266 Mr. A. Adams on new Genera and Species of 



This genus is founded on a small, turbinate, porcellanous 

 shell, which I described under the name of Isanda maculosa. 

 There is, however, a figure in Reeve's Monograph of Turbo 

 which seems to represent the same shell, and is called T. mur~ 

 reus. The nearest genus appears to be Chrysostoma of Swainson; 

 but in that the aperture is circular, and the axis is imperforate. 



Genus Ethalia, H. & A. Adams. 

 1. Ethalia perspicua, A. Adams. 

 Ann. & Mag. Nat. Hist. 1861. 

 Hab. Kino-0-Sima; Takano-Sima. 



3. Ethalia sobrina, A. Adams. 

 Ann. & Mag. Nat. Hist. 1861. 

 Hab. Akasi, 17 fathoms; Tsu-Sima, 25 fathoms. 



3. Ethalia Candida, A. Adams. 

 Annals & Mag. Nat. Hist. 1862. 

 Hab. Gotto Islands, 71 fathoms. 



4. Ethalia polita, A. Adams. 

 Ann. & Mag. Nat. Hist. 1862. 

 Hab. Gotto Islands, 71 fathoms. 



5. Ethalia omphalotropis, A. Adams. 



B. testa ovato-discoidali, alba, Isevi, nitida, semidiaphana ; spira ela- 

 tiuscula ; anfractibus 3|, convexis, rapide accrescentibus, suturis 

 impressis ; anfractu ultimo ad peripheriam rotundato ; umbilico 

 aperto, margine valde carinato ; apertura subcirculari ; labio callo 

 parvo umbilicum partim tegente. 



Hab. Yobuko, 17 fathoms. 



This species has a peculiar sharp keel surrounding the umbi- 

 licus. Like all the other examples of the genus, it is entirely 

 devoid of coloured markings. 



6. Ethalia nitida, A. Adams. 



E. testa helicoidea, tenui, semiopaca, Isevi, nitida, sordide alba ; an- 

 fractibus 2y, convexis, ultimo antice subdilatato, ad peripheriam 

 rotundato ; apertura subcirculari ; labio in medio indentato, sub- 

 calloso, peritremate in angulo postico producto. 



Hab. Yobuko, 14 fathoms. 



A thin helicoid species, with the whorls smooth and polished, 

 and the inner lip callous and indented, but not emitting a callus 

 sufficiently large to cover or conceal the umbilicus. The peri- 



