560 



Body elougated, rounded. Head grooved in the middle, with 

 rounded lobes at the sides, posterior appendages very short ; eyes 

 on the upper surface of the head, small, black, and wide apart. 

 Foot with the sides folded on the back, leaving between them an 

 undulating fissure, a little sloping at the posterior part. 



Shell concealed in the interior of the back above the gills, oval, 

 entirely open, without more trace of a spire than a curved process 

 at the left border; the right border prolonged into a point slightly 

 turned on itself. 



M. Quoy observes that the Fhanerophthalmus both creeps and 

 swims, and that the shell, white, and concealed in the interior of 

 the back, above the gills, approaches more to the Dolahella.t than 

 to the BuUas. The position of the eyes at once distinguishes it 

 from CryptopUhalmus, with which it shows the greatest affinity. 



Genus 16. Sormetus, Adanson. (Animal and shell, pi. cxix. 



f. 12.) 



Caput non distiuctum. Corpus carnosum, semicylindricum, 

 lateribus valde sulcatis. 



Testa unguiformis, tenuis, pellucida, in parte posteriore disposita. 



Head not distinct. Body fleshy, semicylindi-ical, the sides 

 deeply grooved. 



Shell unguiform, tliin, transparent, covering the hind part of 

 the animal. 



Sormetus Adansonii, Blainv. 



Genus 17. Philine, Ascanias. (Animal, pi. cxix. f. 13. 

 Shell, sp. 133-139. pi. cxxv. f. 159-166.) 



Corpus ovato-elongatum, convexiusculum. Caput elongatum, 

 tentacuUs oculisque nullis. Pes lobis lateralibus, margine crassius- 

 culis, vix sursiim reflexis. 



Testa occulta, in pallio supra branchia inclusa, tenuissima, uno 

 latere partim et spiraKter convoluta, columella spiraque destituta ; 

 apertura amphssima, superne dilatato-patula. 



Body ovate-oblong, rather convex. Head elongated, without eyes 

 or tentacles. Foot with the lateral lobes slightly thickened and 

 reflected at the margin. 



Shell concealed in the mantle, thin, somewhat involute on one 

 side, destitute of distinct spire or columella; aperture large 

 and wide. 



Phylina, Lamarck. Fhyline, Gray. Lobaria, Midler. Bullcea, 

 Lamarck. Ami/dala, Plane. Pkiliue, Loveu. 



