Vihriehacill'iHiiin\ I". .«r;y//'a//.-< abounded iu certuin pliice? whcre 

 here seemed unmistakable evidence of sewage oontamina- 

 lion. These were seen in conjunction with whirring and 

 infinitesimal objects, which in immense numbers were 

 lashing themselves ihrough the clustering mass.s of their 

 neiglibors, and which were believed to l)e B<i€UriumtevrruK 



The species of mollusca have been almost entirely con- 

 fined to Harlem Lake. Phym heterosiropha and Pl<morhu< 

 imrrii» excepted. They were not numerous, but were 

 encountered alon£: the 'shores at various points, and all 

 belong to shore feeding species The anodontas were found 

 mostly represented by dead shells, but one living specimen 

 of A.'fluviatilis was taken. Tlieir habitat seemed to be 

 near and under the wooded banks of the pond. We are 

 indebted to Mr. C'oncklin for the lists of fishes, and we 

 owe to Mr. Sanderson Smith acknowledgment for identi- 

 fications among the mollusca. 



FLORA AND FAUNA OF THE TWO LARGER FRESH WATER 

 LAKES OF CENTRAL PAliK. N. Y. 



Protisional IM made in 1884. 



ALG^. 



Confervoidea. 



Oscillatoria chloriua. Sph^rium sulcatum, 



nigra. Bolryococcus Braunii. 



" Frohlichii. Protococciis spy 



Conferva sp. (?) stigeoclon- Poh^edrium spinosum. 



ium (y). ! Spinilina Jenneri. 



Nostoc sphcericum. \ Palmoglaea macrococca. 



Anab.Tna flos-aquie. | Palmella hyalina. 



gigantea. i Scytonema sp? 



Spirogyra diluta. I Chantransia expansa. 



Batrachospermum monili- | Scenedesmus quadricauda. 

 forme. " polymcrphus. 



Coelosphserium dubiuin. Volvox globator. 



Deitmidi<. 



Closterinm Ehrenbergii. Ilyalotheca dissiliens. 



griffithsii^ Ptdiastrum boryanum. 



venus. '■ Staurastrum gracile. 



Cosmarium mariraritiferum. I 



