Mr. Yj. a. Smith on African Mollusca. 323 



4. Demoulia ahhreviata (Gmeliii). 

 Ilah. Cape Colony. 



5. DeinoitJw japonica, A. Ad. 

 II(i/>. Japan. 



6. Demoulia ringens, A. Ad. 

 Hah. ? 



7. Demoulia i:)yramidalis^ A. Ad. 



77rtJ. Port Elizabeth, Sontli Africa [Marrat and Sowerhf). 

 The locality " Japan " originally assigned to this si)ecie3 

 still wants confirmation. 



The first five of the preceding species form a group which 

 may be of equal value with the numerous sections or sub- 

 genera into which the genus Nassa has been divided, and to it 

 the name Demoulia may be assigned, and the last two, being 

 of difterent form, Avill fall into other groups. 



III. Xeothauma. 



Through the energy of Capt. E. Coode Hore the British 

 Museum has obtained two specimens of this Tanganyikau 

 genus preserved in spirit. The animal may be thus 

 described : — 



Foot short, as broad as long, front margin double-edged, a 

 little wider tlian behind, of a slaty-grey colour beneath and 

 at the sides, also beneath the operculum when removed. 

 Head, tentacles, neck-lappets, and front margin of the mantle 

 of the same tint. Tentacles short, broad, horizontally com- 

 pressed at the base, tip pointed and apparently not produced 

 much beyond the eyes, situated on sligiit lateral prominences. 

 Left neck-lappet moderate ; right very large, folded, forming 

 a distinct branchial siphon. The upper margin is reflexed 

 under the right tentacle and produced under the rostrum as 

 far as the mouth, forming as it were a third lappet. Rostrum 

 shortish, blunt. The radula, kindly mounted and examined 

 by my colleague Mr. B. B. Woodward, has the formula 3. 1.3, 

 and is of the same type as that of Viviparus. 



From the above description it will be seen that the animal 



