THE NAIADES OF MISSOURI 449 
Rivers was pronounced by Mr. Frierson as rosacea DeKay but not 
exactly the author’s shell from the St. Lawrence. Mr. Walker 
comments :—‘'I do not remember of ever having seen a red-nacred 
luteola from the southwest. The Great Lakes form, rosacea DeKay, 
is typically red or rather pink.” 
Lampsilis reeviana (Lea). 
(‘““Reeve’s Shell.’’) 
Not figured nor described. 
1852— Unio reevianus Lea, Tr. Am. Phil. Soc., X, p. 272, pl. XX, fig. 28. 
This species is catalogued through a report of it for Clinton, 
Missouri. The writer has not found it; hence no figure nor descrip- 
tion appears here. Simpson reports this throughout the South- 
west and hence the locality of this State, from which Mr. Walker 
reports as having received his reeviana shell, is within the range. 
Lampsilis ventricosa (Barnes).' 
(‘‘Pocket Book.’’) 
Pl. XXVIII, Figs. 106 A—D. 
1823—Umo ventricosus—Barnes, Am. Jl. Sct:, V1, p.. 267, pl. XIII; 
fig. 14. (in outline). 
1900b—Lampsilis ventricosus Simpson, Pr. U.S. Nat. Mus., XXII, p. 
aie 
ANIMAL CHARACTERS. 
NUTRITIVE STRUCTURES:—Branchial and anal opening papil- 
lose; supra-anal large, closely connected to anal; inner laminae 
of inner gills connected to visceral mass; palpi connected about 
two-thirds of their length antero-dorsad, color of soft parts whitish 
except foot which is pinkish and gills of male and sterile female 
which are light brown, gravid marsupium darker brown, edged 
in blue and black. 
REPRODUCTIVE STRUCTURES :—Marsupium kidney-shaped con- 
' According to Vanatta, l. c., (1915, p. 551), Lampsilis ventricosus 
Bar. (1823) of Simpson’s Synopsis, p. 526, should read Lampsilis cardium 
Raf. since this Species is unquestionably the Lampsilis cardium (Unio 
cardium) of Rafinesque’s Monograph (1820), p. 298, No. 14, Pl. 80, Figs. 
16, 17, 18 and 19, as now identified from Types in the A. N. S. P. Coll., 
No. 20, 210. 
