INCISURELLA [I. prima] Cooper 1941,p.32 [Bairdiidae by 
Cooper; ?Healdiidae by Henningsmoen 1953,p.260] 4 
Mississippian of Illinois. 
INDIANA. [3 species: I.eovalis, I.prima, I.lippa; with I. 
lippa selected genotype by Ulrich and Bassler 
1931,p.68-70] Matthew 1902,p.460 [Conchostraca 
by Ulrich and Bassler; Branchiopods by Bassler 
and Kellett 1934,p.336] Cambrian, Cape Breton. i 
ISOCHILINA [2 species, of which Leperditia (Isochilina) 
ottawa was designated by Bassler and Kellett 
1934,p-336] Jones 1858a,p.248;1858c,p.97 
[ Leperditiidae~Isochilininae by Swartz 1949, 
pe321] Ordovician, Canada. i 
ISOCHILINIA Vogdes 1893,p.102, error for Isochilina Jones 
1858. § 
ISOCHILININAE Swartz 1949,p.32l1, a subfamily of Leperditiidde 
for the genera: Isochilina, Hogmochilina, 
Teichochilina, Dihogmochilina, Saffordellina. 
ISOCYPRIS [I. perangusta, I. priomena] G. W. Miiller, 1909, 
pe159 [Cypridae-Cyprinae by Mtiller] Recent,South 
Africa. 
ISOCYTHERE (I. nova] Terquem 1885,p.43 [Platycopa-Cytherellidae © 
by Terquem] Jurassic, France. 
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