PTYCHATRAOTUS. 



Mr. Stearns has added a second species, which may not be dis- 

 tinct ; and I place here (because I must place it somewhere) the 

 Fusus Coreanicus of Mr. E. A. Smith. 



Genus PTYCHATRACTTTS, Stimpson. 



P. LIGATUS, Mighels and Adams. PL 40, fig. 185. 



Shell light reddish brown. Length, *t5 inch. 



Coasts of Maine, Nova Scotia ; Gulf of St. Lawrence ; 



in deep water. 

 Operculum like that of Fusus. 



P. OCCTDENTALIS, Stearns. 



Shell elongated, fusiform, rather slender, whitish, traversed by 

 narrow, revolving, brownish threads and much wider intervening 

 spaces ; suture distinct, spire tapering ; aperture oblong-oval, 

 about half the length of the shell ; within white, polished ; canal 

 short, nearly straight ; columella obliquely, not strongly plicated. 



Length, -15 inch. 



Isle of Nagai, one of the Shumagin Islands. Forty fathoms. 



More delicate than the Atlantic species, although the single 

 specimen was not quite mature. This specimen having been 

 mislaid, Mr. Stearns has not yet figured it. It must be con- 

 sidered a doubtful species for the present, as the description 

 presents no features by which the shell can be positively dis- 

 tinguished. 



P. COREANICUS, E. A. Smith. PL 40, fig. 186. 



Whorls slightly longitudinally costate and encircled by about 

 twelve revolving ridges, which are alternately smaller. Dirty, 

 diluted flesh-color, the ribs stained with dark brown ; fuscous 

 within the aperture. Columella smooth, arcuate above, very 

 oblique inferiorly ; canal short, slightly retro verted. 



Length, 22 mill. 



Japan. 



The evanescent ribs are sometimes indicated very obscurely 

 on P. ligatus. Nothing is said about columellar folds, but these 

 are sometimes not apparent on P. ligatus. The general form of 

 the shell is so nearly that of Ptychatractus, that I do not know 

 where else to place it with equal probability of giving it its 

 correct position. 



