ODOSTOMIA. 115 



straight, and seldom furnished with a tooth. (Turbonilla 

 or Chemnitzia.) 21. clathrata ; 22. indistincta ; 23. in- 

 terstincta ; 24. spiralis ; 25. eximia ; 26. fenestrata ; 27. 

 excavata ; 28. scalaris ; 29. r?t/w; 30. ?«rtra ; dl.pusilla. 



C. Elongated, smooth and polished ; pillar straight, very rarely 

 furnished with a tooth. (Eulimella.) 32. Scillce-, 33. 

 acicula : 34. nitidissima. 



A. Typical. 

 1. Odostomia mi'nima"*, Jeffreys. 



0. minima, Jeffr. in Ami. & Mag. 1ST. H. 3rd ser. i. p. 45, pi. ii. f. 3. 



Shell forming an oblong cone, very thin, transparent and 

 lustrous : sculpture, a few slight longitudinal wavy striae : 

 colour clear white : spire gradually tapering to a blunt, nearly 

 globular, and inverted point : whorls 4-5, convex ; the last is 

 proportionally broader than the next, and exceeds in length the 

 rest of the spire when the shell is placed with its mouth upper- 

 most : suture deep, scarcely oblique : mouth exactly oval, 

 slightly expanded but entire at the base ; it occupies nearly 

 one-third of the shell : outer lip somewhat flexuous, but neither 

 prominent nor expanded : inner lip thin, adhering to the upper 

 slope of the base and slightly reflected below ; it is united with 

 the outer lip so as to form a continuous but indistinct peri- 

 stome : umbilicus small and narrow : tooth or fold slight and 

 seldom visible : operculum pale yellow, delicately striated in 

 the line of growth ; spire consisting of 2-3 whorls. L. 0*05. 

 B. 0-025. 



Habitat : Living on decayed fronds and at the base 

 of LaminaricB, procured by grappling just beyond low- 

 Avater mark, in Lerwick Sound, and at Kyleakin in Skye 

 (Bar lee) ; dead in Shetland and the Hebrides, 50-60 f. 

 (J. G-. J.) ; St. Mawes, Falmouth (Hockin) ; in dredged 

 sand from Guernsey (Waller) . It either is rare or from 

 its minuteness has escaped observation. 



This is the shell noticed by Forbes and Hanley in the 

 Appendix to their work (p. 282) as allied to Aclis Gul- 



* Smallest. 



