88 AGARONIA. 



0. Orbignyi, Marrat. PI. 34, fig. 59, 



Purple-brown, with two narrow revolving white bands below 



the middle ; interior of aperture orange-red. Length, '9 inch. 



Patagonia, 

 Siibginus Agarouia, Gra' . 



O. HIATULA, Gmelin. PI. 34, figs. 60-67; PI. 35, figs. 68-70; 



PL 36, fig. 26. 



Shell thin, with raised spire and large aperture, somewhat 



dilated below ; colunirellar folds vei'y obliqne ; cream-color, light 



brown or olivaceous, frequently nebulously painted or zigzagged 



longitudinally with brown ; the fasciole lighter or darker colored, 



without markings; the interior var^ang from cream-color to 



chocolate, sometimes showing the external markings. 



Length, 1 •5-2-5 inches. 



West Coast of Africa; Panama to Mazatlan. 



The occurrence of this species numerousl}^ at these two distant 

 points has much bothered conchologists ; the W, African speci- 

 mens were called 0. Jiiatula, and the W, American specimens, 

 supposed to diflfer somewhat in form, have been distinguished as 

 0, lestacea, Lam. P. P. Carpenter, in his monograph of Mazatlan 

 shells, acknowledges that specimens from both localities varj^ 

 considerably in form and are in this respect indistinguishable, 

 but he attempts to make differential characters in the coloring 

 of the fasciole, and tinting of the plications; in both which 

 respects specimens before me, with undoubtedly correct habitats, 

 completely contravene his assertions ; indeed I have Mazatlan 

 specimens, received from Carpenter himself, which fully exhibit 

 the features which he believes to be peculiar to the W. African 

 form, whilst Gambian specimens show the W. American colorings. 

 Figs, 60-63 show 0. hiatula and fig. 65 0. lestacea, Lam, 



Other synonyms are: 0. pallida^ Swains, (fig, 64), 0. nitellina, 

 Duclos (fig. 26), 0. Steerise, Reeve (fig, 68 ', 0. cincta^ Reeve (fig, 

 70', a juvenile banded variety, 0. indufiiaca, Reeve (fig, 66), 

 erroneously said to inhabit the mouth of the River Indus, and 

 0, Ancillarioides, Reeve (fig. 69), 0. Lamarckii, Swainson, and 

 0. propatula^i Conrad, are so completely typical, that copies of 

 their respective figures would serve no useful purpose. 



0. ACUMINATA, Lam, PI, 35, figs. 71-80 ; PI. 1, fig. 4. 



Yellowish, fawn, or ash-gray, irregularly marked with zigzags 



