Miscellanies. 183 



Melania, five of Pupa, six of Paludina, seven of Planorbis, four of Lu- 

 cunea, two of Cyclostoma, two of Bulimus, three of Physa, two of 

 Ancylus, besides some doubtful species. He had also found speci- 

 mens of the Lymneus humilis, Say, and the Anodonta Ferussaciana. 



Dr. J. Wyman exhibited a portion of the lung of a sheep, in the 

 bronchi of which were vast numbers of parasites, a species of Filaria ; 

 they invariably occupied those portions of the bronchi most distant 

 from the trachea, and were collected together in clusters of from 

 ten to twenty in number. He also exhibited a dissection of the egg 

 of a snake which had partially undergone the process of incubation. 

 The shell was membranous, with granules of calcareous matter scat- 

 tered over its surface. When the egg was first opened, the animal 

 was living ; the circulation could be distinctly seen ; the head was 

 large in proportion to the rest of the body, and its longest diameter 

 at right angles to the trunk instead of being in the same line as in the 

 adult. 



Dr. A. A. Gould had ascertained that the Scutella referred to him 

 at the last meeting was the S. bifissa of Lamarck. The Scutellae have 

 a shell extremely depressed, flat on the under surface, in the center 

 of which is the mouth, and between the latter and the edge of the 

 shell is the anus. The S. bifissa is so called from its two deep emar- 

 ginations ; the portion enclosed between the emarginations varies in 

 its figure, sometimes projecting beyond the surrounding parts, and 

 occasionally overlapping them. There is but one species of Scutella 

 common on our coast, which Dr. Gould thinks is undescribed. 



Feb. 12, 1840.- Geo. B. Emerson, Esq., President, in the chair. 



Rev. J. L. Russell, of Chelmsford, read a paper entitled "Re- 

 marks on the Cryptogamia of Chelmsford," accompanying which 

 were specimens for the Society's herbarium. The species referred 

 to were as follows : 



Squamaria rubina, Hoff"., not mentioned in Hitchcock's catalogue 

 of the plants of Massachusetts. This lichen is considered rare in 

 other parts of New England. In Chelmsford it is one of the most 

 beautiful lichens investing the surfaces of bowlders. Its synonymy, as 

 ascertained by Mr. Edward Tuckerman, Jr., embraces Lichen chry- 

 soleucus of Hud. ; Parmelia chrysoleuca, Ach. ; and Lecanora chry- 

 soleuca, Ach. It is found uniformly on granite bowlders in intimate 

 association with supposed to be Lecidea lapicida, Ach., which also 

 is not found in Hitchcock's catalogue. It is best distinguished by the 

 apothecia chiefly occurring between the areolae, and by their being 

 black with a margin of the same color. 



