Hyatt.] 204 [November 18, 



liam Foster and by myself. Since writing the above, the sinking of 

 the shaft has opened out the galena streak to a width of six feet. 



Note. A day or two before this paper went to the printer I made a visit to 

 the mine. The east shaft had been sunk twenty-two feet. The lead streak, 

 which lies upon the north wall of the vein, had widened to about six feet in this 

 shaft, and shows a little copper pyrites and tetrahedrite, and also a considerable 

 proportion of siderite (carbonate of iron). The copper pyrites may prove to be 

 argentiferous and auriferous as in Colorado ; this however has not yet been in- 

 vestigated. The west shaft, which lies some one hundred and fifty' or two hun- 

 dred feet from the east shaft, had been sunk about twelve feet. The lead streak 

 in this shaft is about seven inches thick and well defined. The two walls of the 

 vein have not yet been found in the west shaft, and the south wall is still want- 

 ing in the east shaft. An estimated quantity of one hundred tons of ore of good 

 smelting quality is now lying in the shaft house. 



A quantity of float ore, weighing a little over four tons, was sent to Messrs. 

 Edward Balbach & Sons of Newark, N. J., who returned the products from 

 the ore and valued the sample at thirty-eight per cent, lead, $56.76 of silver, 

 and $4.85 of gold per ton of two thousand lbs. This float ore sample may, I 

 think, prove to be a little poorer in lead than the average of the mine. 



Prof. A. Hyatt gave an account of his recent investiga- 

 tions of the Hollow-fibred Horny Sponges. This communi- 

 cation, of which but a brief abstract is here given, will appear 

 in full in the Memoirs (Vol. n, pt. iv), illustrated with a 

 plate. In this paper the following groups and species of 

 Keratose sponges are characterized. 



Suborder APLYSINiE Hyatt. 



Genus Dendrospongia Hyatt. 



Aplysina (pars) Schmidt. 



This is a new form from Florida, characterized by the large size of 

 the fibres and their open irregular net work. It includes but one 

 6pecies, D. crassa. The types are in the Museum of Comparative 

 Zoology, and in the Society's Museum. 



Genus Verongia Bowerbank. 

 Luffaria Duch. et Mich. 

 The type is Verongia Jistularis Bow. 



