GONIOBASIS. 



217 



The figure is a copy of that in Mr. Conrad's work. It is 

 evident!}' a verj^ poor one, however. It is probable this will 

 prove to be identical with Mr. Anthony's T. cristata. 



Fig. 433. Fig. 434. 



103, G. cristata, Anthony. 



Melania cristata. Axtiioxy, Ann. Lye. Nat. Hist. N. Y., vi, p. 108, t. 3, f. 8, March, 

 lS.")i. BixxEY, Check List, No. 77. Brot, List, p. 32. REEVE, Monog. Mela- 

 nia, spj 413. 



Description. — Shell cariuate on the body-whorl, rhomboidal ; thin, 

 horn-colored ; upper whorls not carinate, but some- 

 what shouldered ; whorls five, flat, slightly concave, 

 diminishing rapidly to the apex; sutures not re- 

 markable ; body-whorl with a 

 strong, well developed carina, 

 extending from the upper part 

 of the aperture, and revolving round so as to be 

 at its centre when it reaches the mouth again. 

 The carina and a smaller one below it are indi- 

 cated in the interior by a grooved channel with 

 a dark band running through it; aperture rhomboidal, bauded vpithin; 

 columella straight, with an acute sinus at base. 

 Habitat. — Alabama. 



Diameter, -34 (9 millim.) ; length, -50 of an inch (13 millim.). 

 Length of aperture, -30 (8 millim.); breadth of aperture, "IG of au 

 inch (4 millim.) 



Observations. — Only one specimen of this remarkable species has 

 come under my notice, but it is so widely diflerent from all others 

 that no one can for a moment doubt its distinctive character. The 

 upper whorls are obscurely banded near the suture. — Anthony. 



Tig. 434 is from the tj-pe specimen. It is not an adult, 

 and is also a malformation. The succeeding figures represent 

 dilferent varieties and ages. The carination appears to be 

 lost in an obscure angle on the periphery of the adult shell. 



