BY REV. J. E. TENISOX-WOODS, F.L.S. 283 



of the diagnosis. These will show how very much there is yet 

 to be discovered on the Australian Coast. At the conclusion of 

 the paper I give a revised list of the Australian Echini known 

 to me, both recent and fossil. 



Hemiaster (Khyxobrissus, Agass). 



Test thin, easily separating into hexagonal plates, outline 

 somewhat angular, vertex not central, odd ambulacrum flush 

 with the test. Three independent fascioles, viz., peripetalous, 

 anal, and subanal. Primary tubercles with a raised, flat, 

 scrobicular circle. Spines of abactinal surface short, silk-like, 

 curved ; actinal surface long, curved. Posterior lateral ambulacra 

 passing gradually into the actinal surface. 



Hemiaster (Khyxobrissus) apicatus. n. s. 



Test thin, outline from above broadly oval, greatest breadth a 

 little below the lateral ambulacra. Vertex anterior a little above 

 the lateral petals. Seen in profile the test is high, swelling 

 roundly outwards for a little way above the anterior ambitus 

 and then slightly receding to the high vertex, whence it slopes 

 very gently, forming a level or almost level elevated ridge to the 

 anal edge, where it is truncated in outward direction to the 

 subanal fasciole, where it slopes inwardly forming an obtuse 

 angle in the middle and terminating in a point at the ambitus. 

 The anal system is an oval shallow depression in the rounder 

 posterior extremity. The opening is vertical, oval, pointed at 

 each end. Prom regular points at each side ridges extend to 

 the surrounding fasciole where they terminate in small round 

 protuberances. Immediately below this is the subanal fasciole 

 enclosing a broad almost orbicular subanal plastron which is 

 closely covered with secondary tubercles, rather larger, more 

 crowded, and with a well defined scrobicular circle in the lower 

 part. The anal fasciole is narrow, with a wavy inner edge and 

 scarcely apparent above the opening. The subanal fasciole is 



