PLATE XVII 



Fig. I. Odinella nutrix, side view of base of ray of type, x 6; I-V, first 

 5 skeletal arches;/), papulae; 5 spines which had pierced the integu- 

 ment of adjacent ray, forming spine bridges as explained in text. 

 The end of these spines was forcibly withdrawn from the sheath 

 which has coalesced with the skin of adjacent ray and remains 

 attached thereto when rays are forcibly separated. The young is m 

 stage 5 and shows abactinal spinelets and well-developed terminal 

 sacculus. 



Fig. 2. Same. Immature specimen, St. 123, x 3, listed under "growth" 

 as 3. Two mysid shrimps are held by pedicellariae which have 

 grasped the numerous delicate bristles of their appendages. 



Fig. 3. Same. Type, base of a ray showing another young in stage 5 

 (figured pi. 16, fig. 11). Under this were several smaller young 

 (stage 3). The first skeletal arch was destroyed in removing ray; 

 s', sheaths from which spines of adjacent rays have been pulled; 

 other letters as in fig. i. 



Fig. 4. Notasterias stolophora, type, x 2-5. 



Fig. 5. Lethasterias australis, type, x 2-5. 



