HO. 1205. SYNorsrs or THE XAI //>/;.<? srursox. 907 



hinge edentulous, filiform, with two ligaments, one internal, the other 

 external; there are three groups of muscular impressions and several 

 dorsal scars running in a row from the beak forward and downward; 

 upper border of the left valve projecting over that of the right, forming 

 a sinuous wing. 

 Animal unknown. 



BRAZZ^EA ANCEYI Bourguignat. 



* Brazzcua anceyi BOUUGUIGNAT, Esp. Ouk.et Tan., 1885, p. 33; s Icon., 1888, pi. 



xxvin, figs. 1-4. * VON MARTENS, Beach., 1897, p. 258. 



* Brazzcea eximia BOUUGUIGNAT, Un. et Ir. Tan., 1886, p. 57; * Icon., 1888, pi. 



xxix, fig. 5. 



Lake Tanganyika. 



BRAZZCEA BOURGUIGNATI Bourguignat. 



* firazzcea bourguignati BOURGUIGNAT, Un. et Ir. Tan., 1886, p. 58; '"Icon., 1888, 



pi. xxvin, figs. 5, 6. 



Lake Tanganyika. 



BRAZZCEA ELONGATA Bourguignat. 



' Hrazzcea elonyata BOURGUIGNAT, Un. et Ir. Tan., 1886, p. 51; * Icon., 1888, pi. 

 xxix, figs. 2, 3. 



Lake Tanganyika. 



BRAZZj*EA COULBOISI Bourguignat. 



* Brazzcea coulboisi BOURGUIGNAT, Un. et Ir. Tan., 1886, p. 50; *Icon., 1888, pi. 



xxix, fig. 1. 



Lake Tanganyika. 



BRAZZ^A VENTROSA Bourguignat. 



* Brazziva ventrosa BOURGUIGNAT, Un. et Ir. Tan., 1886, p. 45; * Icon., 1888, pi. 



xxix, fig. 4. 



Lake Tanganyika. 



The following are un figured species: 



Brazza'a randabeli BOURGUIGNAT, Uii. et Ir. Tan., 1886, p. 46. 

 Brazzwa moineti BOURGUIGNAT, Un. et Ir. Tan., 1886, p. 47. 

 Brazzcea jourdyi BOURGUIGNAT, Un. et Ir. Tan., 1886, p. 48. 

 Brazzcea charbonnieri BOURGUIGNAT, Un. et Ir. Tan., 1886, p. 52. 

 Brazza'a lavigerina BOURGUIGNAT, Uu. et Ir. Tan., 1886, p. 53. 

 Brazzcva bridouxi BOURGUIGNAT, Un. et Ir. Tan., 1886, p. 54. 

 Brazzcea netvcombiana BOURGUIGNAT, Un. et Ir. Tan., 1886, p. 55. 



All from Lake Tanganyika. 



Genus PLEIODON Conrad, 1834. 



(Type, Pleiodon oi-atus Swainson.) 

 Pleiodon CONRAD, .11. Ac. N. Sci. Phila., VII, 1834, p. 178. 



Shell elliptical, inflated, solid, with a rounded posterior ridge, and 

 full, smooth beaks; epidermis smooth, shining, generally rayless ; hinge 



1 Said by Bourguignat to be of Jonbert in UU. 



