Tlate 21. 

 1-9. Salenia varispina A. A;^. 



1. Specimen measuring 1.9 mm. iu diameter, seen from the actinal side; oif Dou. 



Headed Shot Keys, 315 fms. ■» 



2. The same, seen Irom tlie abactinal side. 



3. The same, in profile, facing the left posterior interambulacrum. 



4. Buccal plates of the right posterior ambulacrum of the same specimen. 



o. The odd anterior ambulacrum of the same specimen, with 5 and 4 ambulacral plateaaj 

 4 primary interambulacral plates. 



G. The odd anterior ambulacrum of a specimen measuring 5 mm. in diameter, wWJ 

 and 6 primary interambulacral plates ; " Blake '" Exp. Station 288, off Barl 

 399 fms. 



7. Kight anterior genital plate of same specimen as fig. 1, from the exterior ; the poref| 



the madreporic body are not yet developed. 



8. Inner view of the same plate as fig. 7. 



9. Anal system of same specimen as fig. 6. 



