284 PROCEEDINGS OF THE ACADEMY OF 



April 3, 1873. 



Meeting of the Conchological Section. 



Dr. W. S. W. RuscnENBERGER, Director, in the chair. 



Dr. F. A. Hassler presented the following memorandum of 

 experiments by Wm. M. Gabb and himself to ascertain the tena- 

 city of life in Liltorina muricata. The specimens, 140 in number, 

 were collected bj' Mr. Gabb in St. Domingo, September, 1870, and 

 hung in a basket in his office. 



A few (5 or 6) were moistened after three months, then each 

 month until May, 1871, when all were alive. Ma}^, June, July, 

 and August, 1871, 25 were moistened each month, and all found 

 to be living except 2 in July and 2 in August. These were each 

 month laid aside and not moistened again until September. At 

 this time 40 of the original lot remained, all were moistened, and 

 29 found to be alive. In September, of the 100 which had been 

 moistened during May, June, Julj', and August, 89 were alive. 

 The 118 living ones were all placed together. 



Feb. 18, 1872, the lot was again moistened and about 60 revived 

 at once, and after several hours all but 24 were or had been 

 crawling. These 24 were rejected. 



March 30, 1872. Of the remaining 94, 10 were moistened, 9 

 were alive ; these 9 were placed aside with a few which had given 

 evidence of life since the last experiment, Feb. 18. 



Sept. 18. All moistened and found living; they were also all 

 alive in December. 



Feb. 12, 1878. Two found to be dead, and were separated from 

 the others. 



March 26. All moistened, and though exposed for three da^'s, 

 only one began to crawl ; this one was separated, also 27 others 

 which were known to be dead, leaving 65 undetermined. 



