THE NAUTILUS. 



119 



slightly differing from one another, agree well with Lea's orig- 

 inal figure. The female has never been figured. According to 

 these specimens, the species would be an Eurynia, subgenus 

 Micromya, but the papillae of the mantle margin are very poorly 

 developed. They may be larger in gravid females.'' With 

 this identification Dr. Walker is satisfied. See Nautilus, vol. 

 XXX, p. 54. 



Carunculina texasensis (Lea). Ouachita and Old Rivers; 

 Terra Noire Creek; Caddo River; Big Deceiper Lake. Common. 



Carunculina parva (Bar.) Ouachita and Old rivers; Caddo 

 River; Terra Noire Creek at Mount Zion; Big Deceiper creek at 

 Gum Springs; Big Deceiper Lake. The shells from the last 

 named locality are different from the usual form, but are not 

 " corvinus," as at first supposed. 



Carunculina glans (Lea). Ouachita and Old rivers; Terra 

 creek at Mt. Zion; Caddo River near Arkadelphia. Rare. 

 These shells have an unusual cream-colored nacre, but in other 

 respects are entirely typical. 



Caruncidina cromwellii (Lea). Big Deceiper creek, Gum 

 Springs; Big Deceiper Lake; Terra Noire Creek; Caddo River, 

 near Arkadelphia. The beak sculpture agrees exactly with 

 cromwelli% and the identification is well confirmed. The beaks 

 are unusually perfect. ''This is another example of the re- 

 markably close relationship that exists, without as yet a suffi- 

 cient explanation, between the fauna of Arkansas and Ala- 

 bama. ' ' Walker in letter. 



Proptera purpurata (Lam.). Ouachita and Old River. Com- 

 mon. See Ortmann, Ann. Car. Mus., VIII, 1912, p. 334. 



Paraptera gracilis (Bar. ). Ouachita River below Arkadelphia, 

 and Skillern's Shoals; Old River. See Ortmann, Ann. Car. 

 Mus., VIII, 1912, p. 331. 



Lampsilis leptodon Raf. A rare shell collected only at Skil- 

 lern's shoals and in one place below Arkadelphia. So far we 

 have been unable to secure gravid females. This species de- 

 lights in burrowing under sharp and rather heavy rocks in the 

 swiftest part of the current, and it is with difficulty that any 

 specimens are secured. 



Obovaria castanea (Lea). Ouachita River below Arkadelphia, 



