356 TORNATELLIDA. 
Myonia. A: Ad., 1860. 
Distr.—M. Japonica, A. Ad. Japan. 
Shell ovate, turreted ; white, thin, with slightly convex, spirally 
sulcated whorls; aperture oblong, a little produced anteriorly ; 
inner lip with au oblique fold. 
LEUCOTINA, A. Ad. Last whorl ventricose, minutely punctate. 
M. Niphonensis, A. Ad. Japan. 
TORNATELLA, Lam. 
Syn.—Actieon, Montf. (not Oken). Dactylus,Schum. Myosota, 
Gray. 
Distr.—22 sp. United States, Britain, Senegal, Red Sea, Phil- 
ippines, Japan, Peru. Fossil,numerous. Trias to Lias— , North 
America, Europe, South India. 7. fasciata, Lam. (1xxxvii, 26). 
Shell solid, ovate, with a conical, many-whorled spire, spirally 
grooved or punctate-striate ; aperture long, narrow, rounded in 
front; outer lip sharp; columella with a strong, tortuous fold. 
Operculum horny, elliptical, lamellar. 
Animal white; head truncated and slightly notched in front, 
furnished posteriorly with recumbent tentacular lobes, and small 
eyes near their inner bases; foot oblong, lateral lobes slightly 
reflected on the shell. Lingual teeth 12:12, similar, with long 
simple hooks. 
RICTAXIS, Dall. Shell like Actwon, but with the columella 
projecting beyond the line of the anterior margin, forming a 
small tooth-like projection, or truncate obliquely. 7. puncto- 
celata, Cpr. (Ixxxvii, 28 . California. 
SOLIDULA, Fischer, 1807. (? Buccinulus, Plancus. Tornatel- 
lea, Conrad.) Shell thick, columella with two plaits. A. solidula, 
Lam. (1xxxvii, 27). 
NUCLEOPsIs, Conrad. Uncharacterized. A. subdivaricatus, Conr. 
(Ixxxviii, 49). 
ACTHONIDEA, Gabb. ‘Oval, elongate; aperture narrow, outer 
lip simple, columella with one large transverse fold in the middle, 
and truncated in advance ; surface ornamented by revolving ribs. 
A, oryza, Gabb (Ixxxviii, 50). Tertiary; W.I. i‘orm of Cylin- 
drites, sculpture of Actzon. . 
TriprycHa, Muller, 1859. 
Distr — T. Limnxiformis, Muller. Cret.; Europe. 
Ovate, almost perfectly smooth, aperture rounded anteriorly, 
outer lip sharp, inner lip with three folds, of which the middle 
one is largest. Only one fossil species; perhaps a Marinula. 

TrocHact£o0n, Meek. 
Syn.—Acteonella, d’Orb. \in part). Spiracteeon, Meek. 
Euample.—T. Reneauxiana, Orb. (Ixxxviil, 51).° 
