104 THE NAUTILUS. 



Fossils in the Marl Deposit in Lovely Brook Bog, 

 Fort Fairfield, Aroostook County, Maine. 



Physa heterostropha Say. Large, specimens rare. 



Limnasa desidiosa Say. 



Planorbis parvus Say. 



Planorbis hirsutus Gld. Rare. 



Planorbis crista Linne, var. cristata Drap. One good specimen. 



Pisidium variabile Prime. 



Pisidium abditum Hald. 



Pisidium splendidulum Sterki. 



Pisdium ventricosum Prime. 



Pisidium contortum Prime. 



i 

 Living Shells in the Lovely Brook Bog. 



Physa heterostropba Say. Rare. 



Limntea desidiosa Say. Rare. 



Pisidium variabile Prime. Common. 



Pisidium ventricosum Prime. Small but abundant, especially on 

 the marl deposit. 



Pisidium splendidulum Sterki. Common and very variable. 



Pisidium medianum var. mimitum Sterki. The type locality; 

 small but very fine specimens. 



Pisidium contortum Prime, so abundant among the fossils, is one 

 of the rarest living Pisidia. Only a few specimens have been col- 

 lected in Mud Lake, in the northeast corner of Perham, Aroostook 

 County, Maine. It is dangerous to go near the water's edge, as the 

 boggy shores break through and one sinks in the mud. 



PUBLICATIONS RECEIVED. 



CONTRIBUTIONS TO THE TERTIARY FAUNA OF FLORIDA, with 

 especial reference to the Silex beds of Tampa and the Pliocene bed 

 of the Caloosahatchie River ; including in many cases a complete 

 revision of the generic groups treated of and their American tertiary 

 species. By WILLIAM HEALEY DALL, A. M. Transactions of the 

 Free Institute of Science, Philadelphia, Vol. Ill, Part V, Dec., 

 1 900. 



This part contains about 270 pages, and 12 plates, treating of the 

 families Solenidce, Donacidce, Psammobiidtz, Semelidce, Tellinida, 



