RECORDS. 659 



be given up at the temperature of excitation, even when as low 

 as — 1 90° C, but if it is cooled below the temperature of excitation, 

 the phosphorescent discharge is arrested, and remains so until 

 the temperature is raised again until it is within at least 100° of 

 the temperature of excitation. 



It was found that calcium tungstate which gives a whitish 

 fluorescence when exposed to Roentgen rays, gave a green 

 phosphorescence when exposed to light while immersed in liquid 

 air. 



Wm. S. Day. 



Secretary. 



SECTION OF BIOLOGY. 



May 8, 1899. 



Section met at 8:10 P.M., Professor F. S. Lee, presiding. 

 The minutes of the last meeting of Section were read and ap- 

 proved. 



The following program was then offered : 



W. R. Rankin, Notes on the Crustacea of Bermuda, Col- 

 lected BY THE New York University Expeditions of 1897 

 AND 1898. 



H. F. Osborn, Upon the Structure of the Feet of the 

 Mule-Footed Hog of Texas. 



H. F. Osborn, Upon a Complete Skeleton of Tylosaurus 

 Dyspelor, Including the Cartilaginous Sternum. 



Summary of Papers. 



Professor Rankin's paper gives a list of 61 recorded species 

 of Crustacea from the Bermuda Islands. The paper appears in 

 full on pages 521—548 of the present volume of the Annals. 

 Of the total number of species, 43 were found by the expedi- 

 tion, and notes on their distribution are given. Eight of these 

 43 species are new to the Bermudas, and two, Nika beriuudensis 

 diad Alpheits lancirostris are new species. The genus iVz/'^ is for 

 the first time recorded from the West Atlantic region. 



