336 PROCEEDINGS OF THE ACADEMY OF [1880. 



AssuLiNA SEMiNULUM. — Somewliat frequent. Of varied size and 

 hue ; from nearly colorless to dark brown, and mostly lighter at 

 the neck. Mostly empty shells ; often living specimens. 



EuGLYPHA AREOLATA, Ehr. — Small compressed spineless forms, 

 occasional. A living specimen measured as follows : 



Length 0.06, breadth 0.048 ; breadth of mouth 0.015. 



EuGLYPHA STRiGOSA. — Occasional. An empty shell measured : 

 Length 0.06, breadth 0.042 ; breadth of mouth 0.012. 



Trinema enchelys. — Common. Small forms of much variety. 



1. Length 0.03 , breadth 0.024. 



2, 3. " 0.036. " O.O.S. 



4. " 0.036, " 0.036. 



5. " 0.042, " 0.03. 



In some positions, on dripping ledges and cliffs, from among 

 the greater profusion of H^'pnums, there grew cushion-like masses 

 of bright pea-green Sphagnum, sometimes rose tufted. Water 

 .squeezed from the Sphagnum, exhibited many Diatoms, a few 

 Desmids,' pollen of Abies, starch grains, spores, etc. It also 

 contained many Rhizopods, an occasional Infusorian, a few 

 Auguillules, but no Rotifers nor Water-bears, Of Rhizopods 

 the foUowino- were observed : 



'& 



Nebela collaris. — Abundant and of much variety in shape and 

 size and in the arrangement and distinctness of the cancellated 

 structure of the shell. Compressed pyriform, or flask-shaped, 

 with oval or ovoid body and with neck of variable proportionate 

 length and breadth. Cancellated structure very variable ; mostly 

 of circles, minute and nearly uniform, or greatly varying in size 

 among themselves or in proportion with the shell. Dead shells 

 most frequent ; in living ones observed, the sarcode mostly con- 

 tracted and inactive, often encysted ; least frequently in an active 



