CONCHOLOGY. 



81 



Univalves, glossy ; mouth oval, large ; spires of the tip turned 

 > —"'Y—"' ' backwards. 



Test. Min. Rar. tab. 1, fig. 24. 

 From Sandwich ; very rare. 

 Reticulata, 21. Reticulata. Shell white, pellucid ; with one re- 

 ticulated whorl ; mouth round ; central cavity small. 

 Test. Min. Rar. tab. 1. fig. 26. 

 From Reculver ; extremely rare. 

 T..k„io.. 22. Ttthidata. Shell with three longitudinally striate 



whorls ; a margined tube at the base, instead oi a pil- 

 lar cavity, extending beyond the surface of the shell. 

 Lin. Trans, vol. iii. tab. 13, fig. 35, 3&. 

 Found on the coast of Pembrokeshire, by Mr 

 Adam. 

 Fascia t a, 23. Fasciata. Shell pellucid, white, the first spire 



marked with three transverse purple belts, the middle 

 one broad, the lateral ones narrow ; whorls three, 

 smooth, the first large ; mouth expanded, with a small 

 pillar cavity. 



Lin. Trans, vol. v. tab. 1, fig. 20, 21. 

 v.--,- • 24 Nitidissima. Shell comeus, pellucid, with two 



ma whorls very hnely striated transversely, extremity 



glossy ; pillar cavity distinct. 



Lin. Trans, vol. v. tab. 1, fig. 22 — 24. 

 Found with the preceding species. 

 Bicolor, 25. Bicolor. Shell smooth dull, inside of the shell 



white, pillar cavity small. 



Lin. Trans, vol. v. tab. 1, fig. 25 — 27. 

 The four preceding species were found by Mr Adam 

 on the coast of Pembrokeshire. 

 Margarita 2 ^>. Margarita. Shell with four strong convex volu- 

 tions ; colour white, pearlaceous, with one faint rufous 

 brown band on the upper part of the body whorl ; 

 mouth sublimated ; inside nacred ; base very convex ; 

 pillar cavity large ; diameter one eighth of an inch. 

 Mem. Wer. Soc. vol. i. tab. 8, fig. 5. 

 First observed on the Scottish coast at Dunbar by 

 Mr Laskey; we have found it on other parts of the same 

 coast, and in Orkney and Zetland where it is plentiful. 

 Serpuloi- 2 ^" Serpuloi'/es. Shell white, glossy, with three cy- 

 ,j es> lindrical volutions destitute of striae, apex depressed 



scarcely elevated above the other whorls ; mouth orbi- 

 cular, slightly adhering to the body, and turning con- 

 siderably downwards, forming a large and deep pillar 

 cavity. 



Test. Brit tab. 21, fig. 3. 

 Found on the coast of Devon by Mr Montagu. A 

 variety very minutely striated occurs in great abun- 

 dance on the coast of Zetland. 



B. Base Imperforated. 



28. Aspersa. Shell marked with fascia of dark 

 - spmi, b rownj sub-globose, with four volutions, the superior ones 

 placed somewhat laterally ; mouth semilunar, elongated, 

 margin reflected, white; diameter about an inch and half. 

 Brit. Zool, tab. 84, fig. 129- H. hortensis. 

 Brit Shells, tab. 131. 

 This is a very common species, about old garden 

 Walls, hedges and groves. 

 ■hjioralis 2 ^ Nemorulis. Shell sub-globose, with five volutions, 

 most frequently yellowish or reddish, fasciated with 

 dark coloured bands, those with five bands have the 

 two uppermost much smaller than the rest ; mouth lu- 

 nated margined ; inner edge of the lip and pillar inva- 

 riably of a dark colour ; diameter scarcely an inch. 

 Brit. Shells, tab. 13. 

 A common British shell, in woods, hedges, and shady 

 places. 

 ■Brtcmis, 30 - Hortensis. Shell sub-globose with five volutions, 



T0L, TH. PART f. 



resembling the last, but in tlu's the margin of the mouth Univatws. 

 is black ; greatest diameter three quarters of an inch. """ "Y"^"'' 



Found in similar situations with the preceding, in 

 England and Scotland. 



31. Arbnstontm. Shell sub-globose with five volutions, Arbusta- 

 a little rounded, well defined by the separating line, and rum, 

 wrinkled longitudinally with a single band of brown 



about the middle of the whorl ; mouth lunated ; margin 

 reflected,- the inside bordered with white; diameter 

 about three quarters of an inch. 



Brit. Zool. tab. 8.5, fig. 130. 



Brit. Shells, tab. 136. 

 Delights in black boggy soil among trees ; a commOu 

 species in Britain. It is found likewise in Orkney and 

 Zetland. 



32. Fusca. Shell thin, pellucid, with five or six Fusea., 

 smooth whorls ; mouth lunated ; lip thin, not reflected^ 

 except a little at the lower angle, at which part is a 

 small depression, but no pillar cavity ; diameter about 

 tlrree eighths of an inch. 



Test. Brit. tab. 13, fig. 1. 

 Found by Mr Montagu in a wood in Devonshire, 

 and by Mr Laskey near Musselburgh, Haddingtonshire. 



3". laevigata. Shell thin, fragile, flesh-coloured with Lsvigata, 

 three volutions ; the first extremely large, the others 

 very small, scarcely produced and placed laterally ; 

 wrinkled transversely, striated longitudinally ; epider- 

 mis brown, rising into membranaceous ridges ; mouth 

 sub-orbicular, large, margin thin ; diameter about three 

 quarters of an inch. 



Brit. Zool. tab. 86. fig. 139. 

 Brit. Shells, tab. 105. 

 Found sparingly upon the English shores; more plen- 

 tifully on the Scottish coast, and in Orkney and Zetland. 



34. Glutinosa. Shell thin, diaphanous, sub-orbicular ; Glutinosa., 

 whorls three, the body whorl occupying almost the whole 



of the shell ; mouth oval, large, extending nearly to the 

 apex ; length rather more than half an inch, breadth 

 three eighths. 



Test. Brit. tab. 16. fig. 5. 

 Found by Mr Boys in marshes at Deal, and by Mr 

 Montagu in a water course near Beading in Berkshire. 



35. Striata. Shell, greenish white, pellucid ; moutli Stiiata, 

 oval, with three spires reflected on the back. 



Test. Min. Rar. tab. 1 . fig. 29. 

 From Sandwich; very rare. 



36. Variegata. Shell sub-pellucid, smooth, with red varie<>at» 

 lines ; whorls four, the first veniricose ; margin of the 

 aperture very much spread. 



Adam's on Lin. Trans, vol. iii. page 67. 

 Found by Mr Adam on the coast of Pembrokeshire. 



Genus XVII. Nkrita. 



mouth semicircu- XVII. Ne 



Shell suhglohose, depressed beneath , 

 lar ; pillar nearly transverse andjlat. 



Obs. In this genus the pillar is obliquely truncated, so 

 that the opening is, in general lunated. Latreille and 

 Lamarck have separated the genus Natica from that of 

 Nerita. The Naticae are distinguished by having a pillar 

 cavity, and in being destitute of teeth. Those species 

 are retained in the genus Nerita, which have an im- 

 perforated base, with the pillar sometimes furnished 

 with teeth. As there are so few true Nerita? British, we 

 will, for the present, retain the Natica? aloDg with them, 

 and merely subdivide the genus. 



A. Base imperforated. Nerita. 



1, Liltoralis. Shell thick, strong, variously colour- Littoralh, 



