106 CARYCHIID.E. 



Synonyms : Ovatella bidentata of Bivona, Auricula 

 dubia of Cantraine, A. Mitchell of Mittre, and A. Bi- 

 vona? of Philippi. My A. erosa is hardly a variety. 

 M. bidentatus of Say must take the specific name of 

 corneus given to it by Deshayes. 



2. M. myoso'tis*, Draparnaud. 



Auricula myosotis, Drap. Tabl. Moll. Fr. p. 53. Conovulus denticulatus, 

 F. & H. iv. p. 194, pi. cxxv. f. 4, 5 (as var. myosotis). 



Body whitish or pale grey, sometimes brindled, with a faint 

 tinge of purple, minutely reticulated or having a frosty appear- 

 ance ; it is slightly shagreened at the sides : mantle fleshy : 

 snout elongated, of a darker colour, and wrinkled, expanding 

 into a leaf-like lobe on each side and a rounded lobe of a 

 smaller size in front: tentacles thick, proportionally longer 

 than in M. bidentatus, somewhat flattened above, annulated 

 in the middle, tipped and streaked with purple, and scalloped 

 at the edges ; tips bulbous : eyes oblong, placed on the inner 

 base of the tentacles, a little to the rear : foot oblong, thick, 

 rather narrow, rounded at each end ; the sole is usually not 

 divided across or lobed : respiratory orifice rather small 

 [fasces cylindrical, as in Limnaea (Berkeley)]. 



Shell spindle-shaped, rather thin, almost semitransparent, 

 glossy: sculpture, minute slight and close-set longitudinal 

 strire, which are more distinct just below the suture: colour 

 rufous, chocolate, or yellowish-brown, purple towards the tip ; 

 in some specimens yellow is predominant, but often fades or 

 becomes pale : epidermis filmy, in immature specimens raised 

 into numerous delicate longitudinal ridges or folds, some of 

 which form near the top of each whorl a row or coronet of 

 hort bristles : spire mostly short, gradually tapering ; apex 

 blunt and obliquely twisted : whorls 7-8, rounded and mode- 

 rately convex, partly overlapping one another ; the last occu- 

 pies about five-eighths of the shell : suture slight but distinct, 

 nearly horizontal : mouth contracted above and expanded 

 below ; it somewhat exceeds in length the rest of the shell : 

 outer lip thin, reflected outwards, especially on the lower part 

 of the mouth ; it is strengthened within by a ridge or callosity, 

 which is often furnished with an obscure tubercle near the 



* Mouse-ear. 



