1. Late juvenile. Height 12 mm. At this stage, spire almost enveloped by final whorl, signs of adult shell ridges developing, shell shape approaching that of the adult, but still the juvenile white. Late juvenile shells are often larger than early adults.
2. Late juvenile. Height 12 mm. At this stage, spire almost enveloped by final whorl, signs of adult shell ridges developing, shell shape approaching that of the adult, but still the juvenile white. Late juvenile shells are often larger than early adults.

Late juvenile. Height 12 mm. At this stage, spire almost enveloped by final whorl, signs of adult shell ridges developing, shell shape approaching that of the adult, but still the juvenile white. Late juvenile shells are often larger than early adults.

Trivia monacha

© I.F. Smith

Trivia monacha

© I.F. Smith