Pneumodcrmon ; but their body is terminated by a tail, which is twisted spirally (" contourue'e en spirale"), and is lodged in a very delicate shell, of one whorl and a half, umbilicated on one side and flattened on the other. Cuvier adds that the animal...
The Animal Kingdom Arranged in Conformity with Its Organization: The ... - Page 20
by Georges baron Cuvier - 1834
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