VITL. Cyathocrinus. Fin: 
DRAWINGS TO ILLUSTRATE THE MORPHOLOGY OF 
CYATHOCRINUS. 
1. ‘Ihe dissected cup; with the anterior radius on the right. 
2. Longitudinal median section through ten columnals of C. acinotubus. 
s, stereom of ossicle; m, matrix filling axial canal; c¢, calcite 
taking the place of former ligament. 
3. ‘Transverse section through the stem of C. acinotuhus. Lettering as 
above. Figs. 2 and 3 are both reduced from camera-drawing's 
of i 6004 B.M.; x 5 diam. 
4. Transverse section through a brachial (IIL Br) of C. acinotubus. Br, 
bedy of the ossicle; av, axial canal; vy, ventral groove ; ep, 
covering-plates. Reduced and restered from camera-drawings 
of E 1367, B.M.; x 8 diam. 
. A young individual of C. acinotubus (?). The extreme length of some 
of the brachials may be only apparent and due to the difficulty 
of seeing the sutures; it is, however, noticeable in the young of 
other genera. From an original drawing of M.P.G. vii|,4; ; nat. 
size. 
5a. A first primibrach of the same, showing that the axial canal is not 
yet separated from the ventral groove; X 3 diun. 
6. Ventral surface of the calyx of C. planus with ambulacrals and inter- 
ambulacrals removed. A, deltoids, and M, madreporite ; these 
surround the peristome, and on their edges are seen indentations 
for the reception of the ambulacrals; 2, anal. From Ii 6007, 
B.M.; x 2 diam. 
7. Ventral surface of the calyx of C. mammillaris, Phill., with tegmen 
complete. A, deltoids, in great part covered by ta, interambu- 
lacrals ; cp, covering-plates, which are irregular; «, anal, which 
is partly broken. Krom a drawing by Mr, Hollick of E 28s, 
B.M.; nat. size. 
ou 
