Plate 55. 



Fig. 1. Cheirastcr tripldciuithiis, type; twelfth and tliirteentli superomarginal 

 plates showiiiii the transverse series of 3 spines, and (,r) the enlarged 

 accessory siuniile, X 8. la. Same; fourth and fifth inferomarginal 

 plates, and sixth to eighth adanibiilacral plates, X 6.5. P. 205. 



2. Cheiraster ludicigi, type ; sixth inferomarginal and ninth and tenth 



adanibulacral plates, X 6.5. 2a. Same ; abactinal plates, X 9.6. 

 P. 203. 



3. Benthopccten styracius, type; fourth supero- and inferomarginals, and 



seventh and eighth adanibulacral plates, X 6.5 3a. Same; abactinal 

 plates, base of ray, X 9.6. P. 213. 



4. Benthopccten polyctenius, type ; third, fourtli, and fifth inferomarginals, 



the fifth superomarginal (svp.), and the eighth and ninth adanibu- 

 lacral plates, the eighth without furrow spines, X 4. 4r/. Same ; 

 abactinal plates, base of ray, midway between two odd interradial 

 superomarginal plates, X 1.6. P. 211. 



5. Benthopccten moluccanus, type ; abactinal plates from radial region at 



base of ray, on a transverse line between 2 odd interradial supero- 

 marginals, X 6.5. 5o. Same, cotype; third inferomarginal, and sixth 

 and seventh adanibulacral plates. X 6.5. 5b. Same, type; fourth 

 superomarginal, and adjacent alinctinnl ])lates, X 6.5. P. 208. 

 602 



