THE NAIADES OF MISSOURI 1 67 



the Specimens of the above measurements are a near approach, 

 at least, to this species. However, this species is listed for Mo. 

 more on the strength of Mr. Simpson's report of it for Harrison 

 County, Missouri, where the famous author of the "Synopsis 

 of the Naiades" used to reside. He states that texasensis ranges 

 north into northern Missouri, southern Illinois and Indiana. 

 This species is a good one and should be shut out of the synonomy 

 of parva especially because its posterior end of shell is never 

 evenly ' rounded, nor is its epidermis as cloth-like and nacre a- 

 white as that of parva. The sex dimorphism, too, is different, 

 as determined by the above description of shell. 



Carunculina glans (Lea). 

 ("Little Purple.") 



(Not figured.) 



1S34 — Unio glans Lea, Tr. Am. Phil. Soc, p. 82, PI. VIII, fig. 12, 

 Obs. X, 1863 p. 402. 



1900b — Lampsilis glans Simpson, Pr. U. S. Nat. Mus. XXII, p. 565. 



1912b — Eurynia {Carunculina) glans Ortmann, An. Car. Mus., VIII, 

 P- 339- 



Animal and Shell Characters: — Since the writer has not 

 secured any actual shells or soft parts for this species the descrip- 

 tions of these parts do not appear here. 



Miscellaneous Remarks: — The writer would also lay 

 claim to this species for Missouri from Simpson's report of it 

 for the White River, and also from a few scattered reports of it 

 through some local collectors for the Elk River and other Southern 

 Missouri streams. From Lea's description (Obs. X., 1863, pp. 

 402 and 405) and also from Wilson and Clark's (191 2, p. 48) 

 this species falls under this genus. From shells received by the 

 writer in exchange it would seem to be more nearly like a young 

 P. purpurata. It is distinguished from C. parva in being a wider, 

 shorter, thicker, heavier and more polished shell and also in 

 possessing a prominent post-umbonal ridge and a coppery and 

 purple nacre. 



Genus Eurynia Rafinesque. 

 (Type, Unio recta, Lamarck.) 



18120 — Eurynia Rafinesque Monog., Ann. Gen. Sci Phys. Brux.; 

 1900b, Simpson, Pr. U. S. Nat. Mus., XXII, p. 534 (as section); 1912b, 

 Ortmann An. Car. Mus., VIII, p. 336 (as genus). 



