OF NEW SOUTH WALES. 145 



Hab. 360 miles North-East of Sydney, New South Wales. 

 Taken in the towing net on a calm day. The surface of the 

 ocean appeared to be covered with them. 



The appendix by Mr. Ralph Tate to Woodward's Manual of 

 the Mollusca, 1875, 3rd edition, says that Sinusigera, D'Arbigny, 

 Gheletropis, Forbes, is the fry of species belonging to the Muri- 

 cidce. He also states that the Macgillivrayia only comprises the 

 larva forms of several species of Dolium ; the fact is, that it is 

 like a good many more things in Zoology not thoroughly worked 

 out at the present time. There is one thing certain that the 

 Macgillivrayia is operculated. I don't see that it can be placed 

 with Dolium y a genus without operculum. 



The Echini of Australia 

 (including those of the Che vert Expedition.) 



By the Rev. J. E. Tenison- Woods, F.G.S., &c, Corr. Mem. Linn. 



Soc, N.S.W. 



Ever since the publication of Prof. A. Agassiz's great work, 

 " Revision of the Echini,*" the determination of species has been 

 a comparatively easy task. These singularly interesting organ- 

 isms, whose forms vary as far as it is possible, while retaining a 

 uniform type, have been but little understood until very lately. 

 Even now much remains obscure about them, and their classifi- 

 cation consequently is hardly a natural one. In past times this 

 has led to misconception of characteristic features, and conse- 

 quently a host of genera. Their different aspects at various 

 stages of growth has also been little known, and this has led to 

 an almost endless multiplication of species, and consequently a 

 most disheartening amount of synonyms. Prof. Agassiz has 

 remedied much of this. Carefully studying each species within 

 his reach, especially in its various stages of growth, he has made 

 himself thoroughly acquainted with the limits within which 



•Printed for the American Government in 1873. 



