Ortmann: Familii \m> Genera oi Najades, -~> : '> 



Quadrula mortoni (Conrad). 



Three males and two females, one ol the latter gravid, from Bayou 

 Pierre, De Soto Parish, Louisiana, collected by L. S. Frierson, Any,. 6, 

 [910. 



Agreeing in every detail with pustulosa and spharica, to which it is 

 allied. 'The inner i^l^r oi the anal opening is almost smooth. 



In the gravid female, eggs and glochidia were present, the latter 

 of the usual shape, of medium size, subovate, without hooks. The 

 glochidia are quite young and their shape is not very distinctly seen. 

 They were of whitish color, and distributed in an irregular way in 

 certain ovisacs both of the outer and inner gills, many ovisacs being 

 empty. No exact measurements of the glochidia can be given. 



The date for the breeding season should be noted. 



Quadrula lachrymosa (Lea). 



One male and four females from the Wakarusa River, Lawrence, 

 Douglas Co., Kansas, received from K. L. Moodie, and one female 

 collected by myself in the Ohio River, at St. Marys, Pleasants Co., 

 West Virginia. Xo gravid females have been seen. 



Soft parts described by Simpson (cf. Baker, 1898, p. 84). 



similar to the preceding species. Inner edge of the anal opening 

 irregularly and indistinctly crenulated, almost smooth. Posterior 

 margins of palpi connected for over one-half, almost two-thirds, of 

 their length. 



All four gills are marsupial, septa of the inner ones slightly less 

 crowded than those of the outer ones (see Plate XVIII, fig. 1). 



Soft parts whitish. 



Quadrula aspera (Lea). 



Three males, one female (all small, or of medium size) from Bayou 

 Pierre, De Soto Parish, Louisiana, collected by L. S. Frierson, and one 

 very large female from Pearl River, Jackson, Hinds Co., Mississippi, 

 collected by A. A. Hinkley. 



An incomplete description is given by Lea (Obs., X, 1863, p. 



437)- 



Agreeing in every respect with Q. lachrymosa, to which it is closely 

 allied. Even the minor details (anal opening, palpi, etc.) are abso- 

 lutely identical. No gravid females have been seen. 



