THE NAUTILUS. 19 



RETUSA OBTUSA var. TUHRITA. 



Reported by Mr. Dwighr Blaney from Frenchman's Bay. 



MUSCULIUM ROSACEUM Prime. 



A few specimens (immature) taken by Dana W. Sweet in Sandy 

 River, Franklin County, and by the writer in Georges River, North 

 Warren, Knox County. 



MUSCULIUM RYCKHOLTI Normand. 



Fairly plentiful in the small ponds of Warren and Thomaston, 

 Knox County. 



MUSCULIUM PARVUM St (?). 



Six specimens of a Musculium were collected by the writer dur- 

 ing past season in the Georges River at North Warren, Knox Co., 

 and sent to Dr. Sterki for determination. 



MUSCULIUM SECURIS (" form or even variety," Sterki). 



Collected August 17, 1913, in Georges River, North Warren. 

 They were returned labeled as above. 



MUSCULIUM WINKLEYI St. 



Taken at Saco, York County, by Henry W. Winkley, and at 

 Avon, Franklin County, by Dana W. Sweet. 



PlSIDIUM MONAS St. 



Six specimens one nearly full grown, others juv. taken August 

 17, 1913, in Georges River, North Warren, by the writer. 



Dr. Sterki, to whom the material was submitted, remarks as fol- 

 lows : " rather like the type from Michigan. Some examples, prob- 

 ably of same, though a little larger, from Aroostook Co. (Nylander)." 



PlSIDIUM PUNCTATUM Var. SIMPLEX St. 



Two specimens, almost full grown, taken by the writer in George 

 River, North Warren, Aug., 1913. 



PlSIDIUM VARIABILK, var. CICER Pr. 



Eleven immature specimens taken at same time and place as 

 above. 



PISIDIUM MINUS (Adams). 



A few specimens taken by the writer in Black River, Warren, 

 Knox Co., season of 1909, and in Mill River, Thomaston, 1909 and 

 1910. 



