75 



and not angular; it is in several respects intermediate between 

 Culcita and Pentaceros. 



Randasia granulata, n. s. 



Body five-sided ; back minutely granular, with roundish convex 

 subconical tubercles in tbe reticulations ; the marginai platės four- 

 teen on each side, the upper ones with a centrai series of tubercles. 



Inhab. Reefs of Attagor, Torres Straits. 



There are two specimens of this species in the British Museum, 

 one in a very bad stata. 



Randasia spinulosa, n. s. 



Body five-sided; back and upper marginai platės covered ■with 

 numerous small, conical, acute spines, Mvithout any larger tubercles ; 

 the upper marginai platės indistinct. 



Inhab. } 



This species is very likę the former in shape, size and appearance, 

 but is very easily known from it by the numerous mobile acute spines 

 with which the back and upper part of the margin are covered, ap- 

 pearing to take the places of the small granulations, and by the 

 absence of the tubercles on the elevated ribs of the back. 



ASTERODISCUS. 



Body pentagonal, coriaceous, depressed, covered with numerous 

 close, flat-topped, uneąual, small tubercles ; back convex ; dorsal wart 

 roundish, subcentral ; arms short, rounded, with a pair of large con- 

 vex kidney-shaped ossicules on each side of the tip above. Margin 

 simple, rounded, beneath concave ; ambulacra with a series of short 

 linear spines, placed in groups of four or five, each group on a separate 

 ossicule, and with two series of larger, blunt, club-shaped spines on 

 the outside of the ambulacral spines. The young specimens have 

 indistinct inferior marginai ossicules. 



ASTEEODISCUS ELEGANS. 



Pale brown when dry ; tubercles of the back uneąual, the larger 

 ones truncated, those nearest the mouth on the underside larger, 

 club-shaped, rather crowded, 



Inhab ? Brit. Mus. 



Pentaceros granulosus. 



Five-rayed ; rays as long as the diameter of the disc, rounded at 

 the tip. Back rather convex. Ossicules convex, rounded, all covered 

 ■vvith close rounded granules, the two or three centrai ones on the 

 top of each ossicule being larger, those on the middle of the back 

 largest and subtubercular. The marginai ossicules convex, rounded. 



Inhab. Westem Australia. 



Young ? Arms more slender, and the lower marginai ossicules 

 near the tip of the arm each with a group of two or three spines, 

 the one nearest the tip largest. 



The dorsal surface of this species is furnished with abundance of 

 pedicellaria, one arising from each hole betvveen the ossicules. 



