102 PROCEEDINGS OF THE MALACOLOGICAL SOCIEiT. 



BURTONIA. 



Burtonia, Bourguignat: vi, p. 20; iv, p. 37; v, pp. 32-43, 53, 

 pi. xxiv, tigs. 1-4 ; pi. xxv, figs. 1-3 ; pi. xxvi, figs. 1-5 ; 

 pi. xxvii, figs. 1-5 ; Martens, p. 257. 



BuRTONiA Tanganyicensis (Smith). 



Spatha Tanfianyicensis, Smith : i, p. 350, pi. xxxi, figs. 8, 8« ; ii, 



p. 296, pi. xxxiy, fig. 32; Crosse, p. 132. 

 Burtonia Tanqamjikana and Living stoniana, Bourguignat : vi, pp. 20, 



23 ; iv, p. 38. 

 Burtonia Tanganyicensis, Martens: p. 257. 



The following forms have also been figured : B. Lavi(]eri((na, 

 Moineti, subtriangularis, elongata, magnifica, coidorta, Grandidieriana, 

 Living stoniana, and Bourguignati ( Bourguignat, ii). With the exception 

 of the last, I believe they will all prove to be mere varieties of 

 one polymorphous species. B. Bridouxi and Jouherti, Rourg., which 

 have not yet been figured, probably belong to the same category. 

 B. Foai, Mabille (Bull. Soc. Philom., 1901, vol. iii, p. 58), is probably 

 only a variety also. 



Pleiodon Spekei, Woodward. 



Pleiodon Spehi, Woodward: Proc. Zool. Soc, 1859, p. 348, pi. xlvii, 



fig. 2 ; Sowerby, Conch. Icon., vol. xvi, fig. 2 ; Kiister's Conch. 



Cab. {Iridina), pi. Ixx, fig. 1 ; Smith, i, p. 360 ; ii, p. 296 ; 



Martens, S.B. nat. Freunde, Berlin, 1883, p. 71; Pelseneer, 



p. 109 ; anatomy, p. 116, figs. 2, 3. 

 Cameronia Spekei, Bourguignat : Descript. Moll. Egypte, etc., 1879, 



p. 43 ; iv, p. 38. 

 Pliodon {Cameronia) Spekei, Crosse: p. 130. 

 Mutela [Iridina) Spekei, Martens : p. 256. 



The figured so-called species of this genus from Tanganyika are : 

 P. Spekei, Woodward; Coulboisi, Landeaui, paradoxa, Josseti, Bour- 

 guiiinati, admirahilis, gigantea,^om'g\u.gm\i. Unfigured are the following: 

 P. Anceyi, Bridouxt, Charbonnieri, Vynckei, complanata, Bromauxi, 

 Giraudi, Guillemeti, Jouberti, Lavigenana, Locardiana, Mahilliana, 

 Marioniana, Moineti, obtusa, piilchella, Randaheli, and Rcvoiliana, all 

 described by Bourguignat under the genus Cameronia. (See Descript. 

 Moll. Egypte, etc., 1879, p. -42 ; Moll. fluv. Nyanza Oukerewe,^ 1883, 

 p. 19; i, pp. 106-110; Especes nouv. et genres nouv. Oukerewe et 

 Tauganika, 1885, pp. 38-9; IsTouveautes MalacoL, 1886, pp. 66-93; 

 iii, pp. 67-75, pis. xxxi-xxxv.) 



Without having a good series of specimens it is impossible to express 

 any decided opinion with regard to the value of the above numerous 

 so-called species, but even judging from the figures already published, 

 this seems to be another case of a polymorphous species having been 

 split up into many. Dr. E. von Martens has also expressed his doubt 

 with rcsrard to the value of several of these forms. 



