90 BULLETIN OF THE 



The report was adopted, and the committee discharged. 

 The President, Mr. Taylor, then offered a brief communication 



ON THE TOTAL LUNAR ECLIPSE OF JUNE 11, 1881. 



This was noteworthy for the bright illumination of the moon's 

 disk, which occurred during totality. The features of the moon's 

 surface could be seen almost as distinctly during total eclipse as 

 during full moon. This phenomenon was attributed to the refrac- 

 tion caused by the earth's atmosphere. To an observer stationed 

 upon the moon a bright circle of sunlight would be visible sur- 

 rounding the earth, and to the light from this source was attributed 

 the illumination of the moon's disk seen during total lunar eclipses. 



This communication was discussed by Mr. Harkness. 

 Mr. Dall then presented a brief communication 



ON SOME PECULIAR FEATURES OF MOLLUSKS FOUND 

 AT GREAT DEPTHS. 



While considerable difficulty was experienced in separating some 

 of the forms by their shells alone, yet, when their anatomy was ex- 

 amined, some very striking differences were presented. Among the 

 dredgings off the Atlantic coast and in the Gulf of Mexico by the 

 Blake were found mollusks claimed to be representatives of two 

 new families having a dentition simulating that of the Docoglossa. 

 One related to the Fissurellidse and the other referable to the order 

 Rhipidoglossa. 



This communication was discussed by Messrs. Gill and Alvord, 

 after which the Society adjourned. 



210th Meeting. January 28, 1882. 



President Wm. B. Taylor in the chair. 

 Thirty-nine members and visitors present. 



Mr. Ferrel presented to the Society a communication entitled 



ON THE CONDITIONS DETERMINING TEMPERATURE, 



but, from lack of time, did not complete its presentation, and asked 

 for a continuance at some future meeting:. 



