PLATE XVIII. 



Choriaster granulatus. 



2G4. Abactiiial view, x 0.9. 



265. Actinal view, x 0.9. 



266. Mouth angle, x 4. 



267. Tliree adambnlacral plates and adjoining parts, x 4. 



268. Jaw of an adamlnilacral j)edicellaria, after treatment witli 



canstic potasli. x 90. 



269. Madreporite. The right side is the outer, x 4. 



Gynmasteria carinifera. 



270. Abactinal view. Slightly reduced. 



271. Actinal view. Slightly reduced. 



Asterina pectinifera. 



272. Abactinal view, x 1. 



273. Actinal view, x 1. 



