334 JOURNAL OF CONCHOLOGY, VOL. 9, NO. II, JULY, I9OO. 



O. pusilla Phil, {non Jeffr.) — L. 0*25 in.; b. o'o6; whorls 9-10. 

 Muddy sand in shallow water. Stilly Islands (Burkill and J.T.M.) ; 

 Channel Islands ; Land's End, Falmouth, and Fowey ; Plymouth 

 Sound, 16 f. ; Borough Island, Torbay, Babbacombe Bay, and Ex- 

 mouth; Caldy and Tenby; Southport; Connemara, Mayo, and Sligo; 

 Portmarnock; Loch Inver, 25 f. Fossil in the Belfast clays (Praeger)! 



Var. grossa Monter. {J. Conch., vol. 7, p. 384, 1894). — L. 

 0^25 ; b. 0*08 in. Torbay, Gairloch, Loch Inver, and Stornoway. 

 Judging from Jeffreys' description and figure of O. sinuosa, 1 and after 

 examining other specimens from the same dredging station, I con- 

 sider that shell to belong to this variety, and that his specimen was 

 not quite mature. 



Var. cylindrata Marsh. (J. Conch., vol. 7, p. 255, 1893). — L. 

 0*20 ; b. 0*04 in. Jersey, Mount's Bay, Torbay, Tenby, Southport, 

 Aberdovey, Bantry Bay, Connemara, Mayo, Sligo, and Dornoch 

 Frith. 



Var. minuscula Marsh. (J. Conch., vol. 6, p. 347, 1891). — L. 

 o*i ; b. 0*03 in. Many places on the English, Welsh, and Irish 

 coasts. 



This species appears to be most prolific in Babbacombe and Teign- 

 mouth Bays. Very rarely it has straight ribs — corresponding to 

 similar forms of O. lactea and O. innovata — three instances in several 

 hundred specimens. The tooth-like fold is usually observable in this 

 and the next species, but less so in the last, and the three occasionally 

 exhibit the same peculiarity of sculpture that I have noticed in O. 

 indistincta and O. intersiincta, the last whorl having finer and more 

 numerous ribs than the rest of the shell. 



Sowerby's figure (pi. xvi., fig. 3) is meant for this species, but it 

 should be larger, less compressed, the ribs oblique, and the sutural 

 lines deeper. 



O. innovata Monter. (=0. pusilla Jeffr.) — Channel and Stilly 

 Islands, Penzance, Borough Island, Torbay, and Freshwater West. 

 Whorls 9-10. 



Var. nana Marsh. (J. Conch., vol. 7, p. 385, 1894). — L. ot ; 

 b. o'o3 in. Guernsey, 20 f. 



A scarce species, and rare in a living state. The last whorl is pro- 

 portionally shorter than in O. lactea or O. pusilla. This and the last 

 two species, with their varieties, will be found more fully dealt with in 

 /. Conch., vol. 7, pp. 382-5, 1894. 



O. delicata Monter. (J. Conch., vol. 7. p, 255, 1893). — Bundoran, 

 in Donegal Bay (" Porcupine "). I have it also from the same locality, 



j Moll. "Lightning" and "Porcupine," Proc. Zool. Sac, 1884, p. 358, pi. xxvii., f. 1, one specimen. 



