LIST OF ILLUSTRATIONS. 



Lingual dentition of Typhobia horei, Fig. 4 



Semi-diagram of anatomy of Typhobia horei, Fig. 5 



Section of otocyst of Typhobia horei, Fig. 6 



Part of the mantle cavity of Typhobia horei, Fig. 7 



Bathanalia howesi shell, Fig. 8 



Operculum of Bathanalia, Fig. 9 



Lingual teeth of Bathanalia, Fig. 10 



Shell of Chytra kerkii, Fig. 1 1 



Living animal of Chytra, Fig. 12 



Nerves of apporrhais pes pelicani, Fig. 1 3 



Lingual teeth of Chytra, Fig. 14 



Nerves of chytra, Fig. 15 



Operculum of Chytra, Fig. 16. 



Shell of Limnotrochus, Fig. 1 7 



Operculum of Limnotrochus, Fig. 18a 



Lingual dentition of Limnotrochus, Fig. 1 



Nerves of Limnotrochus, Fig. 19 



Stomach of Limnotrochus, Fig. 20 . 



Shell of Bythoceras, Fig. 21. 



Lingual dentition of Bythoceras, Fig. 2 2 



Nerves of Bythoceras, Fig. 23 . 



Bythoceras minor shell, Fig. 24 



Lingual dentition of Taramelania damoni, Fig. 25 



Lingual dentition of Taramelania cranigranuluta, Fig. 26 



Shell of Taramelania damoni, Fig. 27 



Shell of Tanganyicia rufofilosa, Fig. 28 



Semi-diagram of Tanganyicia rufofilosa, Fig. 29 



Lingual dentition of Tanganyicia rufofilosa, Fig. 30 



Nerves of Tanganyicia rufofilosa, Fig. 3 1 



Semi-diagram of Tanganyicia rufofilosa, Fig. 32 



Shell of JVassopsis nana, Fig. 33 



Semi-diagram of JVassopsis nana, Fig. 34 . 



Animal of JVassopsis, Fig. 35 . 



Lingual dentition of JVassopsis nana, Fig. 36 . 



Nervous system of JVassopsis, Fig. 37 



Operculum of Nassopsis, Fig. 38 



Shell of Spekia zonata, Fig. 39 



Lingual dentition of Spekia zonata, Fig. 40 



