1851.] 331 



Mr. Lea exhibited a specimen of Zircon imbedded in blue Quartz, 

 from the vicinity of the Yellow Springs, Chester county, Pennsylvania. 



Mr. Yaux requested the attention of the members to the beautiful 

 suit of specimens of Minerals from Nova Scotia, presented this evening 

 by Isaac Chipman, Esq., many of which were not in the collection of the 

 Society. 



December 23f?. 

 Vice-President Bridges in the Chair. 



Dr. Leidy read a paper, intended for publication in the Proceedings, 

 entitled "Contributions to Ilelminthology." Referred to Drs. Hal- 

 lowell, ^Vilson, and Zantzinger. 



Dr. LeConte read a paper, intended for publication in the Pi-oceedings, 

 entitled "Synopsis of the Lampyrides of temperate North America." 

 Referred to Dr. Leidy, Dr. McEuen, and Mr. Lea. 



Dr. Leidy made some remarks upon the two species of Rhinoceros 

 from Nebraska, which he had named R. Nebrascensis and R. occidentalis, 

 and said he had satisfied himself they both belonged to the sub-genus 

 Acerotherium, Kemp., a good character of distinction of which, in the 

 teeth, is the presence of a well developed basal ridge. 



Mr. Lea exhibited a complete suite of specimens of Unio multiplicatus, 

 from the Western Rivers of the United States, and made some extended 

 remarks on the Family Naidee. 



December SO th. 



Vice-President Wetherill in the Chair. 



The Committee to which was referred the following paper by Dr. Le 

 Conte, reported in favor of publication in the Proceedings. 



Synopsis of the Lampyrides of Temperate North America. 

 By John L. Le Conte, M. D. 



LAMPYRIDES. 



Mandibulfc Integra} : labrum obtectum : abf^omen 6-vel 7-articulatum articulis 

 omnibus liberis : tarsi 5-articulati articnlo quarto calceato, plus minusve 

 bilobato; femora ad troehanteris basin et latus inserta. 



Div. l"'a. Photophori. 



Abdomen srcpissime 7-articulatnm,* articulis ultimis ssepius phosphoreis ; 

 antenna) approximatce ; tarsi articulo 4to subtus calceato. 



* Colophotia has only six segments in the abdomen. 



48 



