Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig, 
ORTMANN: A MONOGRAPH OF THE NAJADES OF PENNSYLVANIA 345 
10. Symphynota costata (Rafinesque) Female, gravid (young glochidia). Loyalhanna 
River, Ligonier, Westmoreland County, Aug. 3, 1906. Cat. No. 61.1819. Specimen 
205. 
Left outer gill. 
11. Anodonta grandis gigantea (Lea) Female, gravid (glochidia). Pond, Harmarville, 
Allegheny County, Oct. 10, 1908. Cat. No. 61.3668. Specimen 4 (Same as Pl. 
LXXXVI, fig. 16). 
Posterior part of base of right outer gill. 
12. Ptychobranchus phaseolus (Hildreth) Male. Neshannock Creek, Leesburg, 
Mercer County, Oct. 17, 1907. Cat. No. 61.3114. Specimen 183. 
12a. Left inner gill. 12b. Left outer gill. 
13. Ptychobranchus phaseolus (Hildreth) Female, sterile. Presque Isle Bay of Lake 
Erie, Erie, Erie County, May 22, 1909. Cat. No. 61.4123. Specimen 214. 
Left outer gill. 
. 14. Ptychobranchus phaseolus (Hildreth) Female, gravid (eggs). Mahoning River, 
Mahoningtown, Lawrence County, Sept. 2, 1907. Cat. No. 61.3082. Specimen 247. 
Left outer gill. 
. 15. Obovaria ligamentina (Lamarck) Female, sterile. Cheat River, Cheat Haven, 
Fayette County, Sept. 16, 1907. Cat. No. 61.3018. Specimen 156. 
Right outer gill. 
16. Paraptera gracilis (Barnes). Female, sterile, but just discharged. Ohio River, 
Industry, Beaver County, July 11, 1909. Cat. No. 61.4111. Specimen 210. 
Left outer gill. 
17. Lampsilis luteola (Lamarck) Female, sterile. Little Mahoning Creek, Goodville, 
Indiana County, May 25, 1905. Cat. No. 61.1760. Specimen 159. 
Left outer gill. 
18. Lampsilis luteola (Lamarck) Female, gravid, discharging glochidia. 'Ten-Mile 
Creek, Amity, Washington County, April 22, 1908. Cat. No. 61.8248. Specimen 207. 
Left outer gill. ; 
19. Lampsilis cariosa (Say) Female, sterile. Delaware River, Yardley, Bucks County, 
April 24, 1908. Cat. No. 61.3417. Specimen 166. 
Left outer gill. 
. 20. Lampsilis multiradiata (Lea) Female, gravid, discharging glochidia. Little 
Beaver Creek, Darlington, Beaver County, Aug. 9, 1907. Cat. No. 61.2921. Speci- 
men 163. 
Left outer gull. 
21. Truncilla perpleca rangiana (Lea) Female, sterile. Allegheny River, Godfrey, 
Armstrong County, Aug. 10, 1909. Cat. No. 61.3978. Specimen is; 
Left outer gill. 
