354 KANSAS UNIVERSITY 8CIENCE BULLETIN. 



Soldier creek, a tributary of the Kansas river from the north, 

 but I think that it is quite possible that this is a mistake. 

 In my collecting this shell has always been a rare one. 



Although closely related to (}. lachrymosa, the species at 

 hand is quite a distinct one. The anterior umboidal slope is 

 less extensive than in Q. lachrymosa, and the tubercles are 

 more numerous and erect. The posterior umboidal slope is 

 covered with tubercular transverse plications. The same 

 region of Q. lachrymosa bears scattered tubercles only. 



Quadula speciosa Lea. Not figured. 



Shell entirely covered with tubercles, almost quadrate, much 

 compressed, the sides flattened, almost equilateral. Poste- 

 rior margin slightly biangular and emarginate ; anterior mar- 

 gin rounded; hinge fairly heavy, beaks subelevated, sharp, 

 with fine undulations ; epidermis greenish yellow, somewhat 

 furrowed, sometimes obscurely rayed, sometimes eradiate, 

 a little shiny ; cardinal teeth fairly large, compressed oblique, 

 erect, striate, double in either valve ; lateral teeth straight, 

 fairly long, oblique. Nacre pearly and iridescent. 



This form ranges from Kansas south to Texas. I have 

 never found it in the state, but Mr. W. H. Dall informs me 

 that it has been collected from the Smoky Hill river. It is 

 one of the lachrymose Unios. Its nearest ally in Kansas 

 waters is (}. fragosa. The description is a translation of Lea's 

 original one. 



Quadrula pustulosa LEA. Plate LXXXIII, fig. 1. 



Uni" pu8tu,U>su8 Lea, Trans. Amer. Phil. Soc, IV, 1831, p. 76, pi. vn, 



fig. 7. 

 Unio dorfeuillianus Lea, Trans. Amer. Phil. Soc, vi, 1838, p. 73, pi. 



wii, fig. 54. 

 Unio schooler*: fit iistx Lea. Trans. Amer. Phil. Soc, v, 1834, p. 37, pi. 



in, fig. 69. 



Shell of medium size, solid, often quite heavy, orbicular 

 or roundly quadrate, compressed or subinflated. Anterior 

 margin circularly rounded ; ventral margin slightly to decid- 

 edly bowed, sometimes slightly produced posteriorly, and at 

 an angle of from 90 to 120 degrees ; posterior angle straight or 

 gently bowed and meeting the dorsal margin at an extremely 

 variable angle; dorsal margin either straight or bowed, 



