82 tiih; constitution of the gastropod protoconch. 



37. The Dynamics of Living Matter. New York 



(The Cohimbia University Press), 1906. 



38. Mayer, P. — "Die Metamorphosen von P. varians Leach." Car- 



cinologische Mitth. Mitth.Zool.Stat.Neapel, Bd.ii., 1881. 



39. Osborne, W.A. — Journal of Physiology, xxxiii. 



40. > — loc. cit. xxxiv. 



41. Osten-Sacken, C.R. von. — "On Mr. Portchinski's publications 



on the Larvfe of Mnscidae." Berliner Entomol. Zeits Bd. 

 xxxi., 1887. 



42. }*ERRiER, E. & Gravier, E. — "La Tachygenese," etc. Ann.des 



Sci.Nat.Zoologie, serie. Tome xvi., 1902. 



43. Ringer, S. — Various papers on the perfusion of the Frog's 



Heart with Saline Solutions. Journal of Physiology, Vols, 

 i.-viii. 



44. Tate, R., & May, W.L. — "Descriptions of New Genera and 



Species of Australian Mollusca (chiefly Tasmanian)." 

 Trans.Roy.Soc.S.Aust.xxiv., 1900. 



EXPLANATION OF PLATE I. 



Figs. 1-2. — Oymatium tortirostris Tate. 



Figs. 3-4. — Cymatium abboti Tate. 



B"'igs. 5-8 — Cymatium parkinso iiinnum Perry. 



Figures 1 to 7 are photographs which have been carefully re- 

 touched under a lens; figure 8 is reproduced from my paper, "The 

 Protoconchs of certain Port Jackson Gastropods," published in 

 1902. 



The specimens of the fossils were kindly lent me from the Aus- 

 tralian Museum Collection, by Mr. R. Etheridge, Jiir., Curator, 

 and to him my thanks are tendered. 



