.lEKFREYSIA DIAPHANA. 605 



Diinoisioiis. — L. ] — 2 iniii. 1>. 1 — 2 iniii. 



Dixtrihiifioi. — liccciil : liocal, Channel Islands, j^'almoutli, Clyde district, Skye, 

 Shetland. North-west coast of France, Mediterranean. 



Fossil : St. Erth, Selsey, Ii'ish estuarine clays. 



fu'iiKirls.- — Of the three s|)(;cies of this interesting' o'l'oup of minute shells 

 reported by Jeffreys as found at present in Brilisli seas, all have l)ecn obtained 

 from St. Erth and twofi'om Selsey. They are nnknown, however, from the Anglo- 

 Belgian Crag. ./. opitiliKt has a rather wide range, from the Shetland Islands to 

 the Mediterranean, and is said to be abundant in places though very local. 



JefFreysia diaphana (Alder). Plate L, fig. 20. 



1844—18. Bissoa {?) glahra, ALler, Ann. Mao-. Nat. Hist., vol. xiii, p. 32-5, pi. viii. fig.s. 1—4, 1844; 



R. diaphaim, Traus. Tynes. Nat. Field Club, p. .55, 1848. 

 1853. Jeffreijsia di(ti>hana, Forbes and Hanley, Brit. Moll., vol. iii, p. 152, pi. Ixxvi, fit^-. I. 

 1859. Jefreijsia dlapliana, G. B. Sowevby, 111. Ind. Brit. Shells, pi. xiv, ficj. 13. 



1867—69. Jeffrei/sia dicqdtana, Jeffreys, Brit. Conch., vol. iv. p. 59, 1867 ; vol. v, pi. Ixix, fi"-. 5, 1869. 

 1878. Jeffreysia dla2>hana,(J. 0. Sars, Moll. Reg. Arct. Norv.,p. 359. 



1886. Jeffreysia diaphana, Kendall and R. Gr. Bell, Quart. Journ. Cleol. Soc, vol. xlii, p. 211. 

 1893—98. Jeffreysia diaphana, A. Bell, Proc. Roy. Irish Acad. [3], vol. ii, p. 629, 1893 ; Trans. Roy. 



Geol. Soc. Cornwall, vol. xii, p. 149, 1898. 

 1901. Jeff'reysia diajtharia. Conch. Soc. List., Journ. of Conch., vol. x, p. 18, no. 362. 



Specific Cliaractevs. — Shell minute, thin, ovato-conical ; whorls 4^, convex, the 

 last three-fifths of the total length ; s})ire regularly diminishing in size upAvards to 

 a blunt and abrupt point; suture deep; mouth ovate, angulate above, rounded 

 below ; umbilical chink narrow. 



Dimensions. — L. 2 mm. B. 1 mm. 



Disfrlhiifion. — Recent : British coasts in certain places from the Shetlands to 

 the Channel Islands, ])ul)lin, Cullercoates, coast of Norway, Cherbourg, Spezzia. 

 Fus^iil: St. Erth, Selsey. 



Bemavl-s. — The specimen of ./. diaphana here figured was obtained from 

 St. Erth and belongs to the British Museum of Natural History. 



Jeffreysia globularis, Jeffreys, MS. Plate L, fig. 19. 



1853. Jeff'reysia ylobularis, Jeffreys in Forbes and Hanley, Brit. Moll., vol. iv, Appendix, p. 268, 



pi. cxxxiii, fig. 5. 

 1859. Jeff'reysia. globularis, G. B. Sowerby, 111. Ind. Brit. Shells, pi. xiv, fig. 15. 



1867 — 69. Jeffreysia globularis, Jeffreys, Brit. Couch., vol. iv, p. 62, 1867 ; vol. v, pi. Ixix, fig. 7, 1869. 

 1878. Jeffreysia globularis, G. O. Sars, Moll. Reg. Arct. Norv., pp. 347, 359, pi. xxxiv, fig. 8. 

 1886. Jeffreysia globularis, Kendall and R. G. Bell, Quart. Journ. Geol. Soc, vol. xlii, p. 211. 

 1892. Jeff'reysia globularis, Locard, Coq. mar. Cotes de France, p. 180. 



79 



