]\li-. ^V. K. Fislier — Notes on Asteroidea. 



591 



spineless j)latelets ; marginal skeleton weak ; superomavginals 

 well separated, connected hy a chain or festoon of small 

 secondary ossicles ; alternate superoinargiiials reduced in size 

 and spineless ; inferoniarginals diplacanfliid, spaced, some- 

 times connected hv 1 or 2 secondary small ossicles; abactinal 

 spines well spaced, and, liko tlie marginal spines, surrounded 

 by a conspicuous, tougli, retractile sheath expanded distally 

 (and bearing numerous small crossed pedicellarise), that of 

 the inferomarginals common to 2 spines; adambulacral 

 plates monacanthid, the s[)inelets without pedicellariie ; 

 mouth-plates broad, ■with 1 pair of enlarged postoral adambu- 

 lacral plates in contact on the interradial line ; crossed pedi- 

 cellariaj with a conspicuously enlarged tooth on one side of 

 the end of the jaw, 2 or 3 smaller teeth on the opposite side, 

 and very numerous small teeth on the shank. Straight 

 pedicellariaj small, lanceolate. 

 Type, the following species : — 



Lysastrosoma anthoslicta^ sp. n. (Figs. 1 & 2.) 



Rays 5. R=G3 mm., r = 9 mm., R=7r ; breadth of ray 

 at base 8 to 10 mm. Disk small ; rays marked off from 



FiR. 1. 



Lysastrosoma atithostida, X 10. Marginal and five abactinal plates, 

 from proximal half of ray ; base of ray to the right. 



a, a, a, abactinals ; *, «, s, spiniferous suporomarginals ; i', i, infero- 

 marginals; ad, adambulacrals ; secondary marginals shown 

 between the superomarginals. 



40^^ 



