79 



This species is very likę Tosia australis, but is at once known 

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

 the marginai ossicules. 



ASTROGONIUM MILIARE. 



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

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

 cules f§ or fl on each side, covered with uniform, close granules. 

 Dorsal ossicules rather convex, covered with uniform granules. 



Inhab. Ne\v Zealand. 



Likę A. granularis in form, but the margin is round, and the mar- 

 ginai platės are more numerous. 



ASTKOGONIUM IN^CIUALE. 



Pentagonai, sides rather concave. Arms acute. Dorsal ossicules 

 rather convex, covered with small roundish granules. Marginai 

 ossicules I on each side, the two centrai ones small, narrow ; four 

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



Inhab. Nev/ Guinea.? or Amboina? Capt. Sir E. Belcher. 



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



centrai convexity or rounded tubercle ; the granules of the orai 

 surface rather elongate, rounded. 



ASTROGONITJM TUBERCŪLATUM. 



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

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

 marginai series, each furnished with a small, centrai, rounded tu- 

 bercle. Marginai ossicides -|-| on each side, the dorsal tubercles 

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

 larger. 



Inhab. Port Natai. 



C. Body flat; ossicules of the dorsal, marginai and orai surface en- 



tirely covered with rather elongated uniform granules ; marginai 

 ossicules small, erect, rounded above. 



ASTROGONIUM PAXILL0SUM. 



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

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

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

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

 orai surface longest. The marginai ossicules narrovsr, 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 tlie appearance of 

 those -vvhich are called paxilli in that genus. 



PeNTAGONASTER DiiBENI. 



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



