78 I'RANSACTIONS OF THE [mA.Y 11, 



May llth,- 188&. 

 Stated Meeting. 



The President, Dr. J. S. Newberry, in the chair. 



Thirty-five persons present. 



Mr. B. B. Chamberlin exhibited and remarked on certain 

 minerals from New York City. Among these were Fibrous 

 arragonite in veins one-half an inch in width in the crystalline 

 limestone of Morrisania, the only other locality known to him 

 being in the Fourth Avenue tunnel, at Ninety-sixtli Street. He 

 had now collected ten varieties of mica from the metamorphic 

 rocks ; among them a variety with a golden yellow color in 

 small plates, from the Boulevard. An imperfect crystal of rip- 

 idolite two inches in diameter ivas found on Jerome Avenue. 

 Near the Morrisania arragonite locality he had found a deposit 

 of chloritic earth, and much of the limestone was impregnated 

 with chlorite. 



President Newberry called attention to a paper by James E. 

 De Kay in Annals Lye. Nat. Hist., i, p. 45, pi. v., 1823, on fossil 

 organisms then supposed to resemble Trilobites, and termed by 

 the writer Bilohites. De Kay, however, seems to have sup- 

 posed that they were Mollusks, alied to Cardium, and Say 

 thought they resembled the genus Prodiictus. 



The figures show them to be Conocardium a Devonian mol- 

 lusk. By a strange oversight M. the Marquis de Saporta, in 

 his work on " Organismes Problematiques des Anciennes Mers,'' 

 includes the fossil Palaeozoic Algfe Rusopliycus and Cruziana 

 under the name Bilohites, stating that De Kay's name has pri- 

 ority ! 



The announced paper of the evening was by Mr. James F. 

 Kemp on '• The Geology of the Bermuda Islands." In the un- 

 avoidable absence of Mr. Kemp the paper was not delivered. 



Mr. F. J. H. Merrill remarked on tlie 



GEOLOGICAL STRUCTDRE AND AGE OF THE DEPOSITS AT GAY HEAD, MASS. 



(Illustrated with specimens and sketches.) 



