364 Annals of the Carnegie Museum. 



Fig. 3. Anodonla complanaia Rossmaessler. — Danube River, Buda-Pest, 

 Hungary, W. Israel don. — Cam. Mus., No. 61, 4,999. 



Fig. 4. Alasmidonta minor (Lea). — Cumberland River, Pineville, Bell Co., 

 Ky., B. Walker don. — Cam. Mus., No. 61, 4,977. 



Fig. 5. Ptychobranchus subtenlus (Say). — Cumberland River, Burnside, 

 Pulaski Co., Ky., B. Walker don. — Cam. Mus., No. 61, 4,971. 



Fig. 6. Cy progenia irrorata (Lea). — Cumberland River, Albany Landing, 

 Cumberland Co., Ky., B. Walker don. — Cam. Mus., No. 61, 4,973. 



Fig. 7. Dromns dromas (Lea). — Cumberland River, Eadsville, Wayne Co., 

 Ky., B. Walker don. — Cam. Mus., No. 61, 4,968. 



Fig. 8. Frier sonia iridella (Pilsbry and Frierson). — Valles River, Valles, San 

 Luis Potosi, Mexico, A. A. Hinkley, coll. Dec, 1906-Jan., 1907. — Cam. Mus., 

 No. 61, 4,495. 



Fig. 9. Obovaria retusa (Lamarck). — Ohio River, Portland, Meigs Co., O., 

 coll. Sept. 22, 1910. — Cam. Mus., No. 61, 4,773. 



Fig. 10. Obovaria unicolor (Lea). — Pearl River, Jackson, Hinds Co., Miss., 

 A. A. Hinkley coll. Nov. 5, 1910. — Cam. Mus., No. 61, 4,929. 



Fig. 11. Obovaria {Pseudoon) ellipsis (Lea). — Ohio River, Portsmouth, Scioto 

 Co., O., coll. Sept. 24, 1910. — Cam. Mus., no. 61, 4,777. 



Fig. 12. Nephronajas perdix (Lea). — South Fork Cumberland River, Burnside, 

 Pulaski Co., Ky., B. Walker don. — Cam. 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 N a jades. 



Photographed with Bausch & Lomb Objective, % inch. 



Fig. 1. Obliquaria reflexa Rafinesque. — Bayou Pierre, De Soto Par., La., L. 

 S. Frierson coll. Aug. 6, 1910. — Cam. Mus., No. 61, 4,755. 



Fig. 2. Proplera lavissima (Lea). — Kansas River, Lawrence, Douglas Co., 

 Kan., R. L. Moodie don. — Cam. Mus., No. 61, 4,481. 



Fig. 3. Medionidus conradicus (Lea). — South Fork Cumberland River, Burn- 

 side, Pulaski Co., Ky., B. Walker don. — Cam. Mus., No. 61, 4,989. 



Fig. 4. Eurynia {Micromya) trabalis (Conrad). — Cumberland River, Rowena, 

 Wayne Co., Ky., B. Walker don. — Cam. Mus., No. 61, 4,990. 



Fig. 5. Eurynia {Micromya) lienosa (Conrad). — Pearl River, Jackson, Hinds 

 Co., Miss., A. A. Hinkley coll. Nov. 5, 1910. — Cam. Mus., No. 61, 4,930. 



Fig. 6. Eurynia {Micromya) vanuxemensis (Lea). — Shoals Creek, Lauderdale 

 Co., Ala., H. H. Smith coll. Nov. 3, 1909. — Cam. Mus., No. 6i, 4,492. 



Fig. 7. Eurynia {Micromya) picta (Lea). — South Fork Cumberland River, 

 Burnside, Pulaski Co., Ky., B. Walker don. — Cam. Mus., No. 61, 4,995. 



Fig. 8. Eurynia nasuta (Say). — Lake Erie, Presque Isle Bay, Erie Co., Pa., 

 coll. June 3, 1908. — Cam. Mus., No. 61, 3,264. 



Fig. 9. Lampsilis anodontoides (Lea). — Colorado River, Bay City, Matagorda 

 Co., Tex., D. A. Atkinson coll. May 20, 1907. — Cam. Mus., No. 61, 2,157. 



