200 Zoological Society. 



This species is very like Tosia austratis, but is at once known 

 from it by the granules covering the greater part of the surface of 

 the marginal ossicules. 



ASTROGONIUM MILIARE. & f f) 



Flat, dark red, pentangular ; rays rounded at the end, about one- 

 third the length of the diameter of the disc. Margin rounded, ossi- 

 cules J-£ or f-f on each side, covered with uniform, close granules. 

 Dorsal ossicules rather convex, covered with uniform granules. 



Inhab. New Zealand. 



Like A. granulans in form, but the margin is round, and the mar- 

 ginal plates are more numerous. 



ASTROGONIUM INJSQUALE. fe^T*!^*' 



Pentagonal, sides rather concave. Arms acute. Dorsal ossicules 

 rather convex, covered with small roundish granules. Marginal 

 ossicules J- on each side, the two central ones small, narrow ; four 

 others large, convex, the two at the tip very small. 



Inhab. New Guinea? or Amboina? Capt. Sir E. Belcher. 



B. Back rather convex, the marginal and dorsal ossicules with a small 



central convexity or rounded tubercle ; the granules of the oral 

 surface rather elongate, rounded. 



ASTROGONIUM TUBERCULATUM. £T * I 



Body pentangular, sides concave ; arms rather produced, acute, 

 tapering ; the ossicules of the dorsal surface, of the upper and lower 

 marginal series, each furnished with a small, central, rounded tu- 

 bercle. Marginal ossicules J-f- on each side, the dorsal tubercles 

 on the middle of the back and down the centre of each arm rather 

 larger. 



Inhab. Port Natal. 



C. Body flat ; ossicules of the dorsal, marginal and oral surface en- 



tirely covered with rather elongated uniform granules ; marginal 

 ossicules small, erect, rounded above. . . 



ASTROGONIUM PAXILLOSUM. tT t\l 



Blackish (perhaps discoloured). Pentagonal, flat. Arm nearly as 

 long as diameter of disc, rounded at the end. All the ossicules of 

 the back, edge, and oral surface, covered with regular, uniform, 

 rather long, erect granules, forming a level surface ; granules of the 

 oral surface longest. The marginal ossicules narrow, erect, rounded 

 above. Ambulacral spines elongate. 



Inhab. Port Essington. 



This species, from the length of the granules, passes towards the 

 Astropectens, the elongated tubercles having much the appearance of 

 those which are called paxilli in that genus. j ' » 



Pentagonaster DiiBENi. \r "* \ 

 Body flat, five-rayed ; rays two-thirds the length of the diameter 



