Note on Botryocrinus pinnulatus, 193 
Arms are preserved to a length of 85 millim. ; they probably 
reached at least 90 millim. ‘Thus they were more than ten 
times the height of the cup, and this suggests that the arms 
of the type specimen were longer than was thought. The 
arms agree in essential structure with the type specimen, but 
throw some light on the peculia- 
rities of branching described for 
that specimen. ‘The axial canal 
exists as a mere tongue from the 
ventral groove in all the arm- 
ossicles, in which respect this 
specimen appears to differ from 
the type, if the appearances pre- 
sented by that specimen were 
correctly interpreted. The cover- 
ing-plates are numerous and 
minute, and appear to be slightly 
irregular in arrangement. 
I Br, in the two arms seen, 
number 4 and 7, and average 3 
millim. in both height and width. 
II Br, is axillary and gives off 
on its outer side a long armlet. 
The widths of the main arm- 
branch and the armlet, at the 
poimt where the latter originates, 
are respectively 2°5 and 1°5 
millim.; in other words, the arm- 
let is 2 the width of the main 
branch. The length of the armlet 
appears almost to equal that of 
the main branch, and it appears 
to have borne smaller branches 
or pinnules. (Fig. 3.) 
Lhe structure just described pig 3 Part of Anterior Arm of 
suggests that some at least of 
the secondary arm-branches in 
the type specimen are not ab- 
normal after all, but that the 
species does normally branch, 
in some or all of its arms, on 
Ii Br,. In this respect, then, 
Mr. Madeley’s specimen of 
Botryocrinus —_ pinnulatus ; 
showing the — secondary 
branching, and indications of 
the pinnules; very slightly 
diagrammatized. (x 2diam.) 
B. pinnulatus would resemble those American species of 
Barycrinus to which allusion was made (loc. cit. p. 405), 
differing from them, however, inthe facts that there may be 
four arms to a ray, not merely three, and that the anterior 
