SCAMMON : THE UNIONID^ OF KANSAS, PART I. 351 



teeth ; posterior and anterior cicatrices both distinct ; dorsal 

 cicatrices situated on the under part of the cardinal tooth, 

 within the cavity ; cavity of the beaks deep and angulated ; 

 nacre very pearly and iridescent." (Lea.) 



This species, according to Simpson, ranges from Kansas 

 «outh to Texas. I have never found this species in the state, 

 nor is it present in any of the collections of Kansas Unios which 

 I have examined. It is very close to Q. lachrymosa. I 

 admit it only on Simpson's authority. Doctor Dall states 

 that it has been collected from the Neosho in Indian Territory. 

 The description is Lea's original in the Transactions of the 

 American Philosophical Society. 



Quadrula lachrymosa Lea. Plate LXXXII, fig. 2. 



Unio lachrymosus Lea. Trans. Amer. Phil. Soc, ill, 1828, p. 272, 



pi. VI, fig. 8. 

 Unio asperrivius Lea. Trans. Amer. Phil.- Soc, iv, 1831, p. 71, pi. v, 



fig. 3. 



Shell moderate to large, solid, thickest anteriorly, com- 

 pressed or moderately inflated, quadrate in outline. Anterior 

 margin and the anterior third of the ventral margin one regu- 

 lar and almost circular curve, remainder of the ventral margin 

 straight or slightly incurved ; posterior margin slightly curved, 

 straight, or emarginate ; dorsal margin straight or a little 

 curved, slightly oblique, connecting with the posterior slope at 

 anangle of from 90 to 120 degrees. Umboidal ratio, 0.25 to 0.40. 

 Umbones small, moderately elevated, incurved, ornamented 

 with small, double-looped nodulous ridges. Anterior umboidal 

 slope rather fully rounded ; lateral slope more or less grooved 

 with a broad, shallow, radial furrow, the sides of which are 

 commonly ornamented with an irregular band of tubercles, 

 which is made up of many small and a few large, tear-like pro- 

 jections. These bands rarely extend to the ventral margin, and 

 the posterior is generally the shorter of the two. Postumboidal 

 ridge generally well marked and posterior slope generally 

 slightly excavated and more or less pustulose dorsally. Epi- 

 dermis fairly smooth and sometimes shiny, in color from 

 greenish horn to dark chestnut-brown. The umbones of 

 the young shells are often covered with a large triangular 

 _patch of dark green. Lines of growth numerous, raised, and 



