224 JOURNAL OF CONCHOLOGY, VOL. 9, NO. 7, JULY, 1899. 



N. and E. Sutherlandshire (Baillie)! Sound of Sleat, 50 — 90 f., and 

 Barra, 14 f. (Somerville and J.T.M.); Scilly Islands (Burkill and 

 J.T.M.); Tenby and Caldy Island; Bantry Bay; Connemara; Achil 

 Island; Portrush; Staffa; Iona; Rona; Oban; Thurso; S. and W. 

 Orkneys; Vidlin Voe and off Lerwick, Shetlands. 



The longitudinal sculpture of this species appears to have escaped 

 observation. Fresh specimens have coarse longitudinal striae, which 

 are much stronger and puckered on the upper parts of the whorls, as 

 in the next species; these disappear in dead or worn examples. In a 

 few cases the spiral lines are absent from the base, and rarely the shell 

 is conical. Specimens from Thurso are the largest, attaining a line in 

 length. A distortion occurs in which the outer lip is expanded and 

 there is a pronounced umbilicus, indicating aged specimens, and I 

 have a scalariform monstrosity from the west of Ireland. 



Jeffreys' figure is good as an outline, but his micro, figure is useless. 

 Sowerby's is not sufficiently slender; neither is Forbes and Hanley's. 

 Alder's original figure 1 (as O. cylindricd) is a fair one, but does not 

 exhibit the peripheral striae, though that is an error of the draughts- 

 man, as he mentions it in his description. 



O. truncatula Jeffr. — Exmouth (Coll. MacAndrew); Scilly Islands 

 (Burkill and J.T.M.); Land's End; Falmouth and Helford; Torbay 

 and Babbacombe Bay. 



A very local but not uncommon species. There are two forms, one 

 long and slender, the other short and broad, which I take to be the 

 male and female. The striae in fresh specimens are visible with an 

 ordinary lens. Jeffreys says it is " not unlike the young of Truncatella 

 truncatula" but a specimen of the latter the same size as O. truncatula 

 has very convex whorls and a deep suture, being almost scalariform, 

 whereas this shell has compressed whorls and a channelled suture. 

 The broad or female form is more like Acicula lineata. From O. nivosa 

 this differs in being more cylindrical, in consequence of the apex being 

 blunter and the last whorl the same width as the preceding one. 

 O. truncatula was first discovered by Mr. W. Rouse, of Plymouth, 

 in 1849, and in the following year by Mr. R. Bolton of the same 

 town and Mr. Barlee, when it was described by Gwyn Jeffreys 2 from 

 specimens received from the latter gentleman. 



Both Sowerby's and Jeffrey's figures are taken from what I consider 

 to be the male or slender form ; Sowerby's is the best, but the mouth 

 is too large ; while Jeffreys' figure is too spindled, and does not exhibit 

 the conspicuous fold on the pillar. Forbes and Hanley's is most 

 unreliable. 



1 Ann. Mag. Nat. Hist., vol. 13, pi. 8, fig. 14, 1844. 



2 Ann. Mag. Nat. Hist, (2) vol. 5, p. 109, 1850. 



