Dr. Leach’s observations , &c. 
296 
arm, fig. 6. The membrane is subject to great variation in 
size and form, and is often different on the arms of the same 
individual. 
One male only was sent home, all the others were females, 
which had placed their eggs in the spiral part of the shell. 
One female, that had deposited all her eggs, withdrew 
completely within the shell, as in fig. 3; her body on one 
side had all the impressions of the shell, and the suckers on 
all the arms were diminished in size, as if from pressure. 
Explanation or Plate XII. 
Fig. 1. Ocythoe Cranchii sitting within the shelL 
Fig. 2. The animal without the shell. 
Fig. 3. One completely retracted within the shell. 
Fig. 4. Ditto taken out of the shell, showing the impres- 
sions of the shell on the body. 
Fig. 5. Left superior arm (common appearance) magnified. 
Fig. 6. Right superior arm (variety) magnified. 
