In Grey 
Chalk Marl. 
4. S. cosifato. — Volutions convex, laterally compressed, transversely striat- 
ed, inner whorls concealed, inserted ; strict furcate, num.erous, embracing 
the ambit : sides of the outer volutions smooth, with eight or ten distant, 
oblique, nodular projections ; dorsum broad, convex. — Mant. Suss. 120. t. xxii. 
f. 8-12 Grey Chalk Marl. 
Gen. TURIITLITA. — Whorls contiguous, partitions of the 
chambers sinuous, perforated. 
* Spires sinistral. 
1. T. costata. — Whorls beset with short ribs, beneath which are two rows 
of smaller tubercles.— Min. Conch, t. xxxvi. — In Chalk Marl and 
Green Sand, 
