MACROCERAMUS, 219 



locality the shell was received, but from the fact of Dr. Binney 

 describing in his work no shells but what he knew to exist in the 

 United States, I am inclined to believe he received it from Florida. 

 His collector would be more likely to furnish him with a living 

 specimen from that point, than he to receive it from some Mexican 

 or South American locality. I do not know to which species it 

 may be referred, but presume it to be B. undatus. He thus 

 describes it : — 



The most beautiful form of the species is that figured in plate liv, a. 

 It is quite thick and ponderous ; its general color is deep brownish, varie- 

 gated with undulating intervals of white on the spire, and others more 

 obscure on the columellar side of the body-whirl. On the side opposite 

 to the aperture, the brown color is relieved only by three indistinct and 

 ill-defined dark bands, and by the black line showing the margin of a 

 former peristome. The columella is considerably thickened and folded ; 

 and the columellar margin is covered by a black callus ; and the peri- 

 stome is broadly margined internally with black ; further in, the aperture 

 is purely white. 



Mr. Say no doubt referred to 0. imdatus under the name of 

 Achatina Jlammigera, Fer. (ed. Binney, p. 29). He mentions also 

 the manuscript name of reaes, which he had intended to give to 

 a shell found on trees at the southern extremity of east Florida, 

 but which he afterwards found to be Bulimus undatus, Brug. 



Kafinesque's description of Agatina fuscota will be found on 

 p. 50 of Terr. Moll. I. The locality (Louisiana) is doubtful. 



MACROCERAMUS, GriLD. 



Shell turreted or lengthened-conic, riraate; whirls 9-15, gradu- 

 ally increasing, the last often angular; aperture round, short, 

 columella usually plicate ; peristome expanded, its margins sub- 

 equal, subparallel, not continuous, the external arched, the colu- 

 mellar dilated, reflected. 



Jaw (of 3L signatus^) very strongly arched, composed of 



' Bland, Ann. N. Y. Lye. VIII, 162, f. 5, 6 (18G5). 



