Plate S. 



Fig. 1. (loiiioiicctcii (i.sidlkiis ; interradial cTibifonu or^an of the type, showing 

 also 12 superoiiiarsinal ami 2 inferoinarginal plates with their spines, 

 xr>. ](/. Same; a cross-section of ray of tyi)(», talcen about n tliird its 

 leii.yth from base, to show I lie i-clatiim of i)lates. and cs|iccially the 

 massive marginals. X2.r). 1'. 47. 

 2: Bcnthogcnia i-rihcUosn : sixtli adambulacral ph^te of type, tlie adoral side 

 to left. X8. 2(1. Same; abactinal plates. X5. 2b. Same; one of the 

 largest radial paxillae, X8. 2c. Same; end of ray from side showing 

 the terminal plate, dorsal and marginal cribriform organs, X2.5. The 2 

 distalmost spines of the terminal plate are each paired ; the 3 proximal, 

 shown by scars, are unpaired. 2^/. Same; a smaller radial paxilla 

 from side, XI 2. P. 39. 

 3. I'rionaster andhxjiis ; fifth and sixth ndainlndaci-al plates, the adoral side 

 being to the right. The right-hand plate is shown partly dried in 

 order to bring out the form of the furrow spines; XS. 3a. Same; 

 a iiaxilla from al)out the middle of major radius, XIG. 3b. Same; 

 dorsal view of a terminal plate and 3 adjacent superomarginals of a 

 specimen from station 5565, X8. 3c. Same; ventral view of plate 

 shown in 3?*; an inforomarginal and 2 adanib\daci-nl ]ilates are shown 

 on I'itbcr side of llic tun'nw ; X8. P. •'")(•. 



