56 Mr. W. Clark on the lanthinse, Scalarise, 



Lamellaria tentaculata, Montagu. 



Though the ' British Mollusca ' quotes me for this species, I 

 now believe that it and the preceding are identical. In the 

 great numbers I have examined during the last forty years, I 

 have never seen one of them with such decided long, filiform, 

 sharp-pointed tentacula as to distinguish it as a species ; I think 

 we may safely conclude that Montagues animal is the L. per- 

 spicua. 



Velutina, Gray. 

 Velutina has a single British species ; it has been thought to 

 have close connexion with Sigaretus, on which point see the 

 remarks under the title of Natica : in addition it may be stated, 

 that Velutina has eyes, but no operculum ; Sigaretus is the re- 

 verse, and whatever it may prove when more investigated, we 

 will for the present consider Velutina a good geniis of the muri- 

 cidal type, and I consign it to the Peloridce. 



Velutina laevigata, auct. 

 Helix Icevigata, Mont. 

 Animal suborbicular, inhabiting a brown auriform shell with 

 a coarsely striated thick epidermis. The mantle is extremely 

 large, fleshy, with two emarginations, one branchial on the left 

 side of the centre of the shell, the other is an anal conduit ; it is 

 marked in all directions with fine intense flake-white anastomo- 

 sing lines ; the inflations and thick lobules of the margin can 

 scarcely be maintained within the periphery of the aperture. 

 The head is of muricidal stamp, being a small, flat, almost united 

 membrane, under which is the mouth, a mere subvertical fissure, 

 from which the animal can exsert a long cylindrical proboscis 

 annulated by fine flake-white lines, and has within the orifice a 

 small white palate, supported by two oval yellowish-brown stri- 

 ated corneous plates, between which is a very short white spiny 

 tongue, which is quite anterior, not x%ths of an inch long. The 

 tentacula are short, white, not very pointed, and spring from the 

 head-veil, with eyes on slightly raised eminences at the external 

 bases. The foot is rather long and wide, and when extended 

 truncate anteriorly, with inconsiderable auricles, and these in 

 full action disappear; it then tapers to a blunt temiinus. The 

 branchial apparatus consists of two plumes, lying on the left side 

 of the neck ; the one a. pale brown riband of numerous strong 

 strise or vessels, the other is a small dark striated leaf with an 

 apparent division in the centre caused by the arterial vein ; it is 

 placed close under the larger mass. The heart and auricle are 

 at the base of the larger leaf; perhaps the greater range may be 

 the mucous fillets common to most or all the Muricidce, but from 



