81 
Beitrag zur Lehre von den embryonal en Blatter bei den 
Mollusken. von M. Ganin, Abst. in Hoffman u. Schwalbe’s 
Jahresberichte, 1, 1872. 
Ueber die Ontogenie von Cyclas nnd die Homologie der 
Keimblatter bei den Mollusken. von Dr. Herman von Jher* 
ing, Zeit. f. Wiss. Zook, 1876, XXYII, p. 414. 
The Early Stages in the Development of the Fresh-Water 
Pulmonates. By W. K. Brooks. Studies from the Biologi- 
cal Laboratory of the Johns Hopkins University, 1879, (in 
press). 
Bemerkungen fiber Haeckel’s Gastraea-Theorie. von Dr. 
W. Salensky, Prof, in Kasan Arch. f. Haturgeschichte. 1874. 
On the Primitive Cell-Layers of the Embryo as a Basis of 
Genealogical Classification of Animals. By E. Bay Lankes- 
ter. Ann. and Mag. Hat. Hist., May, 1873. 
Hotes on Embryology and Classification, for the use of Stu- 
dents. By E. Bay Lankester. London: ls77. 
The Affinity of the Mollusca and Molluscoida. By W. K. 
Brooks, Proc. Boston Soc. Hat. Hist., XYXII, Feb. 2, 1876, 
p. 225. 
Ueber die Entwickelung der Tellerschnecke. von Carl 
Babl. Morphologisches Jahrbuch, Y, IY, Hov. 1879, p. 562. 
