174 PROCEEDINGS OF THE ACADEMY OF [March, 



places, all in Texas: White Oak bayou, Houston (Singley); Cedar 

 creek, Hudson county (G. C. Heron, type locality) ; Lavaca river, 

 Jackson county (J. D. Mitchell) ; New Braunfels, Comal county (Sing- 

 ley, Ferriss and Pilsbry) ; Guadalupe river about four miles above New 

 Braunfels (Singley, Ferriss and Pilsbry) ; Devil's river, Val Verde county 

 (Ferriss and Pilsbry). 



It is a prettily maculate little clam, widely distributed in Texan 

 waters. The largest shell I have seen measures 6 mm. long. It may 

 prove to be specifically identical with E. maculata Morelet. of Yucatan, 

 but that name is preoccupied by Anton for another species of the same 

 group. Both were described as Cyclas and belong to Eupera. For 

 this reason Crosse and Fischer proposed to substitute the name yiica- 

 tanense; but five years previously I had described and figured S. sing- 

 ley i. The latter name will therefore stand. 



UNIONID^. 



A list of species taken by us in Arkansas, Indian Territory and 

 Texas will be published elsewhere. As our work in these States was 

 done in the early spring, we found most of the streams too high for 

 effective collecting of bivalves. 



Explanation of Plates V-IX. 



Plate V. — Figs. 1, 2, 3. — Polygyra mooreana thohis (W. G. B.). Washington 



county, Texas. No. 251, A. N. S. Pliila. 

 Figs. 4, 5, 6, 7. — Polygyra mooreana (W. G. B.). Guadalupe river, Comal 



county, Texas. No. 91,364. Figs. 8, 9, 10. — Hondo river near 



Hondo, Texas. No. 91.361. 

 Figs. 11, 12. — Polygyra texasiana texensis Pils. Tvpes. Colorado City, 



Texas. No. 83,258. 

 Figs. 13, 14, 15. — Polygyra texasiana hyperolia Pils. and Ferr. West of 



Devil's river, Texas. No. 91,363. 

 Figs. 16, 17, 20. — Polygyra texasiana (Moric). Typical. Guadalupe river 



Comal county, Texas, No. 91,362. 

 Figs. 18, 19. — Polygyra texasiana (Moric). Race with striate base, Calhoun 



county, Texas. No. 229, A. N. S. Phila. 



Plate VI. — Fig. 1. — Bulimidus dealbatus mooreanus (W. G. B.). San Antonio, 



Texas. No. 84,626. 

 Figs. 2, 3, 4. — B. d. mooreanus. Guadalupe river above New Braunfels. 



No. 84,628. 

 Figs. 5, 6. — B. d. mooreanus. Victoria, Texas. No. 76,210. 

 Figs. 7, 8. — B. d. Uquabilis (Rve.). San Marcos, Texas. Nos. 91,396 and 



91,397. 

 Figs. 9, 10, 11. — B. d. Uquabilis. Jackson county, Texas. No. 76,286. 

 Fig. 12. — B. d. Uquabilis. Lee county, Texas. No. 58,379 

 Fig IS.— Bulimulus dealbatus (Say). Type. No, 58,381, A. N. S. Phila. 



Alabama. 



