ECHINODERMATA — CLARK. 555 



of which carry pedicellarise ; five pairs of rather small buccal 

 plates. Teeth strongly notched on each side of sharp tip. 

 Primary spines all broken, slender, hollow, finely ridged longi- 

 tudinally and covered with crowded whorls of minute teeth. 

 Secondary spines very slender, acicular. Pedicellariaj of two 

 kinds, triphyllous and tridentate ; former rather scarce, very 

 small, heads only about -23 mm. in length, ends of valves trun- 

 cate, sides nearly parallel ; tridentate common on all parts of test, 

 except bare abactinal interambulacral spaces, very variable in 

 size, heads ranging from 20 to 50 mm. in length (one much larger 

 (PL Ivii., fig. 8) but not fully developed was found) ; neck about 

 as long as head ; valves slightly curved, widened and distinctly 

 hooked at tip; apophysis rounded, I'ather conspicuous; one 

 example of what Mortensen calls a claviform pedicellaria was 

 found (PI. Ivii., fig. 2), but it had no valves, and it seems to me 

 doubtful whether it is a pedicellaria at all. Colour of specimen 

 dried from alcohol, test abactinally, pui'plish-brown; tubercles, 

 greenish-yellow; a similar tint on outer part of interambulacral 

 plates; a deep blue line, over a millimetre wide, runs on abactinal 

 surface from second interambulacral plate to ambitus, along 

 midline of each column of interambulacral plate. Primary spine* 

 greenish or lavender. Actinally, both test and spines are very 

 light brown. 



1 specimen from Station 41. Off Wata Mooli, 52-71 fathoms; 

 soft mud. 



I specimen from Station 58 (?). Off Wata Mooli, 28-42 

 fathoms ; fine sand to mud. 



The discovery of a Chcetodiadema off the Coast of New South 

 Wales extends the range of the genus far to the southward. 

 The type-species {gramdalum) was originally described from the 

 Gulf of Siam, and has been taken also at various stations in the 

 East Indies as far south as New Guinea and at the Maldive 

 Lslands; the second species (j'«jt)o«ici<??i) is known only from Japan; 

 and the third (pallidiim) only from the Hawaiian Islands. The 

 Australian species is nearest japonicum, having the same con- 

 spicuous abactinal blue stripes as that species ; it differs from it, 

 however, in the general coloration, in the arrangement of the 

 tubercles, and in the tridentate pedicellariee ; the latter are much 

 like those of grannlatuvi. 



ASTHENOSOMA THETIDIS. 



Asthenosoma thetidis, H. L. Clark, Bull. Mus. Comp. Zool., Hi., 

 1909, p. 134. 

 Twelve specimens from Station 56. Off Botany Bay, 79-80 

 fathoms ; sand and stones. 



