356 tornatelltd^. 



Myonia, a. AcL, 1860. 



Didr. — 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 an oblique fold. 



LEUOOTINA, A. Ad. Last whorl ventricose, minutely punctate. 

 M. Niphonensis, A. Ad. Japan. 



ToRNATELLA, Lam. 



Syn. — ActtBon,Montf. (notOken). Dactylus,Schuni. Myosota, 

 Grra}^ 



Distr. — 22 sp. Fnited States, Britain, Senegal, Red Sea, Phil- 

 ippines, Japan, Peru. Fossil, numerous. Trias to Lias — ', North 

 America, Europe, South India. T. fasciata^ Lam. (Ixxxvii, 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 Actaeon, but with the columella 

 projecting beyond the line of the anterior margin, forming a 

 small tooth-like projection, or tnincate obliquely. T. pimcto- 

 ccelaf.a, Cpr. (Ixxxvii, 28 >. California. 



soLiDULA, Fischer, 1807. (? Buccinulus, Plancus. Torna,tel- 

 Isea, Conrad.) Shell thick, columella with two plaits. A. solidula, 

 Lam. (Ixxxvii, 2Y). 



NUCLEOPSis, Conrad. Uncharacterized. A. subdivaricatus, Conr. 

 (Ixxxviii, 49). 



ACTiEONiDEA, Gabb. Oval, elongate ; aperture narrow, outer 

 lip simple, columella with one large transverse fold in the middle, 

 and truncated in advance ; surface ornamented by rcA^olving ribs. 

 A. oryza, Gabb (Ixxxviii, 50). Tertiary; W. I. Form of Cylin- 

 drites, sculpture of Actseon. 



Triptycha, Miiller, 1859. 



Distr. — T. Limnseiforviis^Mnller. 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^on, Meek. 

 Syn. — Actseonella, d'Orb. (in part). Spiractseon, Meek. 

 Example. — T. Beneauxiana, d'Orb. (Ixxxviii, 51). 



