COLLECTED BY DR WILLEY. 135 



9. Phyllacanthus giguntea. 



Chondrocidaris gigantea, A. Ag. Bull. Mus. Comp. Zool. i. (1863), p. IS. 

 Phyllacanthus gigantea, id. Rev. Ech. (1872), p. 390. 

 Loc. Lifu. 



This is a very rare species, but as it has been found at either end of the inter- 

 tropical area (Sandwich Islands and Mauritius) it may be expected to appear from time 

 to time at intermediate localities. 



10. Phyllacanthus imperialis. 



Cidarites imperialis, Lamk. An. s. Vert. iii. (IS 16), p. 54. 



Phyllacanthus imperialis, Brandt, Prodr. descr. Animal. (1835), p. C8 ; A. Ag. Rev. 

 Ech. (1872), p. 391. 

 Loc. Litu. 



This again is not a common species, but is known from a wide area. 



11. Astropyga elastica. 



Astropyga elastica, Studer, MB. Ak. Berl. 1876, p. 464. 

 Loc. New Britain, 50 — 70 fins. 



The two specimens collected serve to confirm the accuracy of Prof. Studer's ob- 

 servations, but do nothing to increase our knowledge of the extent of the area which 

 the species occupies. Dr Willey tells me that this form is commonly taken in the 

 Nautilus bask i ts. 



12. Astropyga radiata. 



Cidaris radiata, Leske, Addit. Nat. Disp. Echin. (1778), p. ~<2. 



Astropyga radiata, Gray, Ann. Phil. xxvi. (1825), p. 426. 



Loc. Loyalty Islands; so far as I know this is a more westerly locality than 

 has as yet been recorded for this species. One example is quite young, and will be 

 useful in a study of the changes which the test undergoes during growth. 



13. Mespilia globulus. 



Echinus globulus, Linn. Syst. Nat. x. (1758), p. 664. 



Mespilia globulus, Ag. and Des. Ann. Sci. Nat. vi. (1846), p. 358: Loven, Bih. 

 Svenska Vet. Akad. Hdlgr. xiii. (18S7), iv. no. 5, p. 66. 

 Loc. Loyalty Islands. 



14. Temnopleurus, juv. 

 Loc. New Britain. 



15. Salmacisl sp. (pi. xvii. figs. 1 and la). 



Dr Willey collected, at New Britain, a single specimen of a remarkable and in- 

 teresting form, which is quite new to me, and has puzzled me a good deal. 



The excellent figures which Mr Berjeau has drawn of it leave little for me to 

 add, but I may point out that, though at first sight it appears to be a Cidaroid, 



