23. O. diaphana, Jeffr. Ann. Nat. Hist. New Ser. vol. ii. p. 341. — R. 



Manifestly distinct from No. 22. 



24. 0. strialata, Alder. — Northumberland, Rr. Conical, striated. 



25. 0. minima, Jeffreys, Ann. Nat. Hist. Jan. 1, 1858. 



26. 0. interstincta, Mont. {Turbo.) — T., 0., Yoluta, and Jaminia ca- 



naliculata, oblonga, and obtusa. — Brit. co. generally. Shallow 

 water, C. With longitudinal ribs. 



27. 0. dolioliformis, Jeffr. — Scarborough, Exmouth, Swansea, Tenby, 



Rr., Scotland. Oval, body-whorl very tumid. 



28. O. Warrenii, Thompson, (Rissoa.) — Turbonilla and 0. obliqua, 0. 



decorata. — Dublin, S. Devon, W. Scotland, R. Turreted. Mouth 

 oblique ; an umbilicus ; no fold or columella. 



29. 0. spirialis, Mont. [Turbo.) — Voluta and Rissoa s.,pellucida,m(\ 



plicatula. — Brit. co. generally, not deep, Mc. Whorls ribbed 

 longitudinally above, spirally beneath. 



30. 0. decussata, Mont. {Turbo.) — T. Helix, Rissoa and 0. arenaria, 



pellucida ?, and d. — Exmouth, Lerwick, etc., R. Ribbed and 

 spirally striated. 



31. O. excavata, Phil. (Rissoa.) — R., 0., and Cingula Harveyi and 



Deshayesiana. — Dublin, Arran, Guernsey, R. Largely sculptured. 



