Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
ORTMANN: A MONOGRAPH OF THE NAJADES OF PENNSYLVANIA 341 
11. Symphynota viridis (Conrad) Probably hermaphrodite, gravid, very young (shell 
31 mm. long) (with eggs and young glochidia). Great Tonoloway Creek, Thompson 
Township, Fulton County, Sept. 5, 1909. Cat. No. 61.4221. Specimen 235. 
lla. Left inner gill. 11b. Left outer gill. 
12. Symphynota costata (Rafinesque) Female, gravid, discharging posteriorly (glochidia). 
Ten Mile Creek, Amity, Washington County, April 22, 1908. Cat. No. 61.3303. 
Specimen 82. ; 
12a. Left inner gill. 12b. Left outer gill. 
13. Anodonta grandis gigantea (Lea) Male, young (shell 37 mm. long). Pond, Har- 
marville, Allegheny County, Oct. 10, 1908. Cat. No. 61.3668. Specimen 231. 
13a. Left inner gill. 136. Left outer gill. 
14. Anodonta grandis gigantea (Lea) Female, sterile, young (shell, 46 mm. long). Pond, 
Harmarville, Allegheny County, Oct. 10, 1908. Cat. No. 61.3668. Specimen 236. 
14a. Right inner gill. 14b. Right outer gill. 
15. Anodonta grandis Say. Female, gravid (eggs), beginning of gravidity. Conneaut 
Lake, northeast shore, Crawford County, Aug. 8, 1908. Cat. No. 61.3657. Specimen 
203. 
Left outer gill. 
16. Anodonta grandis gigantea (Lea) Female, gravid (glochidia), fully charged. Pond, 
Harmarville, Allegheny County, Oct. 10, 1908. Cat. No. 61.3668. Specimen 4. 
Left outer gill (one lamina only). 
