EXPLANATION OF PLATE LXXXIX. 
Glochidia of Unionidae. 
All photographs taken with Bausch & Lomb two-thirds inch objective. In figs. 1, 
2, and 4, some of the outlines of the glochidia have been intensified. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
1. Quadrula subrotunda kirtlandiana (Lea). Mahoning River, Mahoningtown, Law- 
rence County, Aug. 2, 1907. Cat. No. 61.2977. Specimen 9. 
2. Quadrula rubiginosa (Lea). Crooked Creek, Rosston, Armstrong County, Aug. 3, 
1909. Cat. No. 61.4366. Specimen 217. 
3. Quadrula undulata (Barnes). Pymatuning Creek, Pymatuning Township, Mercer 
County, July 8, 1909. Cat. No. 61.4840. Specimen 15. i 
4. Pleurobema obliquum coccineum (Conrad). Slipperyrock Creek, Wurtemberg, 
Lawrence County, July 4, 1909. Cat. No. 61.4385. Specimen 19. 
5. Pleurobema clava (Lamarck). Neshannock Creek, Eastbrook, Lawrence County, 
June 18, 1908. Cat. No. 61.3335. Specimen 40. 
6. Llliptio crassidens (Lamarck). Allegheny River, Kelly, Armstrong County, 
June 22, 1909. Cat. No. 61.4297. Specimen 52. 
. 7. Elliptio gibbosus (Barnes). Neshannock Creek, Eastbrook, Lawrence County, 
June 18, 1908. Cat. No. 61.8331. Specimen 57. 
. 8. Alasmidonta heterodon (Lea). Schuylkill Canal, Manayunk, Philadelphia County, 
April 24, 1909. Cat. No. 61.4250. Specimen 70. 
. 9. Alasmidonta undulata (Say). Crooked Creek, Tioga, Tioga County, Aug. 19, 
1909. Cat. No. 61.4242. Specimen 76. 
. 10. Symphynota compressa Lea. Conneaut Outlet, Conneaut Lake, Crawford 
County, May 14, 1908. Cat. No. 61.8297. Specimen 90. 
. 11. Symphynota complanata (Barnes). Conneaut Outlet, Conneaut Lake, Crawford 
County, May 14, 1908. Cat. No. 61.3315. Specimen 80. 
. 12. Anodontoides ferussacianus (Lea). Shenango River, Linesville, Crawford County, 
Oct. 10, 1907. Cat. No. 61.3127. Specimen 93. 
. 13. Anodonta imbecillis (Say). Leboeuf Creek, Waterford, Erie County, Sept. 14, 
1909. Cat. No. 61.4178. Specimen 102. 
. 14. Ptychobranchus phaseolus (Hildreth). Slipperyrock Creek, Rose Point, Lawrence 
County, Oct. 23, 1907. Cat. No. 61.3116. Specimen 218. 
. 15. Obovaria circulus (Lea). Crooked Creek, Creekside, Indiana County, May 27, 
1908. Cat. No. 61.3269. Specimen 133. 
. 16. Obovaria ligamentina (Lamarck). Allegheny River, Kelly, Armstrong County, 
Oct. 24, 1907. Specimen 157. 
g. 17. Plagiola securis (Lea). Ohio River, Industry, Beaver County, Sept. 23, 1908. 
Cat. No. 61.3567. Specimen 219. 
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