APPENDIX. 343 



Young ? arms more slender and the lower marginal ossi- 

 cules near the tip of the arm, each with a group of two or 

 three spines, the one nearest the tip largest. 



The dorsal surface of this species is furnished with 

 abundance of Pedicellaria, one arising from each hole be- 

 tween the ossicules. 



Stell aster Incei, n. s. 



Purplish, minutely granular ; back with scattered conical 

 convex tubercles, those down the centre of the arm largest ; 

 the lower marginal plates are flattish. 



Inhab. — Cape York. 



This species is very like Stellaster Childreni, Gray, 

 Ann. and Mag. N. H. 1840, 278. Miiller Aster. 62, 128, 

 t. 4, f. 3. Asterias equestris, Retzius Diss. 12. But it is 

 purplish when dry ; the back is tubercular ; the whole sur- 

 face is minutely granular, while the Javanese species is 

 always white, the back smooth, and the granules of the sur- 

 face are so minute and thin, that they are very easily eroded, 

 and the lower marginal plates are more convex, and the 

 central ones much larger than the others. 



We have a third species of this genus from Borneo, which 

 differs in the arms, being larger and much more slender ; 

 the back with only 5 or 6 tubercules, but the whole surface 

 is minutely granular. It is named Stellaster Belcheri, 



Calliderma, Gray. 



Body flat, five-sided ; rays rather elongated ; attenuated 

 end only formed of the marginal plates, ossicules all mi- 

 nutely granulated. 



The dorsal ossicules flat-topped, six-sided ; some with a 

 larger globular tubercle-like granule. 



The marginal ossicules broad, gradually becoming 

 smaller near the tip, sharp-edged, minutely granular ; those 



