Hamites. 



MOLLUSCA. 



.) 



Found in the Folkstone Clay, and at Ringraer. 



17. H. GiBBOsus. — The Bulging Hamite, pi. III. fig. 1. 

 Sowerby, Min. Conch. I. p. 140, pi. 62, fig. 4, right hand 



figure. 



Shell gibbous, with prominent, oblique, somewhat distant 

 annulations ; descending from the outer surface, where they 

 are thickest ; spreading out into a flattened continuous plate 

 behind ; back much depressed, front rounded, producing an 

 oval termination, with the shortest diagonal from back to 

 front ; contrary to the character of all its congeners. 



From the Clay at Folkstone. 



18. H. ADPREssus. — The Adpresscd Hamite, pi. II. fig. 4. 

 Sowerby, Min. Conch. I. p. 140, pi. 61, fig. 6. 

 Flattened in front ; destitute of annulations ; lesser limb 



acute, and pressed close to the larger one ; surface smooth, 

 and provided with equidistant circles throughout the whole 

 shell, which appear to indicate the septa. 

 From the Clay at Folkstone. 



19. H. BucKLANDi Buckland's Hamite, pi. II. fig. 2. 



Phillip's Geology of Yorkshire, pi. 1. fig. ; Buckland's 



Geology and Mineralogy, 11. p. 65, pi. 44, fig. 8. 



Compressed ; horn-shaped ; much and gradually incurvated, 

 with somewhat remote, slightly developed, oblique annula- 

 tions, which become nearly obsolete on the inner margin. 



Found in the Gait or Folkstone Marie. Fig. 2 a represents 

 the transverse section, exhibiting the lobes and saddles, and 

 the siphuncle at b. 



20. H. ARTicoLATus. — The Articulated Hamite, pf. II. 

 fig. 14. 



Buckland's Geology and Mineralogy Considered, II. p. 65, 

 pi. 44, fig. 13. 



Compressed, curvature gentle, with remote undulous ribs ; 

 the sinuous terminations of the transverse plates are visible 

 through the ribs, having their secondary lobes rounded 

 towards h, and pointed inwards at c, somewhat resembling the 

 secondary lobes of the genus Ammonites. 



Found in the Green sand at I^rl Stoke. 



21. H. Lyelli Lyell's Hamite, pi. I. fig. 3. 



Buckland's Geology and Mineralogy Considered, II. p. 65, 



pi. 44, fig. 11. 



Shell a little compressed, gently curved, with remote, 

 slightly developed spiral ribs, which are almost lost on the 

 interior side. The lobes and saddles of the transverse plates 

 are exhibited on the upper extremity, or aperture. 



From the Folkstone Clay. 



22. H. cosTATUS The Ribbed Hamite, pi. I, fig. 8. 



Hamifes intermedius, Sowerb}', Min. Conch. I. pi. 62, fig. 2. 



Slightly compressed, with remote, strong, oblique, some- 

 what uniUilous ribs, or annulations, descending to their in- 

 ternal side, and most developed towards the outer side ; lobes 

 and saddles of the aperture well marked. 



From the Folkstone Clay. 



23. H. iNcuuvATUs. — The Incurved Hamite, pi. I. fig. 4. 

 Parkinson's Organic Remains, III. pi. 10, fig. 2. 

 Slightly bent, gently tapering, and a little compressed ; 



with well defined regular annulations, which are strongly 

 elevated throughout. 



24. H. RECTUS The Straight Hamite, pi. I. fig. 1 1 . 



Parkinson's Organic Remains, HI. p. 144, pi. 10, fig. 1. 

 Straight, (so far as at present known) with the rnnulations 



numerous, oblique, descending to the right, and but slightly 

 developed ; aperture roundish oval. 



25. H. ANNULATUs — The Ringed Hamite, pi. I. fig. 10. 

 Parkinson's Organic Remains, HI. p. 144, pi. 10, fig. 5. 

 Slightly compressed, considerably incurved, forming nearly 



the segment of a circle, with regular, equidistant, distinctly 

 defined, but not much raised annulations, somewhat less ele- 

 vated on the inner side. 



Found in the Green sand, Wiltshire. 



26. H. iNFLEXus — The luHected Hamite, pi. I. fig. 12. 

 Parkinson's Organic Remains, p. 144, pi. 10, fig. 3. 

 Hooked, with strong, remote, nearly equidistant, slightly 



waved annulations, interrupted only by a sub-carina on the 

 internal side ; between these are two short, pointed ribs, 

 which extend about half over the surface on the external side ; 

 the whole exhibits the hooked form of this species nearly 

 complete, and the bend rather gentle. 

 Found at Shotover Hill, near Oxford. 



27. H. ELLiPTicus. — The Oval Hamite, pi. II. fig. 1. 



Mantell, Geology of Sussex, p. 122, pi. 23, fig. 9. 



Compressed, surrounded by even undulating ribs, each orna- 

 mented with two small tubercles situate on the outer margin ; 

 curvature elliptical. 



Found at Middleham by G. A. Mantell, Esq. who justly 

 remarks, that " this Hamite appears to be identified by its 

 even undulating ridges, each furnished with two tubercles, 

 and the elliptical form of its curvature. It must, however, be 

 acknowledged, that there is considerable difficulty in distin- 

 guishing the essential characters of a fossil, from the varia- 

 tions that are produced by age or accident, particularly when 

 only a single specimen is known." 



28. H. MULTicosTATUs — The Many-ribbed Hamite, pi. 

 II. fig. 9. 



Mantell, Geology of Sussex, p. 123, pi. 23, fig. 5. 



Subcylindrical, with numerous, oblique, narrow ribs, with- 

 out any appearance of tubercles. 



Mr Mantell considers this as nearly allied to Hamiles 

 alternatus ; it is, however, much larger in its diameter, being 

 nearly an inch and an eighth. 



Found at Harasey by Mrs Mantell. 



29. H. ALTERNATUS. — The Alternating Hamite, pi. II. 

 fig. 13. 



Mantell, Geology of Sussex, p. 122. pi. 23, figs. 10, II. 



Subcylindrical, with distinct, oblique, annular ribs, which 

 become obsolete in the internal margin, and two rows of 

 pretty large tubercles, which are marginal, and placed on each 

 alternate rib ; curvature gradual. 



Found at Middleham. 



Mr Mantell says the specimen he described was elliptical 

 from compression ; and the tubercles being placed on each 

 alternate rib, separates it from every other spiniferous Hamite. 



Genus III.— TURRILITES.— Z«?77areA. 



Shell spiral, multilocular, turreted, volutions conti- 

 guous and all conspicuous ; partitions articulated by 

 sinuous sutures ; septa transverse, foliaceous, close, 

 imperforate, lobed, and liciniate at the margin ; siphuncle 

 near the upper part of the volutions ; aperture round ; 

 columella smooth ; outer chamber large. 



Tiie species of this genus have only been found in tlie 

 Chalk marie. 



1. T. TUBERCULATA The Tubefculated Tunilite, pi. Ill, 



fis. 5. 



