OF ARTS AND SCIENCES. 73 



of the outer funnel is about five inches, but in one size the bottle has 

 the capacity of a pint and in the other of a quart. I employ the larger 

 size only when a prolonged washing of the precipitate is necessary. 

 The cost of the apparatus complete is only two dollars, the price of 

 an ordinary filtering-stand with iron rings." 



Professor Gray presented a communication entitled, " No- 

 tices of New Species of Mosses from the Pacific Islands," by 

 William S. Sullivant. 



" The Mosses here noticed are a part of the collections made by the 

 United States Exploring Expedition under the command of Captain 

 Charles Wilkes ; and are presented in this form for the purpose of 

 securing to the Expedition the priority of their discovery. Similar 

 notices of new Mosses and Hepaticse from Tierra del Fuego and 

 Oregon, belonging to the same collections, have already appeared in 

 the second volume of Hooker's Journal of Botany (1850). 



" 1. Hypnum apertum (n. sp.) : monoicum ; caule prostrato elongate 

 arete repente pinnatim ramoso ; ramis dissitis insequalibus com- 

 planatis ; foliis laxissime bifariam imbricatis suboblique orbiculari- 

 ovatis acuminulatis concaviusculis ecostatis firmiusculis subscariosis 

 pellucidis estriatis integerrimis nitidis minute elliptico-areolatis ; cap- 

 sula suburceolata horizontali pendulave annulata ; operculo hemispha^- 

 rico-conico ; pedicello flexuoso-erecto Isevi. — Hab. On the ground, 

 Tahiti, Society Islands. 



"2, Hypnubi molluscoides (n. sp.) : pusillum, dioicum ; csespite 

 deplanato intricate mollissimo lutescente ; caule fasciculatim diviso, 

 divisionibus densissime plumseformi-pinnatis ; foliis e basi lata lan- 

 ceolato-attenuatis falcatis secundis vix serrulatis costellis binis brevissi- 

 mis indistinctis minute lineari-areolatis cellulis basilaribus laxioribus 

 majoribus ; perichsetialibus stricto-convolutaceis apice longe attenuatis 

 patentibus ; capsula minuta ovali-urceolata horizontali vel pendula ; 

 dent, peristomialibus lanceolato-subulatis dense trabeculatis, ciliis cari- 

 nato-stereodontibus, ciliolis singulis binisve validis granulosis ssepe 

 rimosis ; annulo segre solubili ; operculo hemisphserico-conico recte 

 rostellato ; pedicello longiusculo gracillimo. — Hab. Tahiti, Society 

 Islands. 



" 3. Hypnum Wilkesianum (n. sp.) : dioicum, majusculum, sordide 

 rufescens ; csespitibus extensis laxis ; caulibus prostratis rigidiusculis 



VOL. III. 10 



