Echinoid Radioles. Anaulocidaris. 157 
b) ; Greatestithicknessh 9.) 1.7253 
Thickness in median line . . . 2°2 
ANE WUE Ways GB ag ee dle we USES 
Estimated@lensth . 92 = 4 . . 21:0 
GREE: Whit o 6 ots 8 oe tte! 
MWidthnorrannuluss sua sn seis 
Text-fig. 32. chicknesssofeannulus: 94). 2 0.) ait 
From the Stuores Mergel, St. Cassian, ex Coll. Kuipsrein. 
G) is i 
a Fe go Oe eck” Width of annulus’. . 4:2 
: Thickness of annulus. 2°7 
Text-fig. 33. 
Numbered «D. 57». St. Cassian, zone of Trachyceras Aon. 
(BM) In the British Museum. 
(ei) RE 12°5 from base 
—=-. 9:0 » » . . 2°83 thick \Wacakiln, ole euaronothesy 3 = 4 5 2 Ao 46 
Pee OP io Usteanearo) es iihicknesssoh annulusi.) ss sue enee Oro 
scons, (210 (P| s Height of collerette from annulus . . ca. 1°9 
Text-fig. 34, 
Registered E 9348. From St. Cassian Kuipstein Collection. The base of 
a massive remiform radiole, similar to RAW, a, but better preserved. This radiole 
cannot have been much less than 30 mm. long. 
b) Bl Widthvof annuluse!) 25 </file>. 13:9 
hickness of annulus; 2.9. 2 3:0 
Text-fig. 35. Height of collerette from annulus 2:9 
Registered E 9349. From St. Cassian. (Kirstein Collection. Note the curve 
of the collerette. 
c) =, Width of annulus. . .. . 40 
Thickness of annulus... . 27 
Text-fig. 36. Height of collerette from annulus 1°8 to 26 
Registered E 9350. From St. Cassian. Kupstew Collection. 
These specimens are so few and so incomplete that it is impossible to con- 
struct any curves. A comparison of the outline drawings with those of A. testudo 
at once shows the larger size of A. Buchi. The estimated lengths suggest that 
the ratio is about 3:2; but the ratio of the thickness is rather greater, that is to 
say the radiole of A. Buchi is relatively thicker in proportion to its length than is 
