12 JOURNAL OF THE [January, 



6. Pigeon-post film, used in the Franco-Prussian war : by J. 

 D. Hyatt. 



7. Spores of Isoetes Engletnanm, Braun : by J. D. Hyatt. 



Meeting of November ist, 1889. 



The President, Mr. Charles F. Cox, in the chair. 



Thirty-four persons present. 



Mr. Charles S. Shultz introduced to the Society Miss Mary 

 A. Booth, of Longmeadow, Mass., who was present as a visitor. 



The President read a Paper, entitled " On the lingual den- 

 tition and systematic position of Pyrgula" and presented by 

 Mr. Charles E. Beecher, a Corresponding Member of the 

 Society. This paper is published in this number of the 

 Journal, p. i. 



OBJECTS exhibited. 



1. Diatoms of the genus Aulacodiscus, 29 forms and 19 

 species ; prepared by Muller : by E. A. Schultze. 



2. Diatoms of the genus Aulacodiscus, no forms and 36 

 species ; prepared by Thum : by E. A. Schultze. 



3. Fungus affecting ' shrimp in an aquarium : by F. W. 

 Leggett. 



4. Diatoms, from Bay of Bengal. 



5. Diatoms, from Sandai, Japan. 



6. Diatoms, from cementstein of Sandai, Japan. 



7. Diatoms, from material found floating two miles off the 

 coast of Santa Monica, California, June, 1889. 



8. Diatoms, Stephanodiscus careonensis and Melosira solida. 



9. Diatoms, from Rodondo Beach, California. 



These six slides — Nos. 4-9 inclusive — were prepared and 

 exhibited by Miss Mary A. Booth, and were donated by her to 

 the Cabinet of the Society. 



On motion, the thanks of the Society were tendered Miss 

 Booth for this donation. 



Mr. Leggett stated that he had kept shrimp for the space of 

 four months in an aquarium, and that the fungus exhibited by 

 him was now becoming very destructive to them. Usually a 

 shrimp would die in one night after the appearance of the 

 filaments of the fungus upon its body. 



