128 TUB NAUTILUS. 



used among the people. It is located on the east branch of Fish 

 river, between Long and Cross lakes, in Township XVII, Range 4, 

 Aroostook county, Maine. Some parts of Fish river have been 

 visited every summer since 1897, and the shells collected published 

 at various times in the Nautilus. Mud Lake (Second Lake) being 

 of special interest to conchologists, as Limncea ampin was described 

 from specimens found in this lake, I examined it for the first time 

 in August and September of last year (1901). 



The name Limnaa ampla is in use from Maine to Alaska by dif- 

 ferent collectors. The question arose a t t an early date if L. ampla 

 really could be a distinct species or only a variety of some previously 

 described form. The best authors agree it is only a variety of Say's 

 L. emarginata (also described from Maine in 1821) and my observa- 

 tions go to confirm the same. 



Mud Lake is about '1\ miles long and one wide, shallow, with 

 mud, gravelly and rocky bottom, the forest growing all around it 

 down to the water's edge. There are no settlements upon the lake, 

 and in all probability it looks just the same as when Mr. Longfellow 

 first collected his shells in 1842. A paper privately published, 4 pp., 

 4 plates and 85 figs., illustrating the variation of Limncea emarginata 

 of Fish river, was prepared in Oct., 1901, and a more elaborate one 

 will appear when all the lakes on Fish river have been examined 

 and a map prepared. 



A careful survey was made in every part of Mud Lake and col- 

 lections made in all parts of it from the shore to 15 feet in depth, 

 and the following species were obtained : 



Physa ancillaria Say. A few thin, fragile shells, nearly as clear 

 as glass, were dredged in 3 to 6 feet of water at the upper end of the 

 lake on muddy bottom. 



Limncea emarginata Say. Very abundant at the inlet in all stages 

 of growth. (The original locality of Limncea ampla Mighels.) 

 Smaller colonies were found in the upper part of the lake and on the 

 left side of lake near the outlet. 



Planorbis companulatus Say. Dredged. 



Planorbis bicarinatus Say. Dredged. 



Planorbis hirsutus Gld. Dredged in the lake and the thorough- 

 fares above and below r the lake; very variable. 



Planorbis parvus Say. 



Ancylus parallelus Hald. One specimen in thoroughfare below 

 the lake. 



Valvata tricarinata Say. One specimen. 



Valvata sincera Say. One specimen in the lake and a few in the 

 thoroughfare below the lake. 



Amnicola limosa Say. Common. 



Unio complanatus Sol. Common. 



Margaritana undulata Say. Few dead shells at the inlet, and the 

 thoroughfare between Long and Mud Lakes. 



