Weller and Knight 1942,p.256,257- See Roth 
1929¢e for full description of genus. 
GRAVIA [Gravia(Gravia)aculeata, and Gravia(Gravia)volgaensis] 
GRAVIINAE 
Polenova 1952,p.83 [Acronotellidae-Graviinae by 
Polenova] Devonian, USSR. [compared to Menoceratella, 
Tricornina and Saccelatia] G. aculeata was not 

figured; G. (G.) volgaensis, described p.85,pl.2, 
fee 
Polenova 1952,p.82, a subfamily of Acronotellidae, 
for the genus Gravia, with subgenera Gravia and 
Russia [and apparently for Selebratina, Sulcatia, 
and Lunularia] Silurian to Carboniferous. 
GUTSCHICKIA [Whipplella ninevehensis Holland 1934,p.345,pl.25, 
f.3a-c] Scott 1944a,p.146 [Cypridae by Scott] 
Permian of Pennsylvania. 
HABROCYTHERE [H. fragilis] Triebel 1940,p.165 (Cytheridae-- 
Cytherideinae by Triebel] Cretaceous, Germany. 
HALLATIA [H. healeyensis] Kay 1934,p.335 [Primitiidae-- 
Eurychilininae by Kay 1940a,p.253; Drepanellidae-- 
Ulrichiinae by Schmidt 1941,p.51; Beyrichiacea of 
uncertain family by Henningsmoen 1953, pe2h8, 
273] Ordovician, Ontario. 
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