1910.] 



NATURAL SCIENCES OF PHILADELPHIA. 



107 



the figure. The lung is 18 mm. long, kidney 7.5 mm., pericardium 

 3.5 mm. The mantle within the last whorl is cream-colored with 

 sparse black maculation. Earlier whorls have copious black pigmen- 

 tation along the top of the whorls. 



Fig. 21.— Principal collecting stations in Cave Creek and the Parks at its head. 

 Stations marked A were explored in 1907-8 by Ferriss, the others in 1900 

 bv Ferriss and Pilsbry. 



