256 SMITH : ON THE GENUS SCUTUS. 



of the living creatures. Besides the black pigment which stains 

 the mantle and foot of this genus is easily removed and a white 

 tissue beneath presents itself How much of this coloring may 

 have been removed in the above-mentioned examples we do not 

 know, and it is quite possible that when living all may have had 

 a completely sombre exterior. 



A LIST OF THE DESCRIBED SPECIES. 



1764 — unguis L. (Pafe//a) = Scutus unguis. 



1795 — ambiguus Chem. {Fatelia) = S. ambiguus. 



1810 — antipodes Montfort {Sadus)= S. ambiguus. 



1817 — elongatus Blain. {Parmophonis)^^, anatinus. 



1817 — breviculus Blain. {PaiinopIiorus)=^S. ambiguus. 



1817 — granulatus Blain. {PannopJiorus)^S. unguis. 



1820 — anatinus Donovan {Fafella)^S. anatinus. 



1822 — australis Lam. {Par;nophoriis)=S. anatinus. 



1825 — elegans Gray {Par)!iopho?us) = S. unguis. 



1834 — convexus Quoy& Gaim. {Pa)-mophorus)=^S. anatinus. 



1834 — imbricatus Quoy & Gaim. {Parmop/ionis)^S. unguis. 



1842 — corrugatus Reeve {Parmophoriis)^=S. unguis. 



1851— angustatus A. Ad. {Sci/tus)=S. unguis. 



1 85 1 — Ruppeli Phil. {Pa/-mopIwrus)=S. unguis. 



1 85 1 — emarginatus Phil. {Parmophom s)=S. unguis. 



Species known to me only by brief descriptions : — 

 1825 — fissurella Blain. {Panuophorus). 

 1825 — sinensis Blain. {Parmophonts). 

 1825 — fragilis Blain. {Parmophoj-us). 

 1837 — gibboSUS Anton lyParmophorus). 



J.C., ii., August, 1S79 



