24 I>HILINID.E. 



by Leuckart and Rtippell under the name of Bulla 

 smaragdina. M. Ehrenberg does not inform us whether 

 the breathing aperture formed by the folding back of the 

 lobes of the foot at the hind part of the body is persistent, 

 as in the Aplysue, or whether the lobes are laterally 

 expanded and unfolded so as to enable the animal to 

 swim through the water. 



Fam. PHILINID^E. 



Teeth, central none ; lateral one or two, large, hooked. 

 Cephalic disk, oblong or sub-quadrate, without tentacular 

 lobes ; eyes none, or, if present, sessile on the head. 

 Mantle covering and concealing the shell. Foot not 

 produced posteriorly, the sides dilated, thick and fleshy. 

 Gizzard armed with calcareous plates. 



Operculum none. 



Shell none, or internal, enclosed in the mantle ; when 

 present, loosely involute. 



This family, as at present constituted, appears to com- 

 prise a somewhat incongruous assemblage. The animals 

 have a single branchial plume, protected by the mantle, 

 and a rudimentary shell, are hermaphrodite, and their 

 gizzard is strengthened with calcareous plates. They are 

 predaceous, and swallow their prey entire, crushing the 

 shells of the Mollusks on which they feed by means of 

 their muscular gizzards. 



Genus PHILINE, Ascanias. 



Animal investing the shell. Eyes none. Foot not 

 produced posteriorly, the side-lobes large and fleshy. 



