pt. 1884  Popanoceras Hyatt: 337.
     1888  Stacheoceras.- Gemmellaro: 19.
     1889  Popanoceras.- Karpinsky: 67.
     1903  Popanoceras.- Smith: 132.
     1915  Popanoceras.- Haniel: 88.
     1917  Marathonites.- B÷se: 133.
     1927  Marathonites.- Smith: 44.
     1937  Marathonites.- Plummer & Scott: 131.
     1937  Peritrochia.- Plummer & Scott: 151.
pt. 1938  Kargalites.- Ruzhentsev: 259.
     1940  Peritrochia.- Miller & Furnish: 121 [see MEM5360].
     1947  Peritrochia.- Miller & Youngquist: 12.
     1950  Peritrochia.- Miller & Downs: 210.
     1957  Peritrochia.- Treatise: L53.
     1960  Peritrochia.- Ruzhentsev: 227.
     1962  Peritrochia.- Osnovy: 392.
     1972  Peritrochia.-Davis: 88 [with mature modifications].
     2002  Peritrochia.-Leonova: S83.

Type species: Peritrochia erebus Girty, 1908, p.498 [M].

[Miller & Furnish, 1940, p.122: In the genotype and closely similar forms the conch is subglobular, the whorls are depressed and broadly rounded ventrally, and the umbilicus is small. The living chamber is about one volution in length. The conch does not bear prominent ornamentation, but the internal mold is in most cases marked by sinuous transverse constrictions. The moderately conspicuous growth-lines form shallow ventral and lateral sinuses. In at least the genotype an apertural constriction is developed at full maturity.

The sutures form a large bifid ventral lobe, several smaller lobes on the flanks of the conch, several narrow internal lateral lobe, and a deep dorsal lobe. At least the first three lateral lobes of the external suture are digitate, being bifid, trifid, or quadrifid. In some forms the internal lateral lobes, the dorsal lobe, and the prongs of the ventral lobe are subdivided. On each side of the conch three or four lobes in both the external and the internal sutures have been developed by the subdivision of a single large lateral lobe in each case].