| The protoconch is paucispiral or multispiral, and is smooth except for a few axial riblets near the junction with the teleoconch. |
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| The latter species has a smooth, valvatiform, dextrally coiled teleoconch and a sinistral, anastrophic protoconch. |
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| On the dorsal portion of the rostral face, the shell layers extend ventrolaterally from those of the protoconch. |
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| It is not uncommon for both Recent and fossil volutes from southern South America to have a protoconch that is corroded to various degrees by cold acidic waters. |
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| This protoconch is discoidal or almost dicoidal and sinistral. |
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| These gastropods have slender, high-spired, multiwhorled shells bearing a sinistral protoconch and were united by Knight in the family Streptacididae. |
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| The dimensions of the protoconch were measured according to the method set out previously. |
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| Spatial and temporal variation in statolith and protoconch trace elements as natural tags to track larval dispersal. |
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| The smooth protoconch and nature of the ribs appear to be that of Palaeozygopleura. |
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| This considerable variation is due to the subellipsoidal form of the protoconch. |
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| The embryonic stage, consisting of a small ellipsoid protoconch and ammonitella, ends at about 0.6 mm. |
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| None of the species examined show any kind of varix associated with the protoconch lip. |
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| Shell height and diameter measurements as well as protoconch dimensions and whorl counts were measured using the methods set out by Herbert and Moussalli. |
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| Borderline cases include the type species, Kermia benhami, which is atypical in its protoconch possessing arcuate axial riblets, with only their bases diagonally cancellated. |
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| Protoconch size variation along depth gradients in a planktotropic Epitonium. |
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