APPENDIX. 347 



Asterogonium (restricted.) 



Body pentangular, flat above and below. 



Back or oral surface protected by irregular ossicules, 

 each covered with numerous erect cylindrical truncated 

 tubercles, or granules, those of the oral surface largest. 



Margin strengthened with regular oblong four-sided 

 ossicules, covered with small regular granules, except on 

 the most convex part of their centres, those of the upper 

 and lower series opposite each other. 



Dorsal wart single. 



Ambulacra with cylindrical truncated spines, in groups of 

 four on each ossicule of equal size not forming a rounded 

 group, and with a series of similar rather larger spines on 

 their side, and a series of small ossicules with terminal 

 granules on their outer sides. 



Bilabiate slit, none on either surface. 



Messrs. Muller and Troschell have proposed a genus 

 under this name, which I have here restricted to smaller 

 limits ; to distinguish the species more accurately I have 

 described all we have in the Museum. 



A. — Body flat, five-sided, granules short. Ossicules 

 flat-topped, not tubercled. 



Asterogonium miliare, n. s. 



Flat, dark red, pentangular, rays rounded at the end, 

 about one-third the length of the diameter of the disk. 



Margin rounded, ossicules -§# or §§ on each side, 

 covered with uniform close granules. 



Dorsal ossicules, rather convex, covered with uniform 

 granules. 



Inhab. — New Zealand. 



Like A. granulare in form, but the margin is round, and 

 the marginal plates are more numerous. 



