364 ANNALS OF THE CARNEGIE MUSEUM.’ 
Fic. 3. Anodonta complanata Rossmessler.—Danube River, Buda-Pest, 
Hungary, W. Israél don.—Carn. Mus., No. 61, 4,999. 
Fic. 4. Alasmidonta minor (Lea).—Cumberland River, Pineville, Bell Co., 
Ky., B. Walker don.—Carn. Mus., No. 61, 4,977. 
Fic. 5. Ptychobranchus subtentus (Say).—Cumberland River, Burnside, 
Pulaski Co., Ky., B. Walker don.—Carn. Mus., No. 61, 4,971. 
Fic. 6. Cyprogenia irrorata (Lea).—Cumberland River, Albany Landing, 
Cumberland Co., Ky., B. Walker don.—Carn. Mus., No. 61, 4,973. 
Fic. 7. Dromus dromas (Lea).—Cumberland River, Eadsville, Wayne Co., 
Ky., B. Walker don.—Carn. Mus., No. 61, 4,968. : 
Fic. 8. Friersonia iridella (Pilsbry and Frierson).—Valles River, Valles, San 
Luis Potosi, Mexico, A. A. Hinkley, coll. Dec., t906-Jan., 1907.—Carn. Mus., 
No. 61, 4,495. 
Fic. 9. Obovaria retusa (Lamarck).—Ohio River, Portland, Meigs Co., O., 
coll. Sept. 22, 1910.—Carn. Mus., No. 61, .4,773. 
Fic. 10. Obovaria unicolor (Lea).—Pearl River, Jackson, Hinds Co., Miss., 
A. A. Hinkley coll. Nov. 5, 1910.—Carn. Mus., No. 61, 4,929. 
Fic. 11. Obovaria (Pseudoén) ellipsis (Lea).—Ohio River, Portsmouth, Scioto 
Co., O., coll. Sept. 24, 1910.—Carn. Mus., no. 61, 4,777. 
Fic. 12. Nephronajas perdix (Lea).—South Fork Cumberland River, Burnside, 
Pulaski Co., Ky., B. Walker don.—Carn. Mus., No. 61, 4,985. 
The scale at the bottom of the plate represents one millimeter divided into 
tenths. 
EXPLANATION OF PLATE XX. 
Glochidia of Najades. 
Photographed with Bausch & Lomb Objective, 24 inch. 
Fic. 1. Obliquaria reflexa Rafinesque.—Bayou Pierre, De Soto Par., La., L. 
S. Frierson coll. Aug. 6, 1910.—Carn. Mus., No. 61, 4,755. 
Fic. 2. Proptera levissima (Lea).—Kansas River, Lawrence, Douglas Co., 
Kan., R. L. Moodie don.—Carn. Mus., No. 61, 4,481. 
Fic. 3. Medionidus conradicus (Lea).—South Fork Cumberland River, Burn- 
side, Pulaski Co., Ky., B. Walker don.—Carn. Mus., No. 61, 4,989. 
Fic. 4. Eurynia (Micromya) trabalis (Conrad).—Cumberland River, Rowena, 
Wayne Co., Ky., B. Walker don.—Carn. Mus., No. 61, 4,990. ; 
' Fic. 5. Eurynia (Micromya) lienosa (Conrad).—Pearl River, Jackson, Hinds 
Co., Miss., A. A. Hinkley coll. Nov. 5, 1910.—Carn. Mus., No. 61, 4,930. 
Fic. 6. Eurynia (Micromya) vanuxemensis (Lea).—Shoals Creek, Lauderdale 
Co., Ala., H. H. Smith coll. Nov. 3, 1909.—Carn. Mus., No. 61, 4,492. 
Fic. 7. Eurynia (Micromya) picta (Lea).—South Fork Cumberland River, 
Burnside, Pulaski Co., Ky., B. Walker don.—Carn. Mus., No. 61, 4,995. 
Fic. 8. Eurynia nasuta (Say).—Lake Erie, Presque Isle Bay, Erie Co., Pa., 
coll. June 3, 1908.—Carn. Mus., No. 61, 3,264. 
Fic. 9. Lampsilis anodontoides (Lea).—Colorado River, Bay City, Matagorda 
Co., Tex., D. A. Atkinson coll. May 20, 1907.—Carn. Mus., No. 61, 2,157. 
