the Genus Planaxis. ;^9 



This species has much of the general appearance of P. 

 sulcata; but the difference of colour and style of painting 

 may be sufficient to separate it. 



4. Planaxis crassispira. B.M. 



P. testa perelongato-ovata ; spira crassa ; anfr. 6, planiusculi, spira- 

 liter valide costati ; costae planae, albae, nigro-brunneo punctatae, 

 in anfr. ultimo 16 ; interstitia luteola; in anfr. ult. zonae 2 pur- 

 purascentes, superior nigro-maculata, altera supra et altera infra 

 peripheriam albam ; apertura perparva ; labrum intus fuseum, 

 medio albo-maculatum, margiue tenui et crenulato, subito incras- 

 satum et intus 9-liratum ; columella curvata et callo postico 

 munita. 



Long, 18 mill., diam. 8|. 



Hah. ? 



The breadth of the upper whorls is very marked compared 

 with that of other species. The aperture also is conspicu- 

 ously small. 



5. Planaxis hrevis. 

 Planaxis brevis, Quoy, Voy. Astrolabe, vol. ii. p. 488, pi. 33. figs. 30-32. 

 Hab. Guam and New Guinea. 



6. Planaxis hreviculus. B.M. 



Planaxis breviculus, Desh. Mag. de Zool. 1844, pi. 108 ; Issel, Mem. 

 Accad. Torin. xxiii. pi. 1. figs, o & 6. 



Hal. ? Var. Persian Gulf {Col Pelly). 



The British-Museum collection contains a very dark bluish- 

 black variety from the Persian Gulf, covered with an olive- 

 brown epidermis. The lir^e within the mouth are very line 

 indeed. The young form of this variety approaches P. Men- 

 keanus^ Dkr. 



7. Planaxis Menkeanus. 

 Planaxis Menkeanus, Dunker, Malak. Blatt. 1861, p. 41. 

 Hab. Red Sea. 



8. Planaxis jjlanicostatus. B.M. 



Planaxis planicostata, Sowerby, Append. TankerviUe Cat. p. 13, 1825 ; 



Reeve, Element. Conch, pi. B. fig. 17. 

 Bnccinum planaxis, Wood, Index Test. Suppl. p. 12, pi. 4. fig. 15 a-, 



1828. 

 Planaxis canaliculata, Duval, E,ev. Zool. 1840, p. 107. 

 circinata, Lesson, Rev. Zool. 1842, p. 187. 



Hah. Galapagos Islands and Panama. 



