PLATE XVI. 



Chemnitzia. 



Fig. 



1. C. elegantissima, Mont. {Turbo.)— T. lacteus, Linn.?, T. aeutus. 



—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. 



3. C. ptjsilla, Phil. Moll. Sic. 2. p. 224. pi. 28. /. 21.— More stout 



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



4, 5. C. rufa, Phil.— And var. C.fulvocincta (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., R. 



Ribbed ; whorls angular above. 



10. C. clathrata, Jeffreys. — Birterbuy Bay, R. Lower part of whorls 



spirally grooved between ribs. 



11. C. indistincta, Mont. {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. 



12. T. subcylindrica, Linn. {Helix.) — T. Montagui, Turbo truncatus, 



subtruncatus, 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. j N. Eu. Thin-grooved suture. 



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



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

 Small, stout. 



15. N. Kingii, Forbes and Hanley. — 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. 



