SCAPHANDER. I 9 



Genus SCAPHANDER, Montfort. 



Animal not investing the shell. Eyes none. Foot 

 ample, but short, the side-lobes small. 



Shell ovato-pyriform, convolute ; spire distinct, de- 

 pressed, somewhat concealed ; aperture very wide, nar- 

 rowed behind, entire and dilated in front ; inner lip 

 spirally convoluted as far as the commencement of the 

 spire ; outer lip simple, acute. 



Si/n. Assula, Schum. Bull sea, Roissy, not Lam. 

 Bulla, Swains., not Klein. 



Ex. S. lignarius, Linn&us, pi. 57, fig. 4. Shell, S. 

 lignarius, fig. 4, a. 



The gizzard of Scaphander is armed with three calca- 

 reous plates, two of which are large, flat and sub-circular, 

 and the third is much smaller. Gioe'ni, an Italian Natur- 

 alist, made out of this gizzard an imaginary genus of 

 Mollusks, which he named Gioenia after himself, and 

 even went so far as to describe the habits of the fictitious 

 animal. The supposed genus, also named Tricla by 

 Retzius, was adopted by Lamarck and by Cuvier, the 

 latter of whom regarded it as a sub-genus of Pholas ; the 

 imposition, however, was detected and exposed by the 

 illustrious Draparnaud, who first proved the real nature of 

 the imaginary creature. 



Species of Scaphander. 



librarius, Loven. puncto-striatus, Migh . 



lignarius, Linn. scaber, 0. Mutt. 



lineolatus, Couth. vestitus, Phil. 



