150 



POPULAR CONCHOLOGY. 



Scutum australis. 



Small shells, easily recognised by the slit at the margin, 

 found in the European seas, also at Amboyna, the Isle 

 of France, New Holland, &c. There are three British 

 species. 



Scutum. Montf. (Parmophorus Blain.) — Shell ob- 

 long, depressed slightly, convex on the out- 

 side ; the apex small, and somewhat inclining 

 to one end ; the front side slightly hollowed 

 out; the back rounded. Animal, with the 

 foot thick, which below the mantle is sur- 

 rounded by a row of papilla? ; the mantle is 

 larger than the animal, and forms a double 

 fold at the edge, the under portion turns 

 down towards the foot, the other over the 

 shell ; the head is large, ending in a snout ; 

 the tentacula long, bearing the eyes externally at the base. 

 — 5 species ; also fossil. 



The shells of this genus are found in New Holland and 

 New Zealand under stones, the animals living upon zoo- 

 phytes and weeds: Mr. Cuming says they walk freely, 

 and are of a black hue. 



Rimula. Defrance. (Diodora Gray; Puncturella 

 Lowe; Cemoria Leach.) — Shell thin and cross-barred; a 

 hole lies between the apex and margin, not reaching the 

 latter, but in the line of an elevated rib ; in the interior a 

 groove corresponds to the hole and the elevated rib, and 

 this is partly covered with a shelly plate. Animal, with 

 a short muzzle-shaped head, bearing two subulate awl- 

 shaped tentacles, which have the eyes placed on prominent 

 bulgings, or rudimentary pedicles at their external bases ; 

 a range of cirrhi interrupted behind on each side ; mantle 

 simple-edged ; anal siphon very prominent, forming a 

 truncated membranous canal projecting from the subapical 



