THE GASTROPODA 189 
FamiLy 1. Oxneactntpar, Adams. Shell oval, elongated, with a 
narrow aperture ; neck very long; labial palps prominent. Genera— 
Oleacina, Bolton (= Glandina) ; aperture truncated anteriorly ; columella 
smooth.  Streptostyla, Shuttleworth ; columella with a fold; aperture 
elongate, not truncated anteriorly. Faminy 2. TEsTacELLIDAE, Gray. 
Shell globular or auriform, external or partly covered by the mantle. 
Genera—Streptaxis, Gray ; shell external, heliciform, the last whorls 
generally set obliquely to those first formed. Gbbulina, Beck; shell 
cylindrical, umbilicated. Aerope, Albers ; shell external, globular, with a 
small umbilicus ; radular sac enormous; from South Africa. Rhytida, 
Albers ; shell depressed, with a very wide umbilicus ; from New Zealand. 
Daudebardia, Hartmann ; shell coiled, only occupying the posterior part 
of the body ; animal limaciform ; the genital orifice situated between the 
right tentacle and the shell (Fig. 172, B). Testacella, Cuvier (Fig. 172, C) ; 
shell small, auriform, situated at the posterior extremity of the limaciform 
body ; genital orifice near the right tentacle. Chlamydophorus, Binney ; 
shell plate-shaped and nearly completely covered by the mantle. Schizo- 
glossa, Hedley. Famity 3. Rarnourstpar, Heude. Animal naked, 
devoid of a shell, with a carinated mantle covering the whole body ; male 
and female orifices distant ; the female orifice near the anus. Genera— 
Rathouisia, Heude. Atopos, Simroth, 
TRIBE 3. ELASMOGNATHA. 
The jaw with a well-developed dorsal appendage. 
Faminty 1. SuccinEmpDArE, Chenu. Anterior tentacles much reduced ; 
male and female orifices contiguous but distinct ; shell thin, spiral, with 
a short spire. Genera—Succinea, Draparnaud ; shell external, oblong, 
with a large aperture; British. Homalonyx, d’Orbigny ; shell auriform, 
the spire scarcely projecting ; the edges of the shell covered by the 
Fic. 178. 
Aneitea macdonaldi, Gray, left-side view. pa.c, pallial cavity; ps, pneumostome ; is 
tentacle. (After MacDonald.) 
mantle ; animal limaciform ; American. Hyalimax, Adams; shell oval, 
wholly internal. Neohyalimax, Simroth. Faminy 2. JANELLIDAR, Gray. 
Limaciform animals, with an internal rounded shell; the mantle very 
small and triangular ; the pulmonary chamber with tracheae ; no anterior 
tentacles. Genera—Janella, Gray. Aneitella, Cockerell. Aneitea, Gray 
(Fig. 178). Triboniophorus, Humbert. All from the Australo-Zelandic 
region. 
TRIBE 4. DITREMATA. 
Male and female genital orifices distant (Fig. 59, 0,f, 0.m). 
Famity 1. VERONICELLIDAE, Gray. Terrestrial, naked, limaciform 
