PLATE XVI. 



Chemnitzia. 



Fig. 



1. C. ELEGAXTissiMA, Iloiit. (Twrbo.) — T. lacteus, Linn.?, T. acutits. 



— Brit. CO. generally ; not deep, C. Interstices of longitudinal 

 ribs smooth. 



2. C. siMiLLiMUS, Mont. (Turbo.) — C. gracilis, Phil. More slender 



and minute than f. 1. 

 8. C. PTJSILLA, Phil. Moll. Sic. 2. p. 224. ^j^. 28. /. 21.— More stout 



than f. 1, with the ribs straight and broad. Medit., Brit. ? 

 4, 5. C. RUFA, PJul. — And var. C.fidvocincta (f. 5). — Brit. co. gene- 



rally, 15 to 50 fath., Mc. Spiral grooves between ribs. 



6. C. FORMOSA, Jeffreys, [Odostomia.) — Swansea, Shellness, Bantry 



Bay, etc., Mr. Grooved between ribs, excavated at suture. 



7. C. FENESTRATA, Forbes and Jeffr. [Odostomia.) — Torbay, etc, R, 



With pits between spiral ridges. 



8. C. RUFESCENS, Forbes. — Odostomia and Turritella indistincta and 



scalaris. — Clyde, Hebrides, Oban, 15 to 50 fath., R. More 

 stout than C. rufa. Three-banded. 



9. C. SCALARIS, Philippi, [Melania.) — Exmouth, Guernsey, Medit., B. 



Ribbed ; whorls angular above. 



10. G. CLATHRATA, Jeffreys. — Birterbuy Bay, R. Lower part of whorls 



spirally grooved between ribs. 



11. C. INDISTINCTA, Mout. [Turbo.) — Odost., Turritella, Terebra, and 



Pyramis truncata and speciosa, etc. — Brit. co. generally, 5 to 40 

 fath., Mr. ; S. Eu. Ribs curved, striated between. 



Truncatella. 



13. T. SITBCTLINDRICA, Linn. [Helix.) — T. Montagui, Turbo truncatua, 

 mbtruncatus, Cyclostoma truncatulum, Turritella t. and s., etc. — • 

 "Weymouth, S. Devon, Scarborough, etc., C. 



Natica, 



13. N. HELicoiDES, Johnston. — Scotland, Scarborough, etc., 15 to 40 



fath., R. ; N. Eu. Thin-grooved suture. 



14. N. Montagui, Forbes. — Nerita rufa, Natica r. and rutilla. — Prin- 



cipally northern loo. In sand and gravel, 12 to 90 fath., Mr. 

 Small, stout. 



15. N. KiNGii, Forbes and Uanley. — Northumberland, unique, Jef- 



freys coll. 



16. N. NiTiDA, Donovan. — Nerita and Natica catena, nitida, Alderi, 



glaucina, etc. — Brit. co. generally, 4 to 90 fath., C. Oblique, 

 marked with undulating lines. 



