348 MR. E. A. SMITH ON SHELLS [-A-pr. 20, 



7. Ampullaria ovata, Olivier. 

 Ampiillariaovata.OYniei; Philippi in Kiister's Con. Cab. pi. 14. 



f. 5-G ; Reeve, Con. Icon. f. (J4. 



A. Jcordofanu, Parreyss, Philippi, /. c. pi. 13. f. 1. 



The more globose form of this species {kordofana) is the one re- 

 ceived from Mr. Hore at Tanganyika. The epidermis of all the 

 specimens is of a peculiarly dark, olive tint. 



8. Melania (Melanella) nassa. Woodward, Proc. Zool. Soc. 

 1859, p. 349, pi. 47. f. 4; Reeve, Conch. Icon. fig. 216; Brot. 

 Conchyl. Cab. pi. 6. f. 7. 



Among several specimens sent by Mr. Hore, one is especially 

 worth referring to. It is exceptionally elongated, and, although un- 

 doubtedly belonging to this species, at first sight looks distinct. Its 

 dimensions are — length 14 millims., diam. 6| ; aperture only (5 

 long, 3 1 wide. 



Another specimen is 20 millims. long, 10 broad, and its aperture 

 has a length of 11 millims. and a width of C^. 



TiPHOBiA*, nov. gen. 



Shell subturbinate ; spire depressed ; whorls flattened above, 

 angulated and spinose ; axis and aperture prolonged into a channelled 

 beak ; epidermis none. Operculum ? 



The character of the prolonged axis is very similar to that ob- 

 taining in several species of the genus lo. The great difference of 

 form and the absence of an epidermis are, I think, sufficient dis- 

 tinctions to warrant a generic separation. Not knowing the animal 

 or its operculum, it is impossible to say to what family it belongs ; 

 but it may temporarily be classed with the Melaniidse. 



9. TiPHOBiA HOREi. (Plate XXXI. figs. 6-6 5.) 



Shell somewhat turbinate, with a short turreted spire, prolonged 

 inferiorly into a narrow rostrum, thinnish, semitransparent. Whorls 

 G, flattened above, rectangular, and keeled in the middle, with rather 

 long, tapering, hollow compressed spines arising from the ktel and 

 directed slightly upward. Sculpture consisting of fine close spiral or 

 transverse lirulte crossed by obliquely flexuous lines of growth, 

 which, towards the aperture, are particularly strongly marked, 

 forming fine plications. Aperture irregidarly pyriform, lined with a 

 bluish-white and glossy enamel, together with the basal beak occu- 

 pying about f^ of the entire length of the shell. Columella nearly 

 straight, only faintly arcuate in the middle, and a trifle bent to the 

 left beneath, covered with a smooth dirty- white callosity extending 

 over the whorl, and joining the Hp at its upper extremity ; the 

 latter is shallowly siuuated above and below the angle, and arcu- 

 ately prominent about and beneath the middle. Rostrum a little 

 oblique and scarcely recurved, shallowly grooved. The colour may 

 be described as dirty or greyish transparent white feebly tinted with 

 1 From rl^os, a poud, and /3toai, to live. 



