Echinoid Radioles. Anaulocida.ris. 
157 
Text-fig. 32. 
Greatest thickness.... 
. . 2-3 
Thickness in median line . 
. . 2-2 
Actual length. 
. . 197 
Estimated length .... 
. . 21 0 
Greatest width. 
. . 7-4 
Width of annulus .... 
. . 2-8 
Thickness of annulus . . 
. . 2’4 
From the Stuores Mergel, St. Cassian, ex Coli. Klipstein. 
- 2‘8 thick 
Width of annulus . . 4'2 
Thickness of annulus . 27 
Numbered «D. 57». St. Cassian, zone of Trachycevas Aon. 
(BM) In the British Museum. 
from base 
» » . . 2‘3 thick 
» » . . 3'3 » 
» » 
Text-fig. 34. 
Width of annulus. 4‘6 
Thickness of annulus. 3'3 
Height of collerette from annulus . . ca. 1'9 
Registered E 9348. From St. Cassian Klipstein 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) 
Text-fig. 35. 
Width of annulus.3'9 
Thickness of annulus.3'0 
Height of collerette from annulus 2 - 9 
Registered E 9349. From St. Cassian. Klipstein Collection. Note the curve 
of the collerette. 
c) 
Text-fig. 36. 
Width of annulus.4’0 
Thickness of annulus .... 27 
Height of collerette from annulus 1‘8 to 2 6 
Registered E 9350- From St. Cassian. Klipstein 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 shovvs 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 
