Edomphalus. 



MOLLUSCA. 



U 



12. C. DEPRESSUS — The Depressed Cirrus, pi. XLI. fig. 

 29, 30. 



Cirrus depressus. Mantell, Geo. of Sussex, p. 195, pi. 18, 

 fig. 18 and 22. Sowerby, Min. Conch. V. p. 35, pi. 428, fig. 3. 

 Phillips, Geo. of Yorkshire, I. p. 112, pi. 6, fig. 12. 



Shell depressed, subdiscoidal; volutions separated by a deep, 

 wide, canaliculate, angular suture, a small portion of each only 

 being visible, their internal sides regularly convex, the apical 

 one hardly elevated above the body volution; aperture obtusely 

 angular ; whole surface covered with strong spiral striae. 



This species differs from C. perspectivus, in the spire being hardly 

 elevated above the margin of the body volution, which renders the 

 umbilicus shallow. 



Found in the Upper or Flinty Challi, near Lewis, Suffolk ; 

 Kent, and Wiltshire ; also in the Kelioways Rock at Hackness 

 and Scarborough. 



13. C. PERSPECTIVUS The Perspective Cirrus, pi. XLI. 



fig. 31 and 33. 



Cirrus perspectivus. Mantell, Geo. of Sussex, p. 194, pi. 

 18, fig. 12 and 21. Sowerby, Min. Conch. V. p. 35, pi. 428, 

 fig. 1, 2. 



Shell obtusely conical, not quite so high as wide ; volutions 

 six or seven, convex, a little square- externally ; base rather 

 flattened ; umbilicus wide and deep, exposing about a third of 

 the width of the inner and convex edges of the volutions; aper- 

 ture transversely oblong; surface covered with fine spiral striae; 

 inner surface pearlaceous. 



Found in the Upper Chalk of the South Downs, Sussex ; 

 Kent, and Wiltshire ; and sparingly in the Lower Chalk. 



14. C. CARINATUS The Keeled Cirrus, pi. XLL fig. 32. 



Cirrus carinatus. Sowerby, Min. Conch. V. p. 36, pi. 429, 



fig. 3, 4. 



Shell discoidal, smooth, ; spire depressed, consisting of three 

 or four ventricose volutions, obtusely carinated, and convex 

 below ; umbilicus large and deep ; aperture transverse and sub- 

 ovate. 



Found at Lakehampton Hill, near Cheltenham. 



15. C. GRANUI.ATUS. — The Granulated Cirrus. 

 Cirrus granulatus. Mantell, Geo. of Sussex, p. 195. 

 Conical ; with five or six obscurely quadrangular volutions, 



depressed on their upper and under surface, broad and slightly 

 convex on the outer margin ; ornamented with very regular, 

 granulated, or monihform striw. 



Found in the Lower Chalk, near I-ewis, by Dr. Mantell. 



We have never seen either a figure or specimen of this species. 



Genus XXXVIL— EUOMPHALUS.—- S'ozt'erZ»y. 



Orbicular, conical; spire short, with three or four 

 volutions, imbricated above, and smooth below; aperture 

 of a round polygonal form ; umbilicus large, penetrating 

 to the apex of the shell. 



The shells of this genus are known only in a fossil 

 state; the species strongly resemble those oi Delphinula, 

 the volutions, however, of that genus increase in size 

 much more rapidly than those of Etiomphalus. 



1. E. CALYX. — The Flower-cup Euomphalus, pi. XLIL 

 fig. 23. 



Euom])halus calyx. Phillips, Geo. of Yorkshire, IL p. 225, 

 pi. 13, fig. 3. 



Shell depressed ; with three or four volutions, the apical one 

 hardly elevated above the others ; external margin of the volu- 

 tions provided with a narrow carina, which forms a separating 

 internal suture to the lower portions of all the volutions ; base 

 of the shell deeply concave. 



Found in the Mountain Limestone at Bolland. 



2. E. ANGULATUS — The Angular Euomphalus, pi. XLIL 

 fig. 26, 27. 



Euomphalus angulatus. Sowerby, Min. Conch. I. p. 114, 

 pi. 52, fig. 3. 



Shell with three much depressed volutions, and a series of 

 three spiral ribs on their upper surface, the lower one on the 

 extreme edge of the volution; the whole surface being covered 

 with numerous longitudinal, subimbricated, distant, rough, irre- 

 gular striae ; base with five concentric, somewhat rounded ribs, 

 which are crossed by remote, indistinct striae, diverging from 

 the centre ; these concentric ridges on the base form five 

 sharpish angles, and those of the spire three more acute angles, 

 on the margin of the outer lip ; aperture obscurely octangular. 



Found in Limestone at Colebrook Dale. 



3. E. FUNATus — The Corded Euomphalus, pi. XLII. fig. 

 24, 25. 



Euomphalus funatus. Sowerby, Min. Conch. V. p. 71, pi. 

 450, fig. 1, 2. Skenea funata, Fleming, Brit. An. p. 314. 



Shell subconic, very short, consisting of three depressed volu- 

 tions ; provided with a series of narrow, rounded, thread-like, 

 spiral ribs, crossed by numerous, transverse, thin stria; ; umbili- 

 cus rather small ; base with several concentric ridges. 



This species is distinguished from E. discors, by having ribs on 

 its base, and in the transverse stria; being much finer, closer, and 

 less rough in appearance, particularly those upon the upper surface. 



Found in the Limestone at Dudley. 



4. E. PENTANGULATUS. — The Five-angled Euomphalus, pi. 

 XLIL fig. 28, 29. 



Euomphalus pentangulatus. Sowerby, Min. Conch. I. p. 

 97, pi. 45, fig. 1, 2. Phillips, Geo. of Yorkshire, II. p. 225, 

 pi. 13, fig. 13. lb.. Treatise on Geology, I. p. 163, fig. 13. 

 Skenea perangulatus, Fleming, Brit. An. p. 314. 



Shell consisting of five or six depressed, almost entirely 

 exposed, volutions ; the spire being somewhat sunk below the 

 body, or external volution ; the volutions provided with an 

 acute, elevated, central, spiral carina, or rib, on the superior 

 portion of the shell, extending from the centre of the aperture 

 to the apical convolution ; the base with a slightly angular, 

 nearly obsolete, concentric ridge ; the whole crossed by some- 

 what fine, sharp, elevated striae; aperture obscurely pentangular, 

 somewhat rounded externally; the under side deeply and widely 

 umbihcated; internal cavity divided into chambers, by imperfo- 

 rate septa. 



The shell appears to be thin. 



Found in the Carboniferous Limestone of Ireland. 



5. E. CATILLUS. — The Little-dish Euomphalus, pi. XLII. 

 fig. 30, 31. 



Euo7nphalus catillus. Sowerby, Min. Conch. I. p. 98, pi. 

 45, fig. 3, 4. Phillips, Geo. of Yorkshire, II. p. 225, pi. 13, 



X 



