MKNKSTTK) i5RITANNI0A. 585 



1872. Menestho Jefrcyxii, A. and R. l>cll, Proe. Gcol. Assoc, vol. ii, p. 209. 



1882. Rissoa Sfejihani^:!, Nyst, Conch. Terr. tert. Belg., p. i»G, pi. xxviii, %. 12. 



1882. Biiisoa Sfcphanint, Van deu Broeck, Ann. Soc. nialac. Belg., vol. xvii, p. 204. 



1890. Menestho Jeffreysii, C. Keid, Plioc. Dep. Brifc., p. 246. 



Specific Clmracters. — Shell small, oblongo-turreted ; whorls 5, convex, obtusely 

 but slightly shouldered above, gradually and regularly diminishing upwards to an 

 abrupt and bluntly pointed apex ; ornamented by strong well-marked costoe, about 

 15 on the body-whorl, nearly reaching the base of the shell, about equal in width 

 to the interspaces; also by fine but distinct spiral ridges; spire elongate, with a 

 rather deep suture; mouth suboval, ol)tusely angulate above, rounded and slightly 

 projecting below. 



Dimensions. — L. 3*5 mm. B. 1'5 mm. 



Distribution. — Recent : Greenland (Jeffreys). 



Fossil : Coralline Crag : Sutton, Boyton. Waltonian : Walton- 

 on-Naze, Little Oakley. 



Remarks. — As stated above. Wood descril>ed in 184i two shells as Rissoa costa- 

 lata {op. cit., pi. xi, figs. 12a and 12/;). In 1869 the name of the former was 

 changed by Jeffreys (Brit. Conch., p. 208) to R. Stefanisi. In 1871, however, A. 

 Bell proposed the generic term MenesUto for both, which has since been generally 

 accepted. The smaller of the two he considered to be a different species, calling it 

 M. Jeffrey si — a compliment which Jeffreys accepted. 



The specimen now figured under the latter name Avas found in the Coralline 

 Crag of Sutton. The one described by Nyst {op. cit.) is evidently the same. 



Menestho britannica, A. Bell. Plate L, figs. 7, 8. 



1871. Menestho britannica, A. Bell, Ann. Mag. Nafc. Hist. [4], vol. vii, p. 360. 



1872. Menestho Brittanica, A. and E. Bell, Proc. Gleol. Assoc, vol. ii, p. 203. 



1874. Menestho Britannica, S V. Wood, Mon. Crag Moll., 1st. SuppL, pt. ii, p. 185, add. pi., fig. 21. 

 1890. Menestho britannica, C. Eeid, Plioc. Dep. Brit., p. 246. 



Specific Characters.— ^heW slender, turreted ; whorls 8 — 9, convex, without 

 spiral sculpture ; spire elongate, somewhat compressed at the apex, base rounded; 

 suture oblique, slightly channelled ; mouth oval, short, about one-fourth the total 

 length, angulated above. 



Dimensions. — L. 8 mm. B. 2 mm. 



Distribution. — Not known living. 



Fossil: Coralline Crag : Sutton. 



R.emarhs. — Some difference of opinion exists as to the identification of this 

 little shell. There are two specimens under this name in the York Museum, one of 

 them bearing the small red tablet, indicating that it is the one originally received 



