THE NAUT1LCS. 21 



seems that in lower latitudes the breeding time does not depend 

 strictly on the season. For instance, I have a gravid female, with 

 eggs, of Fusconaja undata (Barnes) from the Ouachita River, Arka- 

 delphia, Clark Co.. Arkansas, collected by H. E. Wheeler on Sep- 

 tember 3, 1912, while another one, recorded previously (Ortmanm 

 1912, p. 241) was obtained in the same condition March 21, 1911. 



F- askewi has a short mantle connection between anal and supra- 

 anal, which was absent (torn?) in a few cases. Anal with very fine 

 papillae, branchial with distinct papilla?. Inner lamina of inner gills 

 free from abdominal sac, except at anterior end. Posterior margins 

 of palpi connected for about one-half of their length or a little less. 



In the female, all four gills are marsupial. Placentae well devel- 

 oped, subcylindrical, and, according to a communication from Frier- 

 son, red " in most cases." Glochidia without hooks, semielliptical, 

 higher than long. Length, 0.13, height, 0.15 mm. 



Color of soft parts partly destroyed in alcohol, but there are indi- 

 cations that mantle edge, adductors, and foot, had a more or less 

 pronounced tendency to be orange-brown. Frierson informs me, 

 that in life the soft parts may be orange or whitish. 



This species clearly belongs in the undata-trigona-rubiginosa 

 group, and is not at all related to the species with which it has been 

 placed by Simpson (1900, p. 786), at any rate, it is not related to 

 Elliptio beadleianus (Lea) (see Ortmann, 1. c. p. 268), although it 

 resembles this species somewhat in the shell; but this is clearly a 

 case of convergency. 



CRENODONTA PEKPLICATA (Conrad) (See Ortmann, 1912, p. 248). 



A gravid female, with glochidia, was received from H. E. Wheeler, 

 from the " Old River " of the Ouachita River, Arkadelphia, Clark 

 Co., Arkansas, collected June 26, 1911. Another discharging 

 female, is at hand from Sabine River, Logansport, De Sota Par., 

 Louisiana, collected by L. S. Frierson, August 1, 1912. 



Also in this species the breeding season seems to be subject to 

 considerable variation : ripe glochidia are present as early as June 

 26, and as late as August 6. 



The glochidia of the present specimens are absolutely like those 

 observed previously. Length, 0.20; height, 0.21 mm. 



QUADRULA PUSTULATA (Lea) (See Simpson, 1900, p. 781). 



Wabash River, New Harmony, Posey Co., Indiana, collected 



