MOLLUSCA. 809 



Mitra LAM. Shell mostly fusiform, with apex acute. Folds 

 of columella suboblique, transverse, decreasing forwards. Aper- 

 ture narrow, broader anteriorly, terminated by a deep oblique sinus 

 ascending upwards. Animal with tentacles oculiferous externally at 

 the sides or at base ; exsert proboscis surpassing the shell in length. 



a) With spire elongate. 



Sp. Mitra episcopates LAM., Valuta mitra L. (in part), EUMPH. Amb. Rari- 

 teitk. Tab. 29, fig. K, D'ARGENVILLE Conchyl PL 9, fig. c, BLAINV. 

 Malacol. PL 28 bis, fig. i, KIENEB Coq. viv., Columellaires, Mitre, PL I. 

 fig. i (fig. with the animal) ; Mitra vulpecula LAM., Valuta Vulpecula L., 

 GUERIN Iconogr., Moll. PL 17, fig. i. 



b) With spire shorter. (Habitus nearly of Conus.) Conohelix SWAINS., 

 SOWEEBY, Imbricaria SCHUMACHER. 



Sp. Mitra dactylus LAM., Valuta Dactylus L., BLAINV. Malacol. PL 28 bis, 

 fig. 3, GUERIN Iconogr., Mott. PL 17, fig. 2. 



Marginella LAM. (with addit. of several spec, of Vblvaria ejusd.). 

 Shell ovato-oblong, smooth, with short spire. Aperture scarcely 

 sinuate. Columella with folds transverse, oblique, subequal. La- 

 brum incrassated externally. 



Sp. Marginella faba, Valuta Faba L., Encycl. meth., Vers. PL 377, fig. r, 

 BLAINV. Malac. PL 30, fig. 5, &c. 



Terebellum LAM. Shell convolute, subcylindrical, with apex 

 acute. Aperture longitudinal, narrow, broader towards the end, 

 terminated by sinus. Columellar margin produced with apex 

 truncated beyond labrum. (Animal with tentacles filiform, oculife- 

 rous at the point.) 



Sp. Terebellum subulatum, Bulla terebellum L., HUMPH. Amb. Rariteitk. Tab. 

 30, fig. s, BLAINV. Malac. PL 27, fig. i, ADAMS and L. KEEVE Mollusca 

 of the Voyage of H.M.S. Samarang, 1848, PL ix. fig. 6 (a fig. of the animal 

 with the shell) in the Ind. Ocean. Terebellum convolution BLAINV. 1. 1. 

 fig. 2 a fossil species from the calcaire grassier. 



Columbella LAM. Shell oval, spire short. Aperture emargi- 

 nate towards the end. Labrum gibbous internally, often denticu- 

 late, narrowing the aperture. 



Columbella rustica LAM., Valuta rustica L., POLI Test. utr. Sic. ill. PL 

 46, figs. 39 41; Columbella strombiformis L., BLAINV. Malac. PL 30, 

 fig. 5, &o. 



Ancillaria LAM. Shell oblong, smooth. Aperture longitudinal, 

 sinuate towards the end. Columella tumid, contorted. Spire short, 

 with sutures of wreaths not canaliculate. 



