PLATE VIIb. 
The Lettering is the same in all the Figures. 
A. Axial cord of ray or arm, ZL. Interradial ligament. 
a’. Its branches. | 1. Basiradial ligament. 
B, Basal ring. li. Interarticular ligament. 
B,. First brachials. R,. First radials. 
ai. Primary interradial cords, Id. Dorsal ligament. 
C. Coelom or body-cavity. | R,. Second radials, 
c. Network of connective tissue within the coclom. | R;. Third radials. 
cco. Interradial portion of the circular commissure. re. Rectum. 
ch. Cavities of the chambered organ, | rm. Muscles uniting the first and second radials. 
Sg. Fore-gut. V. Vascular axis of stem. 
G. Gut, | x. Plexiform gland, 
BATHYCRINUS ALDRICHIANUS, Wyv. Thoms. 
Fig. 1. Vertical section of the calyx, with the lower part of the disk, 
Fig. 2. Horizontal section of the basal ring, . 
Fig. 3. Horizontal section of the calyx at the level of the basiradial 
suture, 4 : : 7 - a - 
Fig. 4. Horizontal section of the radial pentagon at the level of the 
circular commissure, 
Fig. 5. Horizontal section of the calyx, through the articulation of the 
first and second radials, 
6.1 Horizontal section of the calyx, through the upper part of the 
second radials, ; 
g. 7.2 Horizontal section of the calyx, through the middle of the 
third radials, 
g. 8. Horizontal section of the disk, through the articulation of the 
first and second brachials, 
1 Tn the upper part of this figure a should be a’, as in the lower part. 
2 On the left of this figure / should be L. 
Diam. 
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