Fra. 
. Trochus Sandersii, 'V'awney. Murchisone-zone, Bradford Abbas. Back and 
bo 
9: 
PLATE XXXI. 
N.B. 1. All fiaures on this plate are drawn from photographs. 
N.B. 2. All specimens are from my Collection unless otherwise stated. 
N.B. 3. All figures are magnified a little over two diameters except fig. 16. 
front. (Page 370.) 
Trochus rupestris, sp. nov. Irony Nodule-bed (Murchisonx-zone), Burton 
Bradstock. Back. (Page 371.) 
. Trochus sybilla, sp. nov.  Opalinus-zone, Drympton. Back and front. 
(Page 371.) 
Trochus Winwoodi, Tawney, var. minor. Stoford (? Concavus-bed). Back 
and front. (Page 372.) 
. Trochus Winwoodi, Tawney, var. major. Concavus-bed, Bradford Abbas. 
Back and front. (Page 372.) 
Trochus spiratus, d’Archiac. Lincolnshire Limestone, Weldon. Front and 
back. (Page 378.) 
. Trochus spiratus, conical variety. Weldon. Back. N.B.—This specimen, 
like so many of the Weldon fossils, has suffered from attrition. 
. Trochus dimidiatus, Sowerby. Parkinsoni-zone, Woolston. Front and back. 
(Page 379.) 
Trochus Zetes, dOrbigny, as identified by Tawney. Concavus-bed, Bradford 
Abbas. Back and front. (Page. 379.) 
. Trochus duplicatus, Sowerby. Parkinsoni-zone, Burton Bradstock. Back 
and front. (Page. 373.) 
. Trochus angulatus, Sowerby [? var. of T. dwplicatus, Sow., cf. also T'. Loriert, 
@Orb.]. Parkinsoni-zone, Burton Bradstock. Back and front. 
(Page 374.) 
. Trochus Duryanus, @’Orbigny.  Parkinsoni-zone, Grove. Back and front. 
(Page 375.) 
. Trochus subduplicatus, d’Orbigny. Small form from the “Sands,” Brims- 
combe. Back. (Page 375.) 
. The same. Large form from the “ Sands,’’ Newton, near Yeovil. Front. 
. “ Trochus bicingendus,’ Lycett. Oolite Marl, Nailsworth. Jermyn Street 
Museum. Back. (Page 389.) 
. Trochus cf. Biva, @Orbigny. Base of the Lincolnshire Limestone, Lincoln. 
Front. xX 1}. (Page 388 ) 
