VELUTINA. 349 



fills a large proportion of the ventral area ; it is entirely 

 devoid of sculpture, but the muscular scars are decidedly 

 conspicuous. The outer lip is acute, simple, and a little 

 disposed to expand ; it springs out horizontally, or else 

 rises a little at its commencement, and arching out with a 

 continuous semicircular sweep, is imperceptibly united to 

 the pillar lip, which last is extremely narrow and not 

 appressly reflected, but almost erect. A very slight coat- 

 ing of shelly matter (usually white or liver-coloured) is 

 spread over the scarcely convex upper extremity of the 

 inner lip ; this area is very short in proportion to the 

 pillar lip, which latter, and likewise the outer lip, recede 

 considerably towards the anterior extremity of the aper- 

 ture. On the removal of the epidermis, the inner lip is 

 usually seen to be slightly severed from the body-whorl, 

 so as sometimes to look like an umbiHcal chink ; but 

 there is no real axial perforation. Fine examples will 

 occasionally measure almost three quarters of an inch in 

 length, and nearly an inch across at the broadest part ; but 

 such dimensions are by no means common. 



The young may be readily distinguished from the adult 

 Otina by their pallid hue, more orbicular shape, broader 

 spire, and narrow pillar lip. 



The animal is entirely white ; the mantle has a tumid 

 border which is slightly reflected upon the shell. The 

 head is short and tumid, and contains a rather short 

 retractile proboscis. It is flanked by two long subulate 

 rather thick tentacles, set widely apart and bearing rather 

 small eyes placed on bulgings at their external bases. 

 The foot is steep- sided, rather long, obsoletely truncated 

 and angulatcd in front, rounded behind, and presenting 

 neither operculum above, nor medial groove below. The 

 liver is large and red. The axile tooth of the tongue 



