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 /. 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 Hupera. For 
this reason Crosse and Fischer proposed to substitute the name yuca- 
tanense; but five years previously I had described and figured S. sing- 
leyr. The latter name will therefore stand. 
UNIONIDZ. 
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 PuLaTes V-IX. 
Piatt V.—Figs. 1, 2, 3.—Polygyra mooreana tholus (W. G. B.). Washington 
county, Texas. No. 251, A. N.S. Phila. 
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. Types. 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. 
PuLate VI.—Fig. 1.—Bulimulus 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. liquabilis (Rve.). San Marcos, Texas. Nos. 91,396 and 
91,397. 
Figs. 9, 10, 11.—B. d. liquabilis. Jackson county, Texas. No. 76,286. 
Fig. 12.—B. d. liquabilis. Lee county, Texas. No. 58,379. 
Fig Mee Sue dealbatus (Say). Type. No. 58,381, A. N. S. Phila. 
Alabama. 
