NOTES ON THE NAIAD FAUNA 231 
4. L. fallaciosus (Smith, 1899) Simpson, 1900. 
ccurs somewhat AAA in the Wapsipinicon 
at Independence. 
5. L. higginsti (Lea, 1857) E EIRE 1900. 
ne male example of this puzzling species found in 
the Wapsipinicon at Independence. 
6. L. gracilis (Barnes, 1823) Baker, 1898. 
Rare: Wapsipinicon River. 
T. L. ligamentinus (Lamarck, 1819) Baker, 1898. 
The most common species in the area examined. 
8. L. luteolus Em 1819) Baker, 1898. 
ommon to all drainage systems in thi: section, 
usually in company with the preceding species. 
9. L. parvus (Barnes, 1823) Baker, 1898. 
Bk po abundant locally in the Wapsipinicon at Inde- 
penden 
10. L. rectus mark 1819) Baker, 1898. 
Common: Wapsipinicon and Turkey rivers. 
11. L. ventricosus (Barnes, 1823) Ja ori a 1851. 
A large, almost rayless, ovate form occurs in com- 
pany with smaller, thinner individuals of this very 
variable species in all three river systems ;—this 
latter form resembles Call’s figure of “Unio subo- 
: vatus” in his paper on the Mollusca of Indiana,* 
E but his figure shows the beaks as angular, a char- 
bU acter which he declares constant. In all specimens 
a collected by us, the beaks are evenly rounded. The 
* ovate form seems to be connected by intermediate 
E links with the smaller, broadly rayed form. 
abundant. 
GENUS PLAGIOLA RAFINESQUE 1820. 
e. FL donaciformis di 1828) Baker, 1898. 
Wapsipinicon: rare. 
13 Pl. elegans Tug 1831) Baker, 1898. 
.Occurs rarely in the Wapsipinicon. 
GENUS TRITOGONIA AGASSIZ, 1852. 
14. Tr. tuberculata (Barnes, 1823) Simpson, 1900. 
ery rare: Wapsipinicon river at Fairbank. 
GENUS STROPHITUS RAFINESQUE, 1820. 
i5 Bt. pass (Say, 1829) Conrad, 1853. 
Not common: Wapsipinicon river. 
24th An. Rept. Dept. Geol. and Nat. Hist. Indiana, pp. 335-536, w. 
oat (1899). 
