SMITH : MOLLUSCA OF LAKE TANGANYIKA. 



87 



Para MELA NiA Damoni (Smith). 



Tiphohia {Paramelanid) Damoni, Smith: ii, p. 559, fig. 1. 

 Paramelania Damoni, Bourguignat : ii, pi. xiv, fig. 17; iii, p. 200; 



Martens, p. 209; Martel & Dautzenberg, p. 177, pi. viii, 



fig. 22 ; Moore, ii, pp. 243-5, figs, 25, 27, and fig. on p. 345 ; 



i, pi. xxiii, fig. 1. 

 Melania Damoni, Pelseneer: p. 108. 

 Bourgiiignatia imperialis, Giraud : Bull. See. mal. France, 1885, 



p. 194, pi. vii, figs. 5-7; Bourguignat, i, p. 67; ii, pi. xii, 



figs. 8-10; iii. p. 169. 

 Paramelania imperialis, Martel & Dautzenberg : p. 178, pi. viii, 



figs. 23, 24, vars. Guillemei and Mpalaensis. 

 P. {Bourguigyiatia) imperialis, Martens : p. 207. 



Bourgiiignatia imperialis, the type of the genus, seems to me 

 absolutely synonymous with the present species. In a large series 

 of specimens which I have examined I find all the connecting links 

 between the shells originally described under these two names. There 

 is considerable variation in the size of the specimens, the largest being 

 39 mm. in length, whereas the smallest, but equally adult example, is 

 only 21. The plicae vary in number from 10 to 15, and some are 

 much more acutely spined at the angle than others. 



Paramelania Beidouxi (Bourguignat). 



Bourguignatia Bridouxi, Bourguignat: ii, pi. xii, figs. 1-4 ; iii, p. 166 ; 

 Nicolas, C.R. Assoc. Prangaise, 1898, 2^ partie, p. 516, fig. 4. 

 Paramelania {Bourguignatia) Bridouxi, Martens: p. 207. 

 Yar. = P. Jouherti, Bourguignat: ii, pi. xii, figs. 5-7 ; iii, p. 168. 



This species does not appear to have been obtained by Mr. Moore. 

 It is remarkable on account of the planulate or even concave upper 

 part of the whorls. 



Paramelania crassigranulata. Smith. 



Tiphohia {Paramelania) crassigranulata, Smith : ii, p. 560, fig. 2. 



VOL. VI. — JUNE, 1904. 7 



