Plate 54. 



Fig. 1. Prcti)i(ist(r Jnilm-diitJi iis. \\\)v: fourth nutl lif'tli adainbulacral. :r.vl third 

 and fourth inforomargiiial pUites. P. 187. 



2. Prciinastcr nihuiciis palairaitcitsi.s, cotypo ; fifth and sixth adaniliuhicral 



phites and adjacent third and fourth inferouiarginal platos ; between 

 the latter, a superonuirginal plate and spine (.s(//).), X 6.5. 2a. Same; 

 abactinal plate and central s[iinule, from nnddle of ray of the type. 

 X 16. P. 185. 



3. Clicirastcr gazellac ; thirteentli and fourteenth adambulacral, i^nd seventh 



and eighth inferomarginal plates. X 0.5. 'An. Same; paxillae from 

 edge of papularium, X 9.6. P. 190. 



4. Cheiraster 7iiasiciis; abactinal plates or paxillae from midradial line, 



near base of ray. 4a. Same ; tenth inferomarginal, and adjacent four- 

 teenth and fifteenth adambulacral plates, X 6.5. P. 192. 



5. Cheiraster d'wmedeae, type ; fifth inferomarginal, and seventh and eighth 



adambulacral plates, X 9.0. 5«. Same; twelfth superomarginal and 

 adjacent Inferomarginal seen from side ; note the intermarginal pedi- 

 cellariae, X 9.6. 5&. Same; abactinal paxillae from interradial region 

 of the disk, X 12. 5f'. Same; abactinal iilatcs fixim end of second 

 third of ray, X 12. P. 200. 



601 



