[147] 



2. Tralia, Gray. Ovate with elevated spire ; aperture long, 



narrow, dilated in front ; inner lip 3-folded, outer lip nume- 

 rously transversely ridged within. Foot of animal acute 

 and entire behind. 



3. Leuconia, Gray. Shell ovate-oblong, spire conical, aperture 



elongate, oval ; inner lip with two anterior plaits, outer lip 

 internally smooth, its margin acute. Foot divided infe- 

 riorly by a transverse groove. 



4. Pedipes, Adanson. Subglobose, imperforate, transversely 



striate, spire short ; aperture narrow ; parietal wall concave, 

 with three plaits, of which the posterior is largest ; outer 

 lip with a sinus behind, two internal teeth, and an acute 

 margin. Foot divided below by a transverse groove. 



5. Blauneria, Shuttleworth. Ovate-oblong, thin ; aperture 



long and narrow, the inner wall plicate near the columella, 

 columella subtruncate ; lip simple, acute. 



MELAMPUS, Montfort. 

 1. Melampus olivaceus, Carpenter. 



Plate 18, figure 4. 



Obeonic; spire short, suture indistinct ; whorls 7-9, obtusely 

 angulated on the body below the suture ; aperture long and 

 narrow, lip covered with sharp laminae within, parietal wall with 

 from one to three small revolving laminae ; there is also a stout 

 fold on the columella. Epidermis olivaceous, below which the 

 color is white with patches or revolving lines' of red. 



Length 13, diam. 8 mill. 



Lower California, Mazatlan. 



2. Melampus bidentatus. Say. 



Plate 18, figure .5. 



Obovate, epidermis longitudinally wrinkled, with very minute 

 revolving striae ; spire short, obtuse, suture distinct ; whorls 6, 



