204 PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 
STREPTAXIS, Gray. 
Streptaxis, Gray: Mag. Nat. Hist., n.s., vol. 1 (1837), p. 484. 
Shell oval, heliciform, but often oblique, profoundly umbilicated, 
ridged, striate above, smooth and usually polished below, last whorls 
usually deviating more or less from the original axis; aperture lunar, 
with or without teeth, lip slightly thickened and reflected. 
The animal has a very long neck and short tail; the superior 
tentacles are narrow and long; the labial palpi narrow, as long as the 
inferior tentacles ; genital orifice on the right side, distant from the 
superior tentacle, and closer to the respiratory orifice. Dentition 
similar to that of Glandina; central tooth simple (Tryon). 
Section I. FHusrrerraxis, Pfeiffer. 
Axis of the shell oblique, owing to the fact that some of the whorls 
are inclined obliquely to the rest. 
Subsection 1. dentule (=b. genuine), Pfeiffer. 
Mon. Helic., vol. i (1848), p. 83, =Artemon, Pfr., Malak. Blatt., vol. 1 
(1856), p. 172, in part, not Artemon, Beck. + Gonaxts, Taylor, 
Journ. Conch., vol. 1 (1877), p. 252. -+- Lamerrierer and OopHana, 
Ancey, Le Naturaliste, 1882, p. 399. -+ Atcrpra, Bourg., Moll. 
Afr. équat., 1889, p. 46. + Marconra, Bourg., op. cit., p. 135. 
1. SrrepraxiIs NoBILIS, Gray. 
Streptaxis nobilis, Gray: Mag. Nat. Hist., n.s., vol. 1 (1837), p. 485, 
figs. 60a, 6; Troschel, Wiegm. Arch, Naturg., vol. iv, pt. 2 
(1838), p. 274; Philippi, Abbild. & Beschr., vol. 1 (1843), p. 48; 
Pfr., Mon. Helic., vol. i (1848), p. 4; id., Chemn. Conch. Cab., 
2nd ed., Helix, vol. ii (1854), p. 395, pl. exlix, figs. 10, 11; 
Chenu, Man. de Conch., vol. 1 (1859), p. 451, fig. 3361; Tryon, 
Man. Conch., ser. 1, vol. i (1885), p. 67, pl. xii, figs. 53, 54, 
61, 62. 
Helix Monrovia, Rang: Ann. Sci. Nat., vol. xxiv (1831), p. 16, 
pl. iii, fig. 3; Philippi, Abbild. & Beschr., vol. 11 (1846), Helix, 
p. 85, pl. vii, fig. 9: Pfr., Mon. Helic., vol. 1 (1848), p: 85. 
Streptaxis Monrovia, Mart.: Malak. Blatt., vol. xii (1866), p. 104 ; 
Dohrn, tom. cit., p. 136, vol. xxii (1875), p. 2083; Chemn., 
Conch. Cab., 2nd ed., Helix, vol. iii (1853), p. 355, pl. exxxvi, 
figs. 5, 6; Pfr., Mon. Helic., vol. 1 (1853), p. 81. (Status 
juvenilis. ) 
Streptaxis Monroviana, Dohrn: Nov. Conch., vol. v (1877), p. 26, 
pl. exln, figs. 1-6. 
Helix Blandingiana, Lea: Trans. Amer. Phil. Soc., ser. m, vol. vi 
(1841), p. 459, pl. xii, fig. 9. 
Streptaxis Blandingiana, Pfr.: Mon. Helic., vol. i (1848), p. 4. 
Helix Reclusiana, Petit: Revue Zool., 1841, p. 99; Fer., Hist., 1851, 
p. 393, pl. xev, fig. 1. 
Streptaxis Reclusiana, Pfr.: Symb., vol. ii (1842), p. 110; Philippi, 
Abbild. & Beschr., vol. ii (1846), Helix, p. 128, pl. viii, fig. 3; 
