^Bdker — Critical Notes on the Muricidae. 387 



gyratory scars so characteristic of that genus. The nucleus is 

 situated within the edoje of the operculum, midway between 

 the ends. Hanetia Jouss., 1880 (type Urosalpinx Haneti 

 Petit) is a synonym. 



It may not be out of place here to mention the American 

 species of the genus, since they are pretty badly mixed in 

 most cabiuets. 



U. ciNEREUS Say. Massachusetts to Florida. 



U. TAMPAENsis Courad. West Coast of Florida. (This 

 species is usually classed as a Eupleura.) 



U. PERRUQATUS Conrad. Cedar Keys, Key West to West 

 Florida. (See Proc. Phil. Acad. Sci., pp. 46-47, 1890.) 



U. CAROLINENSI8 Verrill,') 



voff Cape Hatteras, 120-938 fms. 

 U. MACRA Verrill, ) 



(See A. E. Verrill, Trans. Conn. Acad., VI, pp. 237-239.) 



Genus Liacliesis Eisso. 



This genus, formerly included in Pleurotomidae, is now 

 placed by Fischer in the Muricidae (vide Man. de Conch.). 

 The characters are said to be entirely muricoid, thus the 

 change. The type species, Lachesis minima Mont., is 

 from European seas. Its relationships are somewhat 

 doubtful. 



Subfamily PURPURINAE. 



Genus Purpura Brug. 



Subgenus Thalessa H. & A. Adams. 



Purpura armigera Cheran. 



Purpura armigera Chemn., Conch. Cab., XI, pi. 187, flg. 1798. 



Purpura affinis Reeve (Conch. Icon., sp. 77, 1846) may be 

 considared a good variety of armigera; it is always a much 

 slenderer form, with the spines less numerous; it is also a 

 smaller species, ranging from 37 to 65 mill, in length. 



