PLATE XV. 



Oreaster niodestus. 



228. Abaotinal view, x O.S. 



•229. Actiual vi«sw. x 0.8. 



280. Tliree adainbnlacral plates, viewed from the furrow side. Tlie 



np]X3r side is the adceutraL x 4..5. 

 2.81. Fourth, fifth and sixtli adnmbnlacral plates with adjoining 



ventrolateral |>lates, viewed from the actiiial side. The 



nnder side is the adcentral. X 4. 

 232. Small ywrtion of an actinal interradius, near the mouth, x S. 

 238. Adamhulacrid pedieellaria, after treatment with caustic potash. 

 X 45. 



234. Adambulacral pedieellaria Avith three jaws, after treatment Avith 



caustic }X)tash. x 45. 



235. Al)actinal pedieellaria. X 45. 



236. Abactinal ]^edicellaria (valvate) with surrounding granules, x 5. 



Oreaster magnificus. 



237. Abactinal view, x 0.4. 



238. Actinal view, x 0.4. 



239. Mouth angle, x 1.5. 



240. Small portion of abactinal surface, carinal jiart. x 3. 



