SCAMMON : THE UNI0NID.E OF KANSAS, PART I. 291 



Kansas river system it is uncommon. Cragin has reported 

 it from Mill creek, AVabaunsee county, and it is occasionally 

 found in the Wakarusa river. In the Marais des Cygnes and 

 the eastern and southern rivers it is quite common, in fact, 

 one of the most abundant shells in the latter. It has not been 

 reported from the Arkansas river. The variety is confined 

 to the eastern rivers of the southern drainage, where it is 

 often more abundant than the true species. 



Lampsilis higginsii Lea. Not figured. 



Unio higginsii Lea, Proc. Acad. Nat. Sci. Phila., IX, 1857, p. 84. 



"Shell thin, oblique, ventricose, very much unequilateral, 

 rounded anteriorly, hinge fairly heavy ; beaks very prominent, 

 full, incurved ; epidermis olive-green, polished, very much 

 rayed ; cardinal teeth large, heavy, erect, crenulate, double in 

 either valve ; laterals fairly long, moderately heavy, almost 

 straight; nacre either white or tingedwith salmon color." 

 (Lea.) 



L. higginsii ranges from Ohio west to Iowa, and thence to 

 Kansas, according to Simpson. A specimen of this species 

 from the Blue river is in the National Museum (Dall). The 

 description given above is a translation of the Latin one pub- 

 lished by Lea in the proceedings of the Philadelphia Academy 

 of Science for 1857. 



Lampsilis anodontoides Lea. Plate LXIV, fig. 1. 



Unio anodontoides Lea. Trans. Amer. Phil. Soc, iv, 1834, p. 81, pi. 

 vm, fig. 11. 



Shell of moderate size, fairly solid, oblong anterior margin 

 shortly rounded ; ventral margin slightly curved, somewhat 

 produced in females ; posterior margin roundly pointed in 

 males, blunt in females ; dorsal margin straight or slightly 

 curved and joining the posterior at an angle of from 150 to 

 160 degrees. Umboidal ratio, 0.20. Umbones prominent, 

 and marked with from eight to ten slightly double-looped 

 ridges. Anterior umboidal slope quite abruptly rounded ; 

 lateral slope rounded and marked by a broad and exceedingly 

 shallow furrow, ventrally in females. Posterior umboidal 

 ridge well marked ; posterior slope very abrupt in old speci- 

 mens, and often slightly excavated. Epidermis, from pale 



