10 



Keeping, H., and E. B. Tawney, On the beds of Headon Hill and Colwell Bay 

 in the Isle of Wight. With 1 pi. in : Quart. Journ. Geolog. Soc. Lon- 

 don, Vol. 37. P. 2. p. 85—127. 



Terquem, . ., Observations sur quelques fo.ssiles des époques primaires. Avec 

 1 pi. in: Bull. Soc. Geolog. France, (3.) T. 8. No. 6. 1880 (reç. Nov. 

 1881). p. 414—418. 



(4 esp. nouv. de Foraminifères.) 



Oarez, L., Sur l'étage du gypse aux environs de Château-Thierry. Avec figg. 

 in: Bull. Soc. Geolog. France, (3.) ï. 8. No. 6. 1880 (reç. Nov. 1881). 

 p. 462 — 468. 



Etude des terrains crétacés et tertiaires du nord de l'Espagne. Paris, 



Savy, 1881. 8". (327 p., 8 pi.) 



Bardin, l'abbé, Etudes paléontologiques sur les terrains miocènes du départe- 

 ment de Maine-et-Loire. 1. Faso. Angers, impr. de Lachèse et Dolbeau, 

 1881. 80. (119 p.) 



Rothpletz, A., Das Diluvium um Paris und seine Stellung im Pleistocän. Mit 

 3 Taf, Basel, H. Georg in Comm., 1881. 4^. Aus: Denkschr. d. Schweiz. 

 Ges. f. ges. Naturw. 28. Bd. 2. Abth. (132 p.) M 6, 40. 



Woldrich, Joh. N., Diluviale Fauna von Zuzlawitz bei Winterberg im Böhmer- 

 walde. 2. Theil. Mit 4 Taf. Wien, 1881. 8«. Aus: Sitzungsber. k. Akad. 

 Math.-nat. Gl., 1. Abth. 84. Bd. p. 177—209. Jl 2, 50. 



II. Wissenschaftliche Mittheiliingeii. 



1. The Genesis of the Egg in Triton. 



By Mr. Tomotaro Iwakawa, Tokio, Japan. 



The following contains the more important results of my study on 

 the origin and growth of the ç.^^^ of Triton j^yr r ho g aster lioje. 



The wall of the ovary consists of three layers, an external ger- 

 minal epithelium, an inner 1 i n i n g epithelium, and a middle 

 layer of connective tissue, or stroma. 



In surface views, the size of the cells of the germinal epitheliumi 

 appears to vary from place to place, being smaller in those areas where 

 germ -ce lis are in process of formation than elsewhere. That the cells 

 of these areas appear smaller than the rest, in surface views, is ex- 

 plained wholly, or partially, by the fact that they are more crowded 

 and have greater depth. This condition is brought about by the multi- 

 plication of the cells of the germinal epithelium, in limited, or scattered 

 patches. These patches correspond, in whole or in part, with the »cell- 

 islands« of W a 1 d e y e r. 



My study corroborates the generally received theory of the origin 

 of the egg from the germinal epithelium, but has led me to results 

 which are new in regard to the mode of origin. 



