TUDICLA. 151 



Genus BUSYCON, Bolten. 



Shell pyriform, last whoii large, nodulous or spinose; 

 spire very short ; aperture large, subtriangular ; canal open, 

 elongated, entire at the fore part ; inner lip concave, with 

 a single fold anteriorly ; outer lip internally striated. 



Syn. Pyrula (part). Lam, Fulgur, Monif. 



Ex. B. perversum, Linriceus, pi. 16, fig. 2. 



Busycon has a reversed, light, ventricose shell, with a 

 single plait on the fore part of the columella, and a sul- 

 cated outer lip ; the species known are few, and come 

 from tropical regions. 



Species of Busycon. 



affine, Soiv. idoleum, Jonas. 



aruanum, Linn. Kieneri, Phil. 



canaliculatum, Linn. perversum, Linn. 

 crassicauda, Phil. 



Sub-gen. taphon, H. and A. Adams. 



Shell dextral, transversely striated, whorls rounded ; aperture 

 ovate, fore part produced into a long, slightly-recurved canal. 



striatum. Gray. 



Genus TUDICLA, Bolten. 



Shell fusiform ; spire very short, apex papillary ; aper- 

 ture oval ; canal very long and straight; columella smooth, 

 flattened, with a single fold at the fore part. 



Syn. Pyrella, Swains. Spirillus, Schlui., not Humph. 

 Spirilla, Sow., Jun. 



Ex. T. spirillus, Linnaeus, pi. 16, fig. 3. 



