Plate 13 



Details of the actinostomial ring of various Coscinasteriinae with especial reference to the 

 odontophore (0) and the first ambulacra] {A). The segment of the ring is viewed directly from 

 above and the month plates are dotted to show their extent. 

 Fig. 1. Astrostole scrabra ■ 5. 



2. Sclerasterias heteropaes Hi (station 3110). 



3. Coscinxsterias calamaria, No. 1872, M. ('. Z., Port Jackson, New South Wales, X5. 3« 



Same, No. 1881, M. C. Z., Dunedin, New Zealand, ■ 10. These two figures show the 

 wide variation in the odontophores which are frequently very irregular, sometimes 

 with one, two, or several articulation points for the crowded interbrachial plate-. 



I Coscinisterias acutispina, No. L182, M. C. Z.. Japan, ■ 5. to. Coscinasterias lenuispina, 

 No. 2133, M. ('. '/.-. Bermuda, ■ 10. These two figures are intended to show the 

 broader first ambulacral plates of subgenus Stolasterias and the less variable odonto- 

 phore with articulation p lint for the interbrachial septum. 



5. Distolasterias nipon, Hokkaido. - 10. 



(i. Marthasterias glacialis, No. 1261, M. C. Z., Fayal, ■ 10. 



7. Meyenaster gelatinosus, No. 1256, M. < '. '/... Talcahuano, Chile. 

 204 



