PLnioDON 1379 



Iridina spekii Ci.essin, Conch. Cab. Ano., 1875, p. 232, pi. lxx, 



fig. 2. 

 Pleiodon (Cameronia) spekii Crosse, [1. de Conch., XXIX, 



1881, p. 130. 

 Pleiodon spekii Smith, Proc. Zool. Soc, 1881, p. 296, pi. 



XXXIV, figs. 31, 31a. — Simpson, Syn., 1900, p. 909. 

 Mntela (Iridina) spekii von Martuns, Besch., 1897, p. 256. 

 Pliodon (Cameronia) spekei Germain, Moll. L. Tan., 1908 



p. 83. 

 Pliodon spekei Germain, Arch. Zool. Exp. et Gen., (5), I 



1909, p. 59. 

 Cameronia gigantea Bourguignat, Un. and Ir., 1886, p. 68 



Icon. Mai, 1888, pi. xxxv, fig. i. 

 Cameronia admirabiUs Bourguignat, Un. and Ir., 1886, p. 69 



Icon. xMal., 1888, pi. xxxiv, fig. i. 

 Cameronia coulboisi Bourguignat, Un. and Ir., 1886, p. yy 



Icon. Mai, 1888, pi xxxr, figs, i, 2. 

 Cameronia josseti Bourguignat, Un. and Ir., 1886, p. 82 



Icon. Mai, 1888, pi xxxii, fig. 3. 

 Cameronia paradoxa Bourguignat, Un. and Ir., 1886, p. 91 



Icon. Mai, 1888, pi xxxii, fig. i. 

 Cameronia hridoiixi Bourguignat, Un. and Ir., 1886, p. 71. 

 Pliodon (Cameronia) hridouxi Germain, Moll. L. Tan., 1908, 



p. 84, figs. 43, 44. 



All the specimens of Cameronia I have seen seem to be more 

 or less diseased and therefore quite variable in form. The 

 group has apparently furnished Bourguignat with a capital 

 opportunity to found a great number of so-called species on 

 every possible trivial variation and deformity. 



Pleiodon landeaui T Bourguignat). 



Shell subelliptical or subrhomboid, not much elongated, 

 somewhat inflated, solid, slightly inequilateral; beaks high, 

 long and full ; dorsal outline arched, most produced at the 

 beaks ; anterior end narrowed, rounded, angled above ; base 

 line curved ; posterior end obliquely truncate above, rounded 

 IdcIow ; surface concentricalh'- striate ; margins dark chestnut ; 

 beaks greenish, the rest of the shell yellowish-chestnut ; nacre 



