ScAPHiTA. MOLLUSCA. CEPHALOPODA. 249 



which are repeatedly divided into many lesser rounded ones; aperture semi, 

 cir cular, truncated at the sides ; syphon at the outer margin — Naut. mod 



Luidii, Ichn. t. vi. f. 292, p. 1 9- Am. sublaevis. Sower. Min. Conch, t. liv 



In limestone, Middle Oolite, at Christian Malford and Kellaways. 



6. O. Luscombi — Depressed, umbilicated ; front rounded ; ribs many, shal- 

 low, waved, surface smooth 5 aperture oblong — Sower. Min. Conch, t. clxxxiii. 

 — In Lias, at Lyme. 



7. O. Brongniarti. — Gibbose 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 — Sotver. 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 

 I^yme. 



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. 



\. S. (Bqualis. — Involute, umbilicate, the inner whorls' concealed ; surface 

 with projecting distant ribs extending all round the whorl ; outer part round- 

 ed, with about two projecting strioe 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 strife, 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. \Q.— Sower. Min. Conch, tab. 

 xviii. f. 4, 5, 6, 7.— In Chalk. In the Geology of England and AVales, p. 268 

 it is stated as an inmate of the Lias beds. 



3. S. striata. — Volutions transversely striated ; striae numerous, oblique, 

 annular, bifurcate ; dorsum tumid ; aperture produced, transversely ovate, 



marginate; siphunculus internal ?—Jl/arafc Suss. 119. t. xxii. f. 3 In Grey 



Chalk Marl. 



4. S. co*/ate.- Volutions convex, laterally compressed, transversely striat- 

 ed, inner whorls concealed, inserted ; striae furcate, numerous, 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. TURRILITA. — 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— ;you'er. Min. Conch, t. xxxvi._In Chalk Marl and 

 Green Sand. 



