No.i205. SYNOPSIS OF THE NAIADES— SIMPSOJS'. 909 



* Pleiodon letourneauxianus Bourguignat, Moll. Egypt and Ab., 1879, p. 48. 



Senegal River. 

 '' Pleiodon 2>achyodon Bourguignat, Moll. Egypt and Ab., 1879, p. 43. 



Subgenus CAMERONIA Bourguignat, 1879. 

 (Type, Iridina spekii Woodward.) 



Anterior end of the hinge plate usually (not always) split up length- 

 wise into irregular teeth, which bear tubercles on their surfaces.^ 

 The mantle of P. spehii has a decided palleal sinus behind. (Pelseneer.) 



t PLEIODON SPEKII Woodward. 



* Iridina {Pleiodon) spekii Woodward, Pr. Zool. Soc. Loud., 1859, p. 348, pi. xlvii, 



fig. 2 ; * Ann. and Mag., V, 1860, p. 337. 



* Pleiodon spekii Sowerby, Conch. Icon., XVI, 1866, pi. i, fig. 2. 



* Platiris {Iridina) spekii Lea, Syn., 1870, p. 88. 



* Cameronia spekii Bourguignat, Moll. Egypt and Ab., 1879, p. 43. 



* Iridina spekii Clessin, Couch. Cab. Anc, 1875, p. 232, pi. lxx, fig. 2. 



* Pleiodon (Cameronia) spekii Crosse, Jl. de Conch, XXIX, 1881, p. 130. 



* Pleiodon spekii Smith, Proc. Zool. Soc, 1881, p. 296, pi. xxxiv, figs. 31, 31a. — 



* PyETEL, Conch. Sam., Ill, 1890, p. 188. 



* Mutela {Iridina) spekii von Martens, Besch., 1897, p. 256. 



* Cameronia glgantea Bourguignat, Un. et Ir. Tan., 1886, p. 68; * Icon. Mai., 



1888, pi. XXXV, fig. 1. 

 *CameroKi« a(?mi;'a6iWs Bourguignat, Un. et Ir. Tan., 1886, p. 69; *Icon. Mai., 



1888, pi. XXXIV, fig. 1. 

 "" Cameronia coulboisi Bourguignat, Un. et Ir. Tan., 1886, p. 77; * Icon. Mai., 



1888, pi. XXXI, figs. 1, 2. 

 Camej-omia^'osseii Bourguignat, Un. et Ir. Tan., 1886, p. 82; "Icon. Mai., 1888, 



pi. XXXII, fig. 3. 



* Cameronia paradoxa Bourguignat, Un. et Ir. Tan., 1886, p. ^91; *Icon. Mai., 

 ?, pi. XXXII, fig. 1. 



Lake Tanganyika. 



PLEIODON LANDEAUI Bourguignat. 



* Cameronia landeaui Bourguignat, Un. et Ir. Tan., 1886, p. 74; "Icon. Mai., 



1888, pi. XXXI, fig. 3.2 



Lake Tanganyika. 



PLEIODON BOURGUIGNATI Bourguignat.s 



* Cameronia hourguignati Bourguignat, Esp. Ouk., 1885, p. 26 ; * Icon. Mai., 1888, 



pi. XXXIII. 



Lake Tanganyika. 



The following are unfigured species of Cameronia. 



* Cameronia anceyi Bourguignat, Esp. Ouk., 1885, p. 30. Lake Tanganyika. 



* Cameronia hridouxi Bourgx^ignat, Un. et Ir. Tan., 1886, p. 71. 



* Cameronia cliarhonnieri Bourguignat, Un. et Ir. Tan., 1886, p. 83. Lake 



Tanganyika. 



'The splitting up of the anterior end of the hinge is altogether irregular, and 

 may be due to disease, as the hinge is sometimes entire, 

 2 Probably a short, diseased spekii. 

 ^Credited to Ancey in litt. by Bourguignat, 



