258 proceedings: biological society 



resistance of malaria organisms to low temperatures in the body of the 

 mosquito host. 



Mr. Van Dine's paper was illustrated with lantern slide views of 

 the various conditions on the plantation. Messrs. William Palmer, 

 Doolittle, and Knab took part in the discussion. 



The 553d regular meeting of the Biological Society of Washington 

 was held in the Assembly Hall of the Cosmos Club, Saturday, March 

 25, 1916, at 8 p.m.; called to order by President W. P. Hay, with 40 

 persons present. 



The President called attention to the recent death of Henry Talbott, 

 a member of the Society. 



Under the heading Brief Notes and Exhibition of Specimens, General 

 Wheeler showed lantern slide views of the country along the Mexican 

 border of the United States. Mr. A. A. Doolittle exhibited a speci- 

 men of Amblystoma puncta um from the District of Columbia. Dr. 

 O. P. Hay exhibited the mutilated braincase of an elk which had caused 

 much difficulty in identification; he showed also a remarkably well 

 preserved skull of an extinct horse. President Hay exhibited a number 

 of lantern slides of biological interest, chiefly of aquatic animals in the 

 vicinity of Beaufort, North Carolina. Medical Inspector Ames asked 

 if any member present had positive knowledge as to the ability of 

 camels to swim; this question was discussed by several members. He 

 also inquired as to the possible existence of a South American animal 

 with dorsally placed mammae. 



The regular program was as follows: 



W. P. Hay: Notes on the growth of the loggerhead turtle (Illustrated by 

 lantern slides and chart). Mr. Hay gave an account of two young 

 loggerhead turtles now under observation at the U. S. Fisheries Bio- 

 logical Station at Beaufort, North Carolina. They are the survivors 

 of a lot of 77 hatched September 9 to 11, 1912, from eggs obtained from a 

 nest on Bogue Bank about six weeks earlier. When first hatched the 

 average size and weight of the young were: Total length 77.3 mm.; 

 length of carapace, 46.2 mm.; weight, 20.1 gram. At the age of three 

 years the survivors measure 493 and 515 mm. in total length and 343.75 

 and 365 mm. in length of carapace, and weigh 6690 and 7967 grams, 

 respectively. The increase in size and weight has been steady and the 

 measurements, which have been taken twice a year, can be plotted as 

 points on a curve. This curve continued indicates that the maximum 

 size of this species, about 1000 mm. in length of carapace, may possibly 

 be obtained in the tenth or eleventh year and that sexual maturity is 

 probably reached in the sixth or seventh year. This is considerably 

 more rapid growth than has usually been attributed to animals of this 

 kind. 



The paper was discussed by Dr. R. W. Shufeldt, Dr. O. P. Hay, 

 Medical Inspector Ames, and Mr. Doolittle. 



R. W. Shufeldt: The restoration of the dinosaur, Podokesaurus 

 holyokensis. Dr. Shufeldt gave an historical account of a discussion 



