31 



The first artificial fecundation of the eggs of this fish was 

 made by Dr. P. Ovsiannikov, in the year 1869, at Simbirsk 

 on the Volga, and in the same year a small quantity was 

 brought by him to St. Petersburg. The embryos exhibited 

 have grown up in an aquarium in the laboratory of Dr. Ov- 

 siannikov. 



There are sixteen bottles which contain embryos at various 

 stages, from a day to a year old ; also 13 microscopic slides 

 illustrating various features in the embryos. In addition to 

 these are half-a-dozen preparations illustrating points in the 

 developmental history of the axolotl, as well as a mounted 

 Coregonus-embryo showing the central nervous system and 

 mounted microscopic section of the egg of Petromyzon fluvia- 

 tilis, showing the formation of the alimentary canal. 



118. Collection of 100 species of recent shells, illustra- 

 tive of Woodward's " Manual of the Mollusca." 



Exhibited by Bryce M. Wright. 1877. PriceSL 



119. Collection of about 300 species of British marine 

 shells, illustrative of Dr. J. Gwyn Jeffreys's " British 

 Conchology." 



Exhibited by the late E. Damon. 1876. 



120. Collection of 120 species of British land and 

 fresh- water shells, illustrative of Dr. J. Grwyn Jeffreys' s 

 " British Conchology." 



Exhibited by the late R. Damon. 1876. 



121. Collection of shells for teaching purposes. 



E. 51. 1862. Presented by the Belgian Government. 



122. A small collection of 23 common species of shells 

 for school purposes. 



From the Pedagogical Museum, St. Petersburg. 

 E. 707. 1877. 



123. Collectanea entomologica. An introductory 

 course of study of insects, arranged in systematic order. 

 In a book-shaped glazed case. 



E. 1. 1858. Presented by the Entomological Society. 



124. Entomological collection of about 100 different 

 species in small glazed case for teaching purposes. 



E. 42. 1862. Presented by the Belgian Government. 



125. A series of specimens of insects, with enlarged 

 drawings of the smaller species, and illustrations of the 



