ORTMANN: monograph of the naiades op PENNSYLVANIA. 219 



The soft parts were described and figured by Lea (Obs. I, 1834, PI. 5, figs. 6, 7), 

 but fig. 7 is m-ong; also (Obs. X, 1863, p. 433). Ortmaim (1912, p. 313, fig. 17), 

 and Lefevre & Curtis (1912, PI. 7, fig. 8). The Glochidia were described by Sterki 

 (1898, p. 19) and figiu-ed by Ortmann (1912, PI. 19, fig. 6) and also by Surber 

 (1912, PL 1, fig. 11). They measure, according to Sterki, 0.21 X 0.17; according 

 to Surber, 0.210 X 0.185; according to Ortmann, 0.18 X 0.15 mm. 



Breeding season: The species is bradytictic according to Lefevre & Curtis 

 (glochidia in November) . Surber found gravid females in October and November. 

 I foimd them with eggs on Sept. 7 and 12, 1914, and Sept. 14, 1915, and Sept. 17, 

 1915, and Sept. 24, 1915. 



Remarks: A well-marked species, distinguished by its somewhat subglobular 

 shape, nodular surface, and the peculiar, mottled character of the color of the 

 epidermis. The shape, however, is rather variable, and also the development of 

 the nodules. The placentae are mostly red, but I have foimd specimens (in Clinch 

 River) with white placentae. 



Localities represented in the Carnegie Museum: 



Ohio River, Industry, Beaver Co., Pennsylvania. 



Allegheny River, Natrona, Allegheny Co.; Aladdin and Godfrey, Armstrong Co., Pennsylvania. 



Tuscarawas River, Ohio (Holland collection). 



Little Miami River, Xenia, Greene Co., Ohio (C. Goodrich). 



Ohio River, St. Marys, Pleasants Co., West Virginia; Parkersburg, Wood Co., West Virginia; Portland, 

 Meigs Co., Ohio; Portsmouth, Scioto Co., Ohio; and Cincinnati, Hamilton Co., Ohio (Juny col- 

 lection). 



Cumberland River, Cloyds Landing and Albany Landing, Cumberland Co., Kentucky (B. Walker, donor). 



Tennessee River, Tuscumbia, Colbert Co., and Florence, Lauderdale Co., Alabama (H. H. Smith); 

 Knoxville, Knox Co., Tennessee (Hartman collection). 



Holston River, Mascot, Knox Co.; Hodges, Jefferson Co.; Turley Mill, Grainger Co., Tennessee. 



Clinch River, Sol way, Knox Co.; Edgemoor, Clinton, and Offutt, Anderson Co.; Black Fox Ford, Union 

 Co.; Clinch River Station, Claiborne Co., Tennessee. 



Distribution and Ecology (See fig. 22): Type locality, Ohio River (Rafinesque) . 



In Pennsylvania this species has been found in the Ohio and lower Allegheny. 

 All specimens collected by myself (only seven) were dead shells, but some of 

 them were quite fresh. However, this species must once have also existed in the 

 Monongahela, at least as far up as the mouth of Cheat River, for I have found 

 specimens in an old Indian garbage heap,"' opposite Point Marion (See Ortmann, 

 1909c, p. 13). 



According to Simpson (1900) it belongs to the Ohio, Cumberland, and Temies- 

 see Rivers, and is mamly restricted to these large rivers, and a few of their larger 



'■•^ Kitchen-midden. Editor. 



