219 



cately twisted ; lip acute, thickened within ; color light olive, 

 alternating with slightly undulating chestnut lines and bands, 

 rarely marked by transverse black fascise ; columella and aper- 

 ture white. 



3. A. NIGRA. A. testa dextrorsa, globosa, acuminata, sub- 

 solidti; anfr. 6, inferioribus inflatis, superioribus subulatis, duo- 

 rum supremorum superficie striis longitudinalibus et liris irregu- 

 laribus volventibus in cicatrices rudes designata ; suturti simplici 

 bene impressa ; apertura rotundato-ovata ; columella brevi, in 

 dentem lamellarem terminante ; colore flavo albido ; epidermide 

 tenui nigro. Long. ^^ poll. ; lat. ^^ poll. Hah. E. Maui. 



Shell dextral globosely, acuminate, rather solid ; the two lower 

 whorls inflated, the superior ones subulate ; whorls six, the last 

 two cut up on the surface into rude cicatrices by longitudinal 

 striae crossed by revolving elevations, irregularly distributed ; 

 superior whorls flattened, with closely crowded strong longitu- 

 dinal striae ; suture simple, well impressed ; aperture, round 

 ovate ; columella short, terminating in a lamellar tooth ; color 

 yellowish white, with a thin black epidermis. 



4. A. TETRAO. A. testa sinistrorsa, acuto-conica, infra inflata; 

 anfr. 6, rotund is ; sutura profunda; apertura sub-ovata ; colum- 

 ella brevi, late plicata ; colore albo, epidermide tenui cum undis 

 nigris vel fuscis obtecto ; vilta suturali lata carminea ; apertura 

 intus alba ; columella et regione vicina rubra vel aurantiaca. 

 Long. i§ ; lat. ^^ poll. Hab. Ranai. 



Shell sinistral, acutely conical, pointed at the summit, inflated 

 below ; whorls six, rounded ; suture deep ; aperture sub-ovate ; 

 columella short, and broadly plicate ; color white, covered by a 

 thin epidermis, with black or brown undulations, often so dense 

 as to cover most of the shell ; a broad sutural carmine band is a 

 constant character ; aperture within, white ; columella and adjoin- 

 ing portion of the base of the shell, pink or orange. 



This shell has been confounded with A. picta^ Mighels, from 

 Maine, by my European correspondents. In addition to the 

 presumptive evidence afforded by a difl^erence in habitat, the 

 measurements constantly diflfer, the adult picta giving J§ by /^j 



