TETRAGONODON [Bradycinetus ctenorhynchus Brady 1881-1886, 
Fonds, 1V,p.199,p.12,f.3-5; ?= Tetragonodon 
etenorhynchus Brady & Norman n.sp.e1896. Also 
Tetragonodon erinaceus Brady and Norman; genotype 
not indicated] Brady and Norman 1896,p.667 
[Cypridinidae by B&N; = Philomedes by G. W. Miller 
1912,p.33; Genus good, but possibly as subgenus 
of Philomedes by Skogsberg 1920,p.348] Recent off 
Moroccoe 
TETRASACCULUS [T. bilobatus] Stewart 1936,p.744 ([Primitiidae 
by Stewart; Hollinidae by Henningsmoen 1953, 
pe270] Devonian, Ohio. 
TETRASTORTHYNX [T. diabolicus] Kesling 1953a,p.195 [Dre- 
panellidae by Kesling] Devonian, Ontario. 
TETRASULCATA [T. fluens] Matern 1929,p.40 [Beyrichiidae by 
Matern; Kloedenellidae? by Swartz 1936,p.549; 
Beyrichiacea of uncertain family by Henningsmoen 
1953,pe274) Devonian, Germany. 
TETRATYLUS [T. ellipticus] Cooper 1941,p.34 [Bairdiidae by 
Cooper; ?Healdiidae by Henningsmoen 1953,p.260] 
Mississippian of Illinois. 
THALMANNIA [T. sumatrensis] LeRoy 1939,p.272 [Cytheridae by 
LeRoy; Cytheridae-Cytherinae by Van den Bold 1946, 
p.e32] Miocene, Sumatra. 
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