32 DTJNDEY GASTEEOPODA. 



The apex of our single specimen is imperfect. 



Locality — Dundry. Inf. Ool. 



This is named after our President, Mr. "W. Sanders, F.E.S. 



TEOCHITS BrPLICATUS, Sowerby. 



1817 T. duplicatus, Sow. Min.'Conch. pi. 181, fig. 5: 

 1844 Turbo duplicatus, Goldf. Tab. 179, fig. 2. 



1850 Trochus D'Orb. Pal. fi\ Terr. Jur. 



2, Gast. pi. 313, figs. 5—8. 



1858 Qu. Jura, tab. 43, figs. 18—19, 



p.,314. 



1867 Laube. Gast. von Balin, tab. 



2, fig. 7. 



Length 20 mm. Breath 15 mm. 



Shell i^yramidal, acute; whorls eight, concave; last whorl 

 with a double tuberculate keel; base rather concave, rising 

 rapidly towards the umbilicus. Mouth trapezoidal, differing in 

 form from that of Goldfuss' figure, which I deem to be erroneous 

 in this respect. There is an open umbilicus in some specimens. 



Brauns (Mittel-Jura. p. 181) unites this species with Turlo 

 subdu^licatus, D'Orb., from the TJ. Lias. Laube also seems to take 

 the same view. T. Thouetensis, H. and D. (Bull. Soc. Linn, de 

 Norm. V. p. 212) is probably only a synonym also. 



There are fourteen specimens in the Museum. 



Localities — Dundry and Yeovil. Inf Ool 



TROCHUS ZETES, D'Orbigny. PL 2, fig. 7. 



1850 T. Zetes, D'Orb. Pal. fr. Terr. Jur." 2, Gast. pi." 



316, figs. 1—4, p. 281: 

 Syn? 1850 T. Mosoe, D'Orb. Pal. fr. Terr. Jur. 2, Gast. pi. 



320, figs: 5—8. 

 There can be little doubt about this identification: 



