f) F. JEFFREY BELL. 



Specimens were taken at Coulman Island, 100 fms. ; Winter Quarters, 100 fms. ; 

 East end of Barrier, 100 fms. 



This species is one that has lately been the subject of some dispute ; Prof Agassiz,* 

 who originally described it, suggests that it be placed in a new sub-genus Centrocidaris, 

 while Dr. Mortensen f finds it to consist of several species, bilt he does not appear to 

 be sure of the exact number. J 



echinidae. 



Echinus margaritaceus. 



Echinus margaritaceus, Lamk. An. s. V. iii. (1816), p. 47 ; Bell, Coll. 'Southern Cross' (1902), p. 219 



ilique citata ; Mortensen, Ingolf Echinoid. (1903), p. 101. 

 Echinus diadem.a, Studer, MB. Akad. Berlin (1876), p. 456 ; Al. Ag. Chall. Rep. Echin. (1881), p. 117. 

 Echinus horridus, Al. Ag. op. cit. p. 117 ; Mortensen, op. cit. p. 102. 

 Sterechinus antarcticus, Koehler, Echin. Voy. ' Belgica ' (1901), p. 8. 



This appears to be a circumpolar species, as I remarked when I reported on the 

 collections of the ' Southern Cross.' It was taken by the ' Discovery,' not only at 

 several dates in Winter Quarters, but at the East end of the Barrier Eeef, 100 fms. ; 

 at Cape Wadsworth, 8-10 fms. ; off Coulman Island, 100 fms. ; and South of 

 Antarctic Circle, 254 fms. 



Hemiaster cavernosus. 



Spatangus (Tripylus) cavernosus, Philippi, Arch. f. Nat. xi. (1845), p. 345. 



Hemiaster cavernosus, A. Ag. Rep. Ech. (1872), p. 132 ; Meissner, Ergebn. Hamburg Magalh. Sammelreise, 



V. (1900), p. 13 ibique citata; Bell, Coll. ' South. Cross' (1902), p. 219. 

 Alatus cavernosus, Loven, Bib. Svenska Vet. Akad. Hdlgr. xviii. 4, no. 1, p. 3. 



This species is not very well represented in this collection, and, curiously enough, 

 all the examples are males. 



If the late M. Bernard § was right in regarding Tripylus excavatus as a synonym, 

 the name of the species ought to be excavatus, as that was the first of the three species 

 described by Philippi ; for myself I am inclined to abide by Prof Agassiz's view. 



Taken at Coulman Island, 100 fms. ; Winter Quarters, 20 fms. ; and East end of 

 Barrier Reef, 100 fms. 



IV. ASTEROIDEA. 



The collection of starfishes was rather large, and contained some very fine 

 specimens ; but, as will be shown later, there is very great difiiculty in coming to 

 definite conclusions regarding them, and I have preferred to be vague rather than 

 dogmatic in treating of them. 



* Mem. Mus. Comp. ZooL, xxxi. (1904), p. 32. ' f Ingolf Echinoid. (1908), pp. 25-7. 



I As the final proof was passing through the press I received Prof. Lyman Clark's latest memoir on the 

 Cidaridae (Bull. Mus. C. Z. li. (1907), no. 7) ; he has instituted a new genus, Austrocidaris. 



§ Bull. Mus. Paris, i. (1895), p. 247. 



