60 ART. 2. — H. MATSUMOTO : 



developed between the oral angles and the interbrachial 

 ventral surfaces. 

 a. Madreporite single. 



Astroconus Dodeelein, 1911. 



Gorgonoceplialus Leach, 1815. 



Astrodendrum Dodeelein, 1911. 



Astrocladus Veeeill, 1899. 



Astrospartus Dodeelein, 1911. 



Astroboa Dodeelein, 1911. 



Astrophyton Müllee <k Teoschel, 1842. 



Astrochalcis Kœhlee, 1905. 



Ophiocrene Bell, 1894. 

 h. Madreporites five. 



Astrogordius Dodeelein, 1911. 



Astrooyclus Dodeelein, 1911. 



Astrocaneum Dodeelein, 1911. 



Astrodactylus Dodeelein, 1911. 

 Subfamily 2. Astrotomînœ Matsumoto, 1915 : — Teeth and 

 dental papillae similar, spiniform ; oral papillao very rudimentary or 

 entirely absent ; oral angles strongly projected ventrally ; genital 

 slits rather large, long, extending nearly from the inner corners of 

 the interbrachial ventral surfaces to the disk border ; basal vertebrao 

 very small, distinctly narrower than those just beyond, covered 

 over by the muscles lying between the basal vertebrae and genital 

 plates ; arms simple or divided a few times ; weU-developed sup- 

 plementary plates present in the spaces between the oral angles 

 and the interbrachial ventral surfaces. 

 a. Arms simple. 



Astrothamnus Matsumoto, 1915. 



Astrothrombus Claek, 1909. 



