370 MR. CHARLES STEWART ON THE SPICULA 
DESCRIPTION OF THE PLATES. 
Prate XLVII. 
Fig. 1. Portion of ovarian tubes, Cidaris grandis. 
Figs. 2, 3. Extremities of ditto, showing terminal and connecting fibrous bands. 
Fig. 4. Extremity of ovarian tube, Cidaris ? 
5. Spicula from ovary of Cidaris tribuloides. 
6. Fringe of spines along the inner border of the intestine of Cidaris grandis (in situ). . 
Fig. 7. Spines from the mesenteric border of ditto. 
8 
9 
. Spines from the inner border of ditto. 
a. Spine from mesenteric margin of Cidaris ——?; b, from inner border, showing its solid 
axis. 
Fig. 10. Spines from interradial membrane at the base of the lantern of Cidaris tribuloides. 
PLATE XLVIII. 
Fig. 1a, 6. Different portions of intestine of Cidaris grandis (spicula in situ). 
Fig. 2. Ditto Cidaris ? 
Fig. 3. Ditto Cidaris tribuloides. ; 
Fig. 4. Portion of mesentery of Cidaris ? (spicula in situ). 
Fig. 5. Ditto C. tribuloides. 
Fig. 6. Superficial layer of spicula from the mesentery of C. tribuloides. 
Fig. 7. Spicula in situ from free inner membrane of C. tribuloides. 
Fig. 8. Ditto Cidaris ? 
Fig. 9. Plate from interradial membrane of Cidaris — ? 
Fig. 10. Spicula of external oblique ligament of lantern of Cidaris —— ? 
Fig. 11. Spicula from an ambulacral tube of C. tribuloides. , 
Fig. 12 a. Ditto from ambulacral tube of oral surface of Cidaris from Malta; b, ditto from dorsal 
surface. 
Fig. 13. Spicula of the intestine of Goniocidaris geranoides (in situ). 
Fig. 14. Spicula from its inner border. 
Fig. 15. Spines from border of intestine. 
Fig. 16 a. Spicula from ambulacral tubes ; b, from ovary. i 
Fig. 17a. Spicula from ambulacral tube of Diadema; b, from internal membrane near the anus 
(in situ). 
Fig. 18a. Spicula of intestine of same Diadema ; 6, ditto Diadema from China. 
PLATE XLIX. 
Fig. 1. Spicula from the ovary of Echinometra (D. 153 Royal Coll. Surgeons). 
Fig. 2. Ditto Echinometra, Wh. 
Fig. 3a. Spicula of intestine ; 4, inner margin; c, mesenteric band of Echinometra, D. 153 (in situ). 
Fig. 4a, b. Spicula of different parts of the intestine of Echinometra, Wh. (in situ) ; c, from mesentery. 
Fig. 5 a. Spicula of intestine; 5, inner border (in situ) ; c, from mesentery of Echinometra, Ol. 
Fig. 6a. Spieula of ambulacral tube of Echinometra, D. 153; b, ditto Echinometra, Wh.; c, Echi- 
nometra from China, d, E. Ol. 
