88 AGARONTA. 



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. 

 Subgenus Agarouia, Gnu . 



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



PI. 36, fig. 26. 



Shell thin, with raised spire and large aperture, somewhat 

 dilated below ; columella'r folds very oblique ; cream-color, light 

 brown or olivaceous, frequently nebulously painted or zigzagged 

 longitudinally with brown ; the fasciole lighter or darker colored, 

 without markings; the interior va^ing 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 numerously at these two distant 

 points has much bothered conchologists ; the W.' African speci- 

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

 supposed to differ somewhat in form, have been distinguished as 

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

 shells, acknowledges that specimens from both localities vary 

 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. liiatula and fig. 65 0. testacea, Lam. 



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

 Duclos (fig. 26), 0. Steeriee, Reeve (fig. 68 >, 0. cincta, Reeve (fig. 

 70 >, a juvenile banded variety, 0. indusiaca, 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, Conrad, are so completely typical, that copies of 

 their respective figures would serve no useful purpose. 



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



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



