572 MR. C. STEWART ON THE CIDARID.E. 



DESCRIPTION OP PLATE LXX. 



Fig. 1. Portion of buccal membrane of Dorocidaris papillata. The tips of the five teeth are seen in the 



centre. The spines have been removed from one side to show tbe ambulacra and the absence of 



actinal cuts and external branchiae. X 14 diameters. 

 Fig. 2. Internal branchia of D. papillata. x 8 diam. 



Fig. 3. D. papillata, having upper half removed to show jaws and internal branchiae : slightly enlarged. 

 Figs. 4 & 5. Internal and side views of two jaws of an armed pedicellaria, showing perforation of terminal 



fang, x 80 diam. 

 Fig. 6. Portion of ambulacrum of Cidaris tribuloides from near buccal membrane, showing vertebral 



processes, x 12 diam. 

 Fig. 7. Side view of portion of an ambulacrum from near buccal membrane. Phyllacanthus baculosa. 



X 12 diam. 

 Fig, 8. Portion of genital gland of D. papillata. x 60 diam. 



