40 Mr. E. A. Smith oti Species of 



9. Planaxis ohscurus. B.M. 

 Planaxis obscura, A. Adams, Proc. Zool. Soc. 1851, p. 271. 



Hab. ? 



It is a question whether this species should not be placed 

 as a variety of P. planicostatus ; but it would be hazardous to 

 do so until more specimens are at hand and the locality- 

 known. The chief difference consists in the narrowness of 

 the sulci, and the mouth being of a uniform brown colour. 

 The epidermis is similar. 



10. Planaxis nucleus. B.M. 



Purpura nucleus, Lamarck, Anim. s. Vert. vol. vii. p. 249, ed. 2, vol. x. 



p. 88. 

 Planaxis semisulcata, Sowerby, Gen. Rec. & Foss. Shells, pi. 70. fig. .3. 



Hab. West Indies, Jamaica. 



11. Planaxis nicobaricus. 



Planaxis nicobaricus, Zelebor, Verhandl. zool.-bot. GeseUsch. Wien, 

 1866, vol. xvi. p. 910; Frauenfeld, ReiseNovara, MoUusk. p. 9, pi. 2. 

 fig. 12. 



Hab. Nicobar Islands. 



12. Planaxis nigritellus. B.M. 



Planaxis nigritella, Forbes, Proc. Zool. Soc. 1850, Dec. p. 273, pi. 11. 

 fig. 6. 



actttus, Menke, Zeitscbrift f. Mai. Nov. 1850, p. 169. 



obsoletus, Menke, /. c. p. 170. 



Hab. Mazatlan. 



The name acutus was employed by Krauss for a Cape 

 species two years previous to Menke. This, together with 

 the reasons given by P. P. Carpenter in the ' Mazatlan Cata- 

 logue,' p. 364, are sufficient to establish the retention of 

 Forbes's species. 



13, Planaxis acutus. B.M. 



Planaxis acuta, Krauss, Siidafrik. Moll. p. 103, t. 6. fig. 2. 

 Hab. Natal. 



14, Planaxis castaneus. B.M. 



P. testa solida, elongato-conica, castanea ; spira elongata, apice acu- 

 minato ; anfr. 6, convexiusctili, spiraliter striati (in anfr. ultimo 

 striae circiter 20, basi validissimae), incrementi lineis obliquis 

 parum conspicuis ; apertura parva, ovata, spiram non sequans, 

 intus pallide fusca; labrum margine tenui, subito incrassatum, 



