with a revision of the Limnceidce of Authors. 347 



Physopsis (Africana). 



Animal unknown. 



Shell sinistrally spiral, ovate. Columella truncate, plicate, involute. 

 Outer lip simple. 



The truncation of the columella would seem to indicate important 

 differences in the mantle edge. 



Fio. III. 



Rulula of ChUina ovalis.—l. Central Tooth. 1-48. Laterals. 14X. Section 



of 14th lateral. 



Chilina (pvalis Sby). 



Teeth comb-like (see Fig. 3). Central quinquedentate, broad ante- 

 riorly. Laterals with the base prolonged anteriorly, beyond the 

 insei-tion of the cusps ; inner edges smooth, arcuated ; outer edges 

 denticulated. Jaw none. Formula 48.1.48. 



Tentacles biangulate, rhombiform. Eyes sessile between the angles. 

 Genitalia on the right side. Penis short, stout, opening on the neck 

 behind the right tentacle. Testicle, etc., closely bound up in a mus- 

 cular sheath which covers the male genitalia, as in Siphoinirin. Va- 

 gina large, ovate, opening on the neck below the mantle edge. Pos- 

 terior end recurved, oviduct long, slender ; ovaries in the extremity 

 of the spire. Genital bladder spherical, pedunculated on ;i \n\ 

 long tubidar canal. Salivary gland spherical, enormous ; of a yellow 

 color. Buccal mass small; oesophagus slender, crop or stomach very 

 small ; descending intestine wound around the salivary gland and 

 opening through the mantle lobe, as in Siphoiiarin, on the right side. 

 Liver moderate, brown. Foot sharply pointed behind. Mantle 

 edge provided with a prominent flattened lobe, covering the opening 

 of the pulmonary cavity, otherwise not extending beyond the shell. 

 Labia produced. Shell dextro-spiral. Columella involute, plicate 

 or dentate. Outer lip acute. 



