288 JOURNAL OF CONCHOLOGY, VOL. 9, NO. 9, JANUARY, I9OO. 



Sound, E. Shetland 10-40 f. Fossil in the Belfast deposit (Praeger) ! 

 Var. inflata Marsh. (J. Conch., vol. 7, p. 253, 1893) — The 

 Minch 50-70 f. This is less spindled than the type, and the last 

 whorl is abnormally inflated. 



This species is everywhere rare, but less so in the Orkneys and 

 Shetlands. Its clear white and polished surface should always dis- 

 tinguish it from any of its congeners. In outline it is like a miniature 

 of Jeffreys' figure of Limncea glabra, and it is also very like a half- 

 grown O. tvarreni, but is more slender and has not the sculptured 

 base of that species. It has also some general resemblance to 

 O. rissoides var. alba, but is thinner and polished. The Loch Bois- 

 dale specimens belong to a dwarf form. An unusually fine specimen 

 from Iona has the periphery finely striated spirally, and one from 

 Scilly has a pronounced umbilicus. Jeffreys' figure is not slender 

 enough ; out of a couple of hundred specimens none are so broad. 

 Sowerby's (fig. 23) is O. insculpta var. Icevissima, but his presumed 

 figure of O. obliqua (22) is this shell. The dimensions are usually 

 smaller than those given by Jeffreys. 



O. warreni Thomps. — Sea-weeds in rock-pools at low spring tides, 

 and dredged dead. Port Erin, Isle of Man (L.M.B.A.) ! Killala Bay 

 (Miss Warren) ! Berehaven (R.I. A. cruise) ; E. Sutherlandshire 

 (Baillie and J. T. M.); Channel and Scilly Islands; Helford and St. 

 Mawe's ; Torbay and Babbacombe Bay ; Tenby, Caldy Island, and 

 Freshwater West ; Connemara, Portrush, and Bundoran ; the Minch 

 and West Orkneys. 



Var. intermedia Marsh. {J. Couch., vol. 7, p. 253-4, 1893) — 

 Guernsey; Scilly; Borough Island; Torbay; Killala Bay; the Minch. 

 Var. zetlandica Marsh., n. var. — Conic-oblong, whorls rounder 

 and less turreted, the last one much smaller, being only one-half the 

 shell instead of three-fourths. Shetlands 50-80 f. (Jeffreys) ; the 

 Minch 65 f. (one specimen). 



Gwyn Jeffreys disputed the specific identity of 0. warreni, uniting 

 it as a variety with O. obliqua, until he dredged some specimens in 

 the Shetlands which struck him as too distinct to be left in that 

 position ; but while specimens of O. zvarreni from the Minch and 

 Shetlands are like his supplementary figure, in which the spire is 

 longer and the whorls less turreted than in those from the rest of 

 Britain, it is merely a local form, and not suitable for a type shell, 

 while Thompson's original figures in the "Annals" are useless for 

 reference. I know of no figure even approximating to the type of O. 

 warreni ; but the shell is an exact miniature of Limneea stagnalis, and 

 the dimensions are the same as those of O. obliqua, but the shape is 

 very different, and extremely variable. Some extreme specimens will 



