146 PROCEEDINGS COTTESWOLD CLUB (1908) 
CIDARIS ARIETIS (Quenstedt). Text-figure Ia. 
This appears to be one of the species of Czdarzs which 
occur so commonly in the “Czdaris-Shales” of Dr 
Vaughan and Prof. Reynolds,* which are probably of about 
marmoree hemera. ‘The radioles agree with Quenstedt’s 
fig. 8, tab. 5, in his “Der Jura” (1858). The Czdaris 
figured by Dumortier (“Lias de Bassin du Rhone,” 
2m partie, 1867; PI. xiv, figs. 10-13), also probably 
belongs to this species. 
a 4 e. 
Fic. 1.—1 a, basal portion of a radiole of Cidaris arie¢is (Quenstedt) ; 1 4, basal portion of a 
radiole of Cidaris sp. (both enlarged) ; 1¢, smooth radiole of Czdaz7s (nat. size). 
It has been recorded from the Czdarzs-Shales, railway- 
cutting near Chipping Sodbury, Gloucestershire; and 
definitely from deposits of marmoree hemera, at Farn- 
borough, in the Radstock district, Somerset; Froud’s 
Quarry, Bedminster, near Bristol; and Blue Anchor, near 
Watchet, Somerset. 
CIDARIS spp. 
The radioles of two other species of Czdarzs-occur in 
the MWarmorea-Beds. One of these is probably closely 
allied to Czdarzs artetzs (Quenstedt), but the radioles 
differ in having larger protuberances, which are placed 
farther apart than in that species. The basal portions of 
the radioles differ as shown in the accompanying sketches 
(text-figures Ia and I é.) 
1 Quart. Journ. Geol. Soc., vol. lviii. (1902), p. 720. 
