EXPLANATION OF PLATE VIL 



(Figures 3-13 after Clark.) 



CiDARIS SPLENDENS (^Iiirtrm) p. 279 



1-2. Two \'ic\vs I'li a nearly complete test. (Illustrations con- 

 tributed by Dr. AV. B. Clark.) 



3. Piirtion of a te.st. 



4. Interambulacral plate (x2). 



5. Anibulacral area, highly ma,g"niried. 



6. Tubercle, enlar.ged. 



7. Spine. 



g. Ease of spine much enlarged. 



9. Articular surface nf spine, much enlarged. 



I'iiicciitO'icii liiucsaiid : J'inceiitozvn. 



CiD.\Ris WALCOTTi Clark, p. 281 



10. Portion of test, natural size. 



11. Literambulacral plates, enlarged. 



12. Anibulacral area, hi,ghly magnified. 



13. Tubercle enlarged. 



J'iiicciiti'i^'ii liiucsaiid: Vinccntoii'n. 



894 



