MOLLUSCA. 



Hamites. 



of large flattened tubercles, one of which is in the centre, 

 and the other near the dorsal margin, producing a sort of 

 luululous ridge on both sides, each separated by a slightly 

 waved furrow ; curvature abrupt. 



Found in the Isle of Wight, by G. B. Snow, Esq. and in 

 the Chalk Marie, near Benson, Oxfordshire, by R. Wright, 

 Esq. 



]\Ir Sowerby considers this as the //. Armattts ; but we 

 conceive that the single waved ridge separating the tubercles, 

 in place of two or three ridges, is sufficient to distinguish it. 



5. H. ARMATUS. — The Armed Hamite, pi. II. fig. 6. 

 Sowerby, Min. Conch. II. p. 153, pi. 168; Buckland's 



Bridgewater Treatise, II. pi. 44, fig. 9, 10. Mantell, Geology 

 of Sussex, p. 121, pi. 23, fig. 3 and 4. 



Depressed; provided with nearly regular, continuous, 

 transverse, simple ridges ; and a row of flattened tubercles, 

 nearest to the interior margin ; and another close to the dorsal 

 limb, connecting which are higli broad ridges ; on each side 

 near tlie front a series of these are armed with long, subulate 

 spines, tliicker at the base, and tapering abruptly ; the limb 

 of the other side of tlie curvature with simple, somewhat 

 elevated tubercles ; the ridges are very indistinct on the dorsal 

 region ; section elliptical ; greatest diameter one inch and an 

 eighth. 



Found in the upper Green sand at Rook village, near 

 Benson, Oxfordshire, and in the Chalk Marie of Sussex. 

 f 5. a the section. 



6. H. spiNiGER. — The Spilled Hamite, pi. II. fig. 12. 

 Sowerby, Min. Conch. III. p. 29, pi. 216, fig. 12. 

 Compressed ; with numerous, curved, slightly transverse, 



irregularly formed ridges ; two rows of somewhat sharp 

 tubercles on each side, placed near the dorsal limb, those 

 nearest the front largest ; these embrace several of the ridges 

 into each of their bases, where they terminate, but some of 

 which ascend the sides of the tubercles ; aperture oval ; cur- 

 vature gradual; greatest diameter five-eightlis of an inch. 

 Found in marie near Folkstone. 



7. H. spiNULOsus. — The Prickly Hamite, pi. III. fig. 5. 

 Sowerby, Min. Conch. III. p. 29, pi. 21 6, fig. 1 ; Dentalium 



spinulosum, Miller's MS. Catalogue. 



Compressed, with a gradual curvature, describing nearly 

 the segment of a circle, and equally prominent regular undu- 

 lations, which are nearly obsolete upon the narrow back, 

 eacli alternate one provided with two sharp, slightly divergent 

 spines, situate along each side near the front; aperture 

 elliptical. 



Found at Blackdown, by Mr Miller. 



8. H. TUBERCUL.VTUS. — The Tuberculated Hamite, pi. II. 

 fig. 3. 



Sowerby, Min. Conch. III. p 30, pi. 216, figs. 4, 5. 



Compressed, gradually curved, with unequal undulations, 

 each third one larger than the others, and provided with two 

 obtuse tubercles on both sides, the lateral ones somewhat 

 obscure ; between each of the tuberculated rings are usually 

 situate two smaller ones. 



This has much the aspect of H. spiniger, but differs in the 

 above particulars. 



Discovered at Folkstone, by T^Ir Gibbs. 



9. H. TURGiDus. — The Turgid Hamite, pi. II fig. 8. 

 - Sowerby, Min. Conch. III. p. 30, pi. 216, fig. 6. 



Compressed, with an abrupt irregularly turgid front, and 

 provided with two rows of small obscure tubercles on each 



side placed upon every alternate annulation, with regular 

 annulations, which become obsolete over the back : Suffi- 

 ciently distinguished by the single row of tubercles. 

 Foimd at Folkstone. 



10. H. NODosus. — The Knotty Hamite, pi. II. fig. 5. 

 Sowerby, Min. Conch. III. p. 30, pi. 216, fig. 3. 



Shell nearly round ; externally pearlaceous ; with regular 

 annular undulations ; provided with two rows of obtuse 

 tubercles placed upon the front, each tubercle seated upon 

 two of the rings ; each pair of annulations with a simple one 

 between them ; aperture somewhat ovate. 



This shell is somewhat more inflated than its congeners, and 

 the rings are not so numerous as in some other species. 



Found at Folkstone. 



11. H. TENUIS The Slender Hamite, pi. I. fig. 2. 



Sowerby, Min. Conch. I. p. 136, pi. 61, fig. 1. 



Straight, slender, compressed, tapering rather abruptly ; 

 with obtuse, slightly waved, oblique, somewhat irregular 

 annulations, which sometimes become obsolete on the back 

 margin, while at others they reach only about half way. 



Found in the Clay at Folkstone, by Mr James Gibbs, and 

 at Ringmer. 



12. H. ROTUNDUS. — The Round Hamite, pi. II. fig. 7- 

 Sowerby, Min. Conch. I. p. 136, pi. 61, figs. 2, 3. 



Shell round, slightly and gradually curved, with regular, 

 somewhat obtuse numerous annulations ; aperture round. 

 Found in the Folkstone clay, and at Ringmer. 



13. H. ATTENUATUs The Attenuated Hamite, pi. I. fig. 5, 



and pi. II. fig. 15. 



Sowerby, Min. Conch. J. p. 137, pi. 61, figs. 4, 5 ; Buck- 

 land's Geology and Mineralogy Considered, II. p. 65, pi. 44, 

 fig. 11. Mantell, Geology of Sussex, p. 93, pi. 19, figs. 29, 30. 



Cylindrically compressed ; larger limb abruptly attenuated 

 immediately under the curve, from whence it is round ; with 

 numerous obtuse annulations, which become obsolete towards 

 the back. 



Found in the clay at Folkstone, Laugh ton, Ringmer, Nor- 

 lington, and in the counties of Kent and Surrey. 



14. H. coMPRESsus. — Compressed Hamite, pi. III. fig. 7. 

 Sowerby, Min. Conch. I. p. 136, pi. 61, figs. 7, 8. 

 Compressed, with oblique, sharp, regular, slightly undulated 



annulations, thickest and most prominent behind, and bending 

 towards the curve ; thicker end oval ; the breadth two-thirds 

 its length. 



Found in the clay at Folkstone, and at Ringmer. 



15. H. MAxiMus The Great Hamite, pi. I. fig. 14. 



Mantell, Geology of Sussex, p. 93. Sowerby, Min. Conch. 



I. p. 138, pi. 62, fig. 1. Parkinson's Organic Remains, III. 

 pi. 10, fig. 4. 



Slightly compressed, with somewhat oblique annulations, 

 becoming nearly obsolete behind ; larger end semi-ovate, 

 smaller end nearly round. 



Found in the Clay at Folkstone, and fragments of it have 

 been gathered at Ringmer and Norlington. 



16. H. iNTERMEDii's — The Intermediate Hamite, pi. III. 

 fig. 2. 



Sowerby, Min. Conch. I. p. 139, pi. 62, fig. 4. Mantell, 

 Geology of Sussex, p. 93, pi. 23, fig. 12. Do. in Geology 

 South East of England, p. 169, fig. .3. 



Compressed, with continuous, oblique, protruding annula- 

 tions, somewhat flattened, and thickest on the outer surface, 

 and descending from the internal side. 



