THE NAUTILUS. 141 



Alabama drainage system, but Simpson states that Lea, him- 

 self, had identified certain shells from the Clinch River as that 

 species. This may have been the source of the erroneous com- 

 parison. At any rate, in the collection of the late Mrs. George 

 Andrews were shells from the Holston River, which had been 

 identified by Marsh as hartmanianum, and it seems probable 

 that it was with such shells that the comparison was made. 

 These shells are identical with the form that he subsequently 

 described as Q. beauchampii. Both this species and his Q. an- 

 drewsii are hardly distinguishable from globata Lea and pilaris 

 Lea and, indeed, all of these forms, together with lesueurianus 

 Lea, form a natural group of inosculating races, which ma}' 

 represent simply a phase of subrotundum Lea. In the French 

 Broad, Tellico and Hiawassee rivers there is found a form that 

 is more compressed than typical pilaris and which would seem 

 to be nearer to lesueurianus. It is with this form that missouri- 

 ensis is most closely allied and, until a final and authoritative 

 disposition can be made of the entire group, it must be con- 

 sidered as the western representative of that very perplexing 

 aggregation . 



STUDIES IN NAJADES. 



BY A. E. ORTMANN. 



(Continued from page 131.) 

 CARUNCULINA TEXASENSIS (Lea) (See Ortmann, 1912, p. 339). 



I have specimens from the Old River of the Ouachita River, 

 Arkadelphia, Clark Co., Ark., among them gravid females, 

 collected by H. E. Wheeler on July 17, 1911, which had in 

 part eggs, in part young glochidia, and females with eggs col- 

 lected August 20, 1912. L. S. Frierson sent gravid females 

 with eggs and ripe glochidia, collected August 1, 1912, in 

 Sabine River, Logansport, De Soto Par., La. Thus also here 

 the breeding season remains obscure, but conditions might be 

 the same as in C. parva. A specimen from Logansport, col- 

 lected Aug. 1, was discharging. 



