246 



VI. Taken July 29, 1895. Depth of haul, 25 ft. Killed and preserved in formalin. 

 YII. Taken July 12, at night. Surface skimming, using a No. 2 Bolting Cloth net. 

 Killed and preserved in 10 per cent, formalin. 



VIII. Taken Aug. 1,1895, at 9 a.m. Depth of haul, 10 ft. Killed in Flemming's fluid. 

 Preserved in 70 per cent, alcohol. 



IX. Taken Aug. 7,1895, at 4 p.m. Depth of haul, 110 ft. Killed in Flemming's fluid. 

 Preserved in 70 per cent, alcohol. 



I,II,III,IV, V, VI, VII, VIII are from Turkey Lake or Lake Wawasee; IX is from 

 Tippecanoe Lake. 



Decapoda. 



The following crayfishes from Turkey Lake were identified by Mr. W. P. 

 Hay, of Washington, D. C: 



Cambarus blandin(/ii acittus Girard. 

 Gamharus propinguus Girard. 

 Cambanis virilis Hagen. 



On a Small Collection of Mollusks from Northern Indiana. By R. Ells- 

 worth Call, M. D., Ph. D. 



The mollusks herewith reported on were collected by the members of the In- 

 diana University Biological Station during the past summer. The region is 

 sufficiently well characterized in the report of Dr. Eigenmann, the Director of the 

 Station, and it is necessary here only to allude to its salient features. 



The locality. is on the divide separating the drainage areas of the Great Lakes 

 and the Wabash River. In certain places the two drainages are practically 

 identical and thus afTord opiJortunity for the intermingling of the two faunas. 

 The lakes and streams are all well within the limit of glaciation in former ages 

 and their beds and shores are boulder-covered or lined. The bottoms of shallower 

 portions of the lakes are gravelly or muddy, while the deeper portions are either 

 muddy or sandy. Corresponding with these physical factors are certain features 

 of molluscan distribution and modification, which it is the object of these notes to 

 adduce and emphasize. 



UNIONID.E. 



Anodonta decora I^ea. Two specimens of this form were found, both of which 

 were obtained in Syracuse Lake. The specimens were very much more fragile 

 and far thinner than is usual for this species, even when secured from lakes and 

 ponds. The epidermis is quite pale, the lines of growth crowded, and the nacre- 

 ous deposit very white. Forms from sluggishly flowing streams in southern In- 

 diana and elsewhere in the Ohio basin are very highly colored, both interiorly 



