Elements of conchology Prepared Elements of conchology / Prepared for the use of schools and colleges elementsofconcho00rusc Year: 1844 48 SCALARIA.^CYCLOSTOMA.—VALVATA. equatorial regions of the Atlantic Ocean. It is a common^ heavy shell; it has a horny operculuni, and is remarkable for a tooth situate at the orifice of the umbilicus. 33. The Delphinula has a thick shell like the last, but rolled almost in the same plane, and the aperture is entirely formed by the last whorl of the spire (J?^. 45): ' the most common species is remarkable for its twisted and' branching spines. 34. The TuRRi
Elements of conchology Prepared Elements of conchology / Prepared for the use of schools and colleges elementsofconcho00rusc Year: 1844 48 SCALARIA.^CYCLOSTOMA.—VALVATA. equatorial regions of the Atlantic Ocean. It is a common^ heavy shell; it has a horny operculuni, and is remarkable for a tooth situate at the orifice of the umbilicus. 33. The Delphinula has a thick shell like the last, but rolled almost in the same plane, and the aperture is entirely formed by the last whorl of the spire (J?^. 45): ' the most common species is remarkable for its twisted and' branching spines. 34. The TuRRiTELLA and Scalaria have a very elongated spire : in the first {Jig. 33, page 44),. the mouth or aper- ture of the shell is formed as in the Turbo, properly socalled, a^nd in the last, it is similar to that of the Delphinula. Fig. DELPHINULA.
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