230 Wisconsin Academy of Sciences, Arts and Letters. 
SYSTEMATIC CATALOG OF SPECIES. 
(See Table.) 
Class PELECYPODA. 
ORDER PRIOXODESMACEA. 
Superfamily Xaiadacea. 
Family Unioiidae. 
Genus Lampsilis Rafinesque. 
1. Lampsilis ventricosa (Barnes). 
Station XX 1 , XXII. Apparently not common as only 
three specimens were found. 
2. Lamp&iis luteola (Lamarck). 
Stations III, IV 1 , X, XX 2 ,XXII. The' luteolas in¬ 
habiting Tomahawk Lake and vicinity are apparently close¬ 
ly related to Marsh’s superiorensis, which is undoubtedly 
a variety or race of luteola 1 . Some specimens answer well 
to the original description and figures. The shape of the 
shell, however, is rather of the luteola type than of the 
superiorensis type. The specimens are all small (60 to 70 
mill.) and vary from unicolored to distinctly rayed. The 
surface varies from smooth and shining to rough and 
scabrous. The hinge teeth are thin, especially the cardinal 
teeth, which are rather weak. All of the stations in which 
this species was found were of the rough water type. 
3. Lampsilis ligamentina (Lamarck). 
Station XX 1 , XXII. Specimens of this species from 
the Wisconsin River are quite normal, though small, and 
distinctly rayed. The Gilmore Creek examples are more 
quadrangular in outline and less distinctly rayed. Both 
inhabit swiftly running water. 
4. Lampsilis recta (Lamarck). 
Station XX 1 . 
i Nautilus, x, p. 103, pi. 1, figs. 1, 2, 5, 1897. 
