The Cambridge natural history . g theBuccinidae, Baccinopsis possessesa curiously degraded radula, thecentral tooth having no cusps, butbeing reduced to a thin basalplate, while the laterals are alsoweakened. This degradation fromthe type is a remarkaljle featureamong radulae, and appears to becharacteristic, sometimes of a wholefamily, the Columbellidae ( of degraded forms 123, B), Sometimes of a genus,of radula: A, Cantha,-us pagochcs g^nietimes again of a single species. Reeve, Panama (nascent end), x 40 ; o o i A, same radula, central and front ThuS in CantllurUS (a SubgC

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The Cambridge natural history . g theBuccinidae, Baccinopsis possessesa curiously degraded radula, thecentral tooth having no cusps, butbeing reduced to a thin basalplate, while the laterals are alsoweakened. This degradation fromthe type is a remarkaljle featureamong radulae, and appears to becharacteristic, sometimes of a wholefamily, the Columbellidae ( of degraded forms 123, B), Sometimes of a genus,of radula: A, Cantha,-us pagochcs g^nietimes again of a single species. Reeve, Panama (nascent end), x 40 ; o o i A, same radula, central and front ThuS in CantllurUS (a SubgCnUS of portion; B, Columbella varia Sowh., -r, ? \ ,i t i • +. ,^ „i ? Panama X 50 Buccinuiri) the radula is typical in the great majority of species, but )ngodus Eeeve, a large and well-grown species, it is most remark-ably degraded, both in the central and lateral teeth (Fig. 123, A).This circumstance is the more singular since C. iKigodus lives atPanama side by side with C. ringeus and C. insignis, both of which.

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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895