THE NAIADES OF MISSOURI 399 
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 as 
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.) 
1834—Umnto glans Lea, Tr. Am. Phil: Soc., p. 82; Pl. 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 (1912, 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.; 
tg00b, Simpson, Pr. U. S. Nat. Mus., XXII, p. 534 (as section); 1912b, 
Ortmann An. Car. Mus., VIII, p. 336 (as gents). 
