200 OUMA. 



knows that the names of genera in his specialty are repeated in 

 other branches of natural science, and accepted without hesita- 

 tion, and that we onl}'^ follow the " rules " by changing a dupli- 

 cated name occasionally. Besides, no one pretends to be a 

 general naturalist in these days, and the conchologist will not 

 find himself emliarrassed by the use of the generic name L'uma, 

 in any other sub-kingdom of nature, or in all of them, whilst he 

 would be " very considerably bothered " u]X)n encountering the 

 name Cymia. 



0. KiosQuiFORMis, Duclos. PI. (i2. tlgs. olS. o21, 323. 



Gray or brown externally, the revolving ribs sometimes white ; 

 chocolate-brown, sometimes disposed in many narrow revolving- 

 bands, within the aperture. Length, 1-25-2 inches. 



Panama to Mazatlan. 



Very variable in form; sometimes short and wide, with a 

 conical spire and much-developed angle on the body, in other 

 specimens with scalariform spire. In all forms the characteristic 

 is the presence of growth-laminje passing over the sutures and 

 connecting the whorls. Abundant on the rocky shores at Panama, 

 at low water. 



('. PURPUROIDES, d'Orb. (= V. FUsiKoRMis, Blaiuv.). 



This well-known species, inhabiting the West Coast of Central 

 and South America, is said to have a fusoid operculum ; it will, 

 therefore, be described and figured in Vol. Ill of this work. 

 Conchologically, the species is very closely allied to C kiosqui- 

 formis, Duclos, but may be distinguished at once by its greater 

 size and the want of frills below the sutures. 



C. CARINIFERA, Lam. PI. 62, figs. 819, 320, 324, 325, 32V. 



Shell 3^ellowish-brown or gray externally ; yellowish, some- 

 times obscurel}' baijded, within. Length, l-2.5-2'25 inches. 



Philippines, Ascension Isl., St. Helena. 



Like the preceding species, it is very variable, developing 

 more or less, either one or two revolving rows of tubercles. It 

 rejoices in eleven specific names, representing essentially difierent 

 degrees of spinous development and age. The series before me 



