1 62 College of Forestry 



Genus Lampsilis Rafinesque 



10. Lampsilis luteola (Lamarck). 



Common in water from 3 to 18 feet deep and on all varieties 

 of bottom, except gravel. 



11. Lampsilis radiata (Gmclin). 



Found only in water from one and a half to three feet deep 

 and on boulder, gravel, and sand bottom. 



12. Lampsilis radiata oneidensis Baker. 



Common in water from 8 to 18 feet deep and on gravel and 

 mud bottom, usually the latter. 



This mussel was previously listed (Baker, '16, p. 257) as 

 horealis (Gray) but specimens of borealis (Latchford, '82, 

 p. 53) from the type locality, Duck Island, Ottawa River, 

 received from Dr. Bryant Walker, show that it is not that 

 species, true borealis having a heavier, more inflated shell, 

 heavier and difterently shaped cardinal teeth and an epidermis 

 like that of radiata. Small females of the Oneida Lake shell 

 have a superficial resemblance to Lauipsilis luteola rosacea but 

 differ in having heavier cardinal teeth as well, as in the outline 

 of the shell, and in the color and texture of the epidermis. 



This peculiar shell differes from radiata enough to be con- 

 sidered a race and the name oneidensis has been accordingly 

 given to it (see Baker, 'i6a, pp. 74-77). This race was found 

 only in deep water (8-18 feet) in the Lower South Bay region 

 but in the lot collected in 191 5 several shells were obtained in 

 shallow water, though the majority of these were dead. One 

 lot was collected in 10-16 feet of water, in the west end of the 

 lake, with the crowfoot dredge (Baker, '16, p. 90). The 

 shallow water individuals Avere evidently washed in shore from 

 deeper water. 



The luteola group of Lampsilis living in Oneida Lake is of 

 unusual interest on account of their variation. Here the two 

 species have apparently interbred, causing a mixture of the 

 characters of both species. Thus, individuals of radiata occur 

 with a normal hinge but with a polished surface like luteola. 

 Also, luteola individuals occur with a rough surface and the 



