1885.] NEW YORK ACADEMY OF SCIENCES. 15 



Mass., where mastodon remains were found a year ago. The 

 article stated that this was the first discovery of mastodon re- 

 mains east of the Hudson River. Dr. Brixton referred to the 

 discovery of a hirge portion of a mastodon's tusk in a cellar 

 excavation in Morrisania, New York City, three years ago. He, 

 at that time, exhibited fragments to the Academy, and the 

 matter was noted in the Transactions and in the School of 

 Mines Quarterly. 



Prof. D. S. Martin stated that some fifteen or twenty years 

 ago a mastodon skeleton was exhumed in excavating for the 

 Ridgewood, L. I., reservoirs. 



The Chairman said that, in liis knowledge, only three other 

 localities east of the Hudson had supplied these fossils. They 

 Avere Bristol, Conn. ; Mt. Holly, Vt. ; and a place in Nova Scotia. 

 Agassiz had teeth from the Mt. Holly specimen. It was a ques- 

 tion to Avhat degree the Hudson might have been a barrier to 

 the migration eastward of these animals. 



The-paper announced for the evening was read by Dr. A. A. 



JULIEN. 



ON A phosphorescent FLAGELLATE INFUSORIAN, PROBABLY 

 A NEW species OF NOCTILUCA, FROM THE SURF AT OCEAN 



beach, N. J. 



(Illustrated with an exliibition of the i)hosphorescence, and of 

 preparations under the microscope.) 



In this paper Dr. Julien described the remarkable brilliancy 

 of the sea as observed along the New Jersey coast for several 

 evenings in the early part of this month. He found a direct 

 relation between the temperature of the water and the degree of 

 luminosity of the same, and referred the phenomenon to the shore- 

 ward movement of surface bands of warm water from the Gulf 

 Stream. Various forms of acalephs and ascidians (Salpa) were 

 found in the water, but although many of these were luminous, 

 none of them could account for the general and striking milky- 

 white glow of the sea, which presented a most remarkable aspect, 

 and on the night when it was most marked, allowed a person to 

 read print while standing on the beach. 



Upon making a microscopic examination of the water, he 



