47 



Dr. C. T. Jackson remarked upon the recent discovery of 

 gold in Nova Scotia, and the general lithological charactei-s 

 of that Province. The metal is found in slate rocks and the 

 quartz veins connected with them. The locality of its oc- 

 currence was not visited in his survey. 



Mr. Marcou stated that the gold of the Atlantic coast was 

 of another formation from that of California. The slate of 

 Nova Scotia was metamorphic Taconic rock. There had been 

 found in North Carolina beds of red sandstone containing 

 gold washed into it during its formation, showing its exist- 

 ence previous to the formation of the latter. In California 

 the quartz gold-bearing veins seldom occur in the slate itself. 

 We appear to have in America gold of two different periods. 

 In Australia the gold is entirely of the drift period, while 

 that of the Atlantic coast is of anterior date. 



Mr. GaiSeld exhibited a peculiar form of crystallization 

 occurring in a pot of window glass resembling a Nasturtium 

 seed. It was probably silicate ol lime. 



3farch 19th. 

 Dr. A. A. Gould in the chair. 



Pi'of Henry J. Clark presented the following communica- 

 tion : — 



LUCERNARIA THE CcENOTYPE OF ACALEPH^. By PrOF. HeNRY 



James Clark, of Harvard University, Cabibridge. 



The present communication is a mere sketch of a most thorough 

 and exhausting anatomy of Lucernaria, which I have illustrated by 

 numerous plates, and which I propose to publish in an extended 

 memoir, in connection with some considerations upon the general 

 morphology and systematic relations of Acalephje. I have been en- 

 gaged during the whole of the past year upon the organical and his- 

 tological anatomy of this animal, in order to determine what are its 

 relations to Radiata in general, and to Acalephse in particular. I 

 have had abundant materials for study, inasmuch as this species of 

 Lucernaria is a very common inhabitant of our shores, wherever the 

 eel-grass, Zostera marina, grows. Almost invariably Lucernaria is to 

 be found upon the Zostera, and very rarely upon any other plant. 



