232 A. E. Verrill — Revision Genera and Species of Starfishes. 



Figure 3. — The same species. Group of abactinal plates from the central part 

 of the disk of a smaller specimen, showing several peclicellarife {p) in dif- 

 ferent positions, x about 24. 



Figure 4. — The same specimen. Dorsal side of the distal part of a ray. +5^4. 



Figure 5. — The same specimen. Actinal side of one of the jaws and adjacent 

 parts. X 53^. 



Figure 6. — The same species. A young specimen (No. 18,459), like that described 

 as P. parvus by Perrier. Dorsal surface, x 7. 



Figure 7. — Nymphaster ternalis (Per.). Dorsal side of a part of the disk and 

 base of a ray. The granules have been partly removed from some of the 

 marginal plates, and entirely from some of the abactinal ones, x 5)^. 



Figure 8. — Mediaster Bairdii Ver. Part of the abactinal system of plates from 

 the base of a ray and a part of the disk, seen from the inner side, showing 

 the bases of the paxillce with the radiating ossicles that connect them 

 together, and the intervening papular pores. On the right ai-e some of the 

 interradial plates without papular pores between them, x 93^. 



Figure 8a. — The same. Abactinal paxillae from the papular region. 



Plate XXVII. 



Figure 1. — Tosia (Plinthaster) nitida Ver. Type. Dorsal view of a part of the 



disk and a ray. x 5)^. 

 Figure la. — The same specimen. Actinal side, x 6. 



Figure lb. — The same specimen. Abactinal plates of a papular radial area, x 6. 

 Figure 2. — Tosia (Plinthaster) coinpta Ver. Type. Actinal side of the base of a 



ray. x Sj^. 

 Figure 3. — Pyrenaster dentatus (Per.). Oral region of specimen No. 18,433. x5J^. 

 Figure 3a. — The same. Dorsal surface of one of the rays of No. 18,433. Variety 



with wider abactinal radial areas, x SJ^. 

 Figure 36. — The same sj)ecies. A younger specimen (No. 7079). Under side of 



a part of the disk showing the actinal and adambulacral plates. Two of 



the actinal plates have a bivalve pedicellaria. x 93^. 

 Figure 4. — Prionaster elegans Ver. Type. Under side of basal part of a 



ray. x 51^. 

 Figure 4o. — The same specimen. One of the jaws and adjacent actinal and 



adambulacral plates, showing the odd interradial series of actinal plates (hi) 



and the first of the paired series on each side, x 5I3. 

 Figure 4&. — The same specimen. Distal part of the upper side of a ray, with 



the apical plate, x 7. 

 Figure 4c. — The same. One of the dorsal paxillae. Much enlarged. 

 Figure 5. — Goniopecten devionstrans Per. Under side of part of a ray, middle 



portion, showing adambulacral and marginal plates in contact, x 5^. 

 Figure 6. — Plutonasfer Agassizii Ver. One of the jaws and adjacent parts of a 



specimen having pedicellariae. One of these, with four blades, is- situated 



on the first actinal plate in line with the dentary suture, x 7. 

 Figure 7. — Blakiaster conicus Per. Part of the actinal surface, showing two 



of the pedicellariae (p) with spiniform blades, x 14. 



