350 APPENDIX. 



fossil species found in the chalk belonged to this genus, but 

 the surface of the ossicules of most of the specimens I have 

 seen shew, from the scars with which their surface is covered, 

 that they are covered with granules, therefore they rather 

 belong to the restricted genus Aster ogonium, 



A. — In some species of this genus the ossicules of the oral 

 disk are more or less entirely covered with crowded flat- 

 topped granules. 



Tosia grandis, n. s. 



Dorsal ossicules very unequal, flat-topped ; marginal 

 ossicules ±± or -±£ on each 5 sides rather convex. The 

 ossicules of the oral surface are furnished with two or three 

 rows of crowded granules, and those near the ambulucra are 

 most covered. 



Inhab. — Western Australia. 



Lincke^ under the name of R. regularise t. 13./. 22. 22. 

 copied. E. M. t. 96. and Seba s Hi. t. S.f. 4. figures a species 

 like the above, but it only has ten marginal plates. Muller, 

 who thought he examined Lincke^s specimen at Leipsic, 

 describes it as having seven upper and five under marginal 

 plates. 



Tosia aurata t n. s. 



Golden yellow ; dorsal ossicules flat-topped, the five in the 

 centre between the central lines of the arms largest and 

 round, the marginal ossicules \% or }f , rather convex and 

 nearly equal, (that nearest the top not being longer than 

 the others) ; the ossicules of the oral disk all, except a few 

 in the middle of each, are entirely covered with flat-topped 

 granules. 



Inhab. — Australia. Brit. Mus. 



B. — In others the ossicules of the oral surface are only 

 edged with a single series of granules, like those of the back. 



