78 



MOLLUSCA. 



Solarium. 



horny, more or less spiral, and variahle in form; outer 

 side flat ; inner side furnished witli an irregular, nearly 

 lateral tubercle. 



1. S. DiscoiDEUM. — The Discoidal Solarium, pi. XLI. fig. 

 1,2. 



Sulariutn discoideutn. Sowcrby, Min. Conch. I. p. 36, pi. 

 11, upper right hand figs. Fleming, Brit. An. p. 325. 



Shell discoidal; spire consisting of five or six volutions, some- 

 what acuminated at the apex ; outer edge of the body volution 

 provided vtith a very sharp carina, within which, on the base, is 

 a shallow canal ; the upper margin broad, considerably undu- 

 lated, and spirallv striated, but becoming obsolete towards the 

 spire ; umbilicus deep, rounded, and transversely wrinkled ; 

 aperture rhomboidal, obliquely elliptical, and a little pointed at 

 both ends ; outer lip acute at the margin. 



Found in the London Clay at Barton Cliff, Hampshire. 



2. S. CANALicuLATUM. — The Canaled Solarium, pi. XLI. 

 fig. 3, 4. 



Solarium canaliculatum. Sowerby, Min. Conch. VI. p. 43, 

 pi. 524, fig. 1. Fleming, Brit. An. p. 32(j. Lamarck, Env. de 

 Paris, p. 104. Turbo, Brander, Foss. Hant. p. 10, pi. 1, fig. 7, 

 8. Trochtis canaliculatus, Brocchi, II. p. 35y. 



Shell discoidal, convex ; body provided with a prominent 

 crenated margin, both above and below with numerous spiral, 

 unequal, granulated lines ; umbilicus furrowed, and crenated 

 internally ; aperture quite circular. 



Found plentifully in the London Clay at Barton Cliff. 



3. S. CONoiDEUM. — The Conical Solarium, pi. XLI. fig. 5, 6. 

 Solarium conoideum. Sowerby, Min. Conch. I. p. 36, pi. 



1 1, three middle figs. lb., Geo. Trans. IV. 2nd series, p. 336, 

 pi. 11, fig. 14. Fleming, Brit. An. p. 325. 



Shell conical, its height being equal to the diameter of the 

 base, smooth ; volutions slightly depressed, or concave in the 

 middle, and covered with decussating striie, producing rows of 

 granules; umbilicus deep and narrow, with its inner spiral ridges 

 crenated; aperture rhomboidal, or nearly quadrangular. 



Found in the Upper Oolite at Portland, and the Gait, near 

 Folkstone, Kent. 



4. S. SowERnvii. — Sowerby's Solarium, pi. XLI. fig. 7, 8. 

 Solarium patulum. Sowerby, Min. Conch. I. p. 35, pi. 11, 



lower left hand figs. 



Shell almost discoidal ; sjtire much depressed ; umbilicus 

 large, with nearly obsolete crenulations on its margin, except in 

 its interior, where it is striated. 



Found in the London Clay at Ilighgate Hill. 



5. S. PLiCATUM. — The Plicated Solarium, pi. XLI. fig. 

 10, II. 



Solarium plicatum. Sowerby, Min. Conch. VI. p. 44, pi. 

 524, fig. 2. Fleming, Brit. An. p. 326. Lamarck, Env. de 

 Paris, p. 104. 



Shell convex, subdiscoidal; upper surface longitudinally 

 wrinkled, ornamented with three or four very narrow, deep 

 spiral sulci ; base v\ilh a small umbilicus, surrounded by a pro- 

 duced, crenated ridge, which descends into the cavity, and 

 sometimes half closes it, and in other instances it is left more 

 open ; five or six concentric strong, or unequal sulci ; aperture 

 nearly orbicular. 



Found in the London Clay at Barton Cliff. 



6. S. PATLLUM — The Spreading Solarium, pi. XLI. fig. 

 12, 13. 



Solarium patulum. Sowerby, Min. Conch. I. p. 35, pi. 11, 

 lower right hand figs. Lamarck, Ann. du Mus. IV. p. 53, pi. 

 35, fig. 3. Fleming, Brit. An. p. 325. 



Shell depressed, discoidal, smooth ; volutions defined by a 

 crenulated carina, which is strong and produced on the body ; 

 umbilicus wide, with a beautifully crenulated margin, which is 

 surrounded by a border of small denticles; surface provided 

 with fine longitudinal stria;; base with divergent stria;. 



Found in the Dark-coloured London Clay at Highgate. 



7. S. TABULATUM. — The Boarded Solarium, pi. XLI. fig. 

 14. 



Solarium tabulatum. Phillips, Geo. of Yorkshire, I. p. 94, 

 I.l. 2, fig. 3G. 



Shell pyramidal, subturrctcd; the volutions obliquely flat- 

 tened above, with a carinatcd margin on their upper and lower 

 edges, and terminating in a somewhat acute apex ; surface 

 covered with wide-set, longitudinal, strong stria;; base flat; 

 umbilicus small. 



Found in the Speeton Clay at Speeton. 



8. S. Calix. — The Chalice Solarium, pi. XLI. fig. 15. 

 Solarium Calix: Phillips, Geo. of Yorkshire, I. p. 129, pi- 



11, fig. 30. 



Shell pyramidal, turreted ; body large ; spire small, consisting 

 of four rapidly diminishing, flat-sided volutions, bounded above 

 and below by a slightly crenulated, rounded, projecting spiral 

 band ; base rather flat, furnished with a wide, expanding um- 

 bilicus ; aperture subquadrangular. 



Found in the Blue Wick of the Inferior Oolite, Cold Moor, 

 by Mr. Bean of Scarborough. 



9. S. OBNATUM. — The Adorned Solarium, pi. XXXVII.* 

 fig. 39. 



Solarium ornatum. Sowerby, Geo. Trans. IV. 2nd series, 

 p. 336, pi. 11, fig. 13. 



Shell discoidal ; with seven or eight volutions, the three 

 lower ones produced in the middle, and sloping towards each 

 side; the other volutions, which arc very small, and rising 

 abruptly in a conical form, terminate in an acute apex ; the 

 three upper ones smooth, all the others ornamented above by 

 obtuse, smooth radiating ribs, with a sharp carina bounding 

 the body volutioii ; near the margin, both above and below, 

 beset with granules, placed in quincunx order ; aperture rhom- 

 boidal. 



Found by Dr. Fitton in the Upper Green Sand, Isle of 

 Wight. 



FAMILY II.— SCALAllIDES. 



Shell devoid of plaits or folds on the columella ; mar- 

 gins of the aperture united in a circular form. 



Gencs XXXV IlISS0A._iv-emi«i77/c. 



Sliell oblong, turreted, considerably ncuminated ; spire 

 consisting of numerous volutions ; aperture orbicular, or 



