THE EYES OF CAMBARUS SETOSUS AND CAMBARUS 

 PELLUCIDUS.i 



CHARLES H. SPURGEON. 

 (Department of Biology, Drury College.) 



Cambarus seiosus Faxon inhabits the caves of southwestern 

 Missouri. It was described by Faxon in Carman's account of the 

 "Cave Animals of Southwestern Missouri." An account of the 

 eyes of this species was published by Parker. 



In June, 191 1, I secured an abundance of fresh material which 

 made a reexamination of the eyes desirable. I found it in the 

 caves about Springfield, Sarcoxie and Ozark, Missouri. From 

 Smallen's cave near Ozark I secured seventy-five specimens from: 

 20 to 110 mm. in length. In addition to these, twenty-seven 

 specimens of C. pelliicidus testii Hay were taken from Mayfield's 

 cave near Bloomington, Indiana. Also thirty-three C. pellucidus 

 (Tellkampf) from Shawnee cave, Indiana University farm, near- 

 Mitchell, Indiana. The specimens from Indiana were collected! 

 during the fall and winter of 191 1 and 1912. The blind crayfish 

 from Indiana are smaller than those from Missouri. The 

 smallest taken from Indiana caves were 9 mm. in length. Others 

 varied from 15 to 60 mm. The largest specimen of C. setosus 

 taken was 120 mm. in length. 



C. setosus has been found only west of the Mississippi river, 

 while C. pellucidus has been found only east of the Mississippi 

 both north and south of the Ohio river. C. pellucidus testii 

 Hay has been recorded only from Mayfield's Cave, Bloomington, 

 Indiana. C. pellucidus has probably the widest distribution of 

 any of the blind crayfish. It has been taken from Mammoth and 

 other caves of Kentucky and from Wyandotte and other caves 

 in Crawford county, from Clifty cave, Washington county, from 

 Lost river. Orange county, from Shiloh, Down's, Donnehue's 



1 Contribution from the Zoological Laboratory of Indiana University, No. 146. 

 This work has been carried on under the direction of Professor Carl H. Eigenmann, 

 to whom I am thankful for advice and criticism. 



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