with a revision of thè LimnceidcB of Authors. 
347 
Physo'psis [Africana). 
Animai unknown. 
Shell sinistrally spirai, ovate. Columella truncate, plicate, involute. 
Outer lip simple. 
The truncation of thè columella would seem to indicate important 
differences in thè mantle edge. 
Fig. III. 
Badula of Chilina oralis. — 1. Central Tooth. 1-48. Laterals. 14X. Section 
of 14th lateral. 
Chilina [ovalis Sby). 
Teeth comb-like (see Fig. 3). Central quinquedentate, broad ante- 
riorly. Laterals with thè base prolonged anteriorly, beyond thè 
insertion of thè cusps ; inner edges smooth, arcuated ; outer edges 
denticulated. Jaw none. Formula 48.1.48. 
Tentacles biangulate, rhombiform. Eyes sessile between thè angles. 
Genitalia on thè right side. Fenis short, stout, opening on thè neck 
behind thè right tentacle. Testicle, etc., closely bound up in a mus- 
cular sheath which covers thè male genitalia, as in Siphonaria. Va- 
gina large, ovate, opening on thè neck below thè mantle edge. Pos- 
terior end recurved, oviduct long, slender ; ovaries in thè extremity 
of thè spire. Genital bladder spherical, pedunculated on a very 
long tubular canal. Salivary gland spherical, enormous ; of a yellow 
color. Buccal mass small ; cesophagus slender, crop or stomach vei'y 
small ; descending intestine wound around thè salivary gland and 
opening through thè mantle lobe, as in Siphonaria, on thè right side. 
Li ver moderate, brown. Foot sharply pointed behind. Mantle 
edge provided with a prominent flattened lobe, covering thè opening 
of thè pulmonary cavity, otherwise not extending beyond thè shell. 
Labia produced. Shell dextro-spiral. Columella involute, plicate 
or dentate. Outer lip acute. 
