Plate 154. 



Fig. 1. Craicrohr'iHinfia (iicorjiiK : - ndainlmlacnil plates from outer third of 

 eostal area ; tlie proximal Dlate with sheath of pedicellariae shown 

 on the 2 proximal furrow spinelets and on the larger subambulacral 

 spine, X 5. la. Same; fifth adamhulacral plate, showing the special- 

 ized subambulacral spines, X 5. 1h. Same; mouth plates, X 5. Ic. 

 Same, a suboral spine from another specimen with the sac- 

 culus of pedicellariae, X 5. 1(7. Same; a pcdieellaria (length, 0.21 

 mm.) from a furrow spinelet, X 160. le. Same; distal articulating 

 surface of ambulacral and adamhulacral plates as seen on periphery 

 a disk after removal of ray. X 5; to the left an interradial plate has 

 been shown (int.). P. 514. 



2. Astrostephane iiioJiircdiKi ; same view as Ic, without an intermediate plate, 



X 5. 2a. Same; 2 adamhulacral plates, middle of costal area, X 5. 

 2b. Same ; mouth plates, showing the suboral spine bent toward the 

 actinostome, X 5.6. 2e. Same ; a suboral spine from the side, X 5.6. 2d. 

 Same; tip of pedicellaria (2r) showing inside of jaw. 2c. Same; a 

 pedicellaria from a furrow spinelet (length, 0.15 mm.), X IGO. P. 526. 



3. Freycllastcr spatnUfer, type; mouth plates and adjacent pair of adan)bu- 



lacrals, showing variation in the form of the first subambulacral spines 

 and the bifid suboral, X 9.6. P. 53S. 



4. Brisingencs anchista ; distal articulating surface of ambulacral and 



adamhulacral plates as seen on the periphery of disk after removal 

 of ray; on the right 2 adaml^ulacrals of adjacent rays are shown. 

 P. 521. 



701 



