Plate 153. 



Fig. 1. AxtrostciiJidin ncdiitliot/cinis, tyiie; l^ adamlmliK rnl phitt^s from the costal 

 aivii : X 5. Im. Same; a lateral spine, same scale as fig. 1, from the 

 end of the costal area. X 5. lb. Same; mouth phites showing the 2 

 suboral spines of each ; one spine removed from left plate ; X 5. Ic. 

 Same; articulating surface of amhulacral and adambulacral plates 

 where ray has I»een broken from disk; this is the distal face of the 

 plates, X 5. Id. Same; a pedicellaria (length, 0.109 mm.) from one 

 of the furrow spinelets, X 200. P. 528. 



2. Steynobrmnffa placodcrrna. tyiie ; mouth plates and 2 adjacent adambu- 



lacrals, X 5. 2a. Same : end of one of the subambulacral spines show- 

 ing the sheath of pedicellariae. X 5. 2/;. Same; 2 adambulacral 

 plates from the costal region, X 5. 2c. Same : a pedicellaria from a 

 furrow spinelet (lenglh, 0.45 mm.), X GO. 2d. Same; articulating sur- 

 face (distal I of ambulacral and adambulacral plates as seen on 

 periphery of disk after removal of ray, X 5. I'. .531. 



3. Brisiiiffciics anchista, type ; pedicellaria from a subambulacral spine 



(length, 0.22 mm.), X 80. 3a. Same; a pedicellaria from disk (length, 

 0.27 mm.), X 80. '^It. Same; pedicellaria from a lateral oral spine 

 (length, 0.40). X 80. 3r. Same, station 5648; mouth plates, X 5, 

 showing the connnon sacculus of the 2 suboral spines. Sd. Same; 

 pedicellaria (length, 0.27 mm.) from a furrow spinelet, X 80. P. 521. 

 700 



