44 
I 
Fig. 1 . — Hard shell. 
Fig. 2. — Epithelium, showing modified cells for attachment of 
muscle. 
Fig. 3. — Seta. 
Fig. 5. — Cuticle stripped off shell, showing simple prolongations. 
Fig. 5. — A. Epithelium in hard condition. 
i). General epithelium in soft condition. 
C. Epithelium in soft condition, giving muscular attach- 
ment. 
V. Epithelium underlying gastric mill in soft condition. 
Fig. 6. — Formation of tendon. 
Fig. 7. — A. Appearance of voluntary muscle fibres in soft condition. 
B. More highly magnified. 
Fig. 8. — Unaffected involuntary fibrillae in muscular tissue of soft 
condition, showing similarity to fibrillae in hard 
condition. 
Fig. 9. — Small portion of lymphatic gland, soft condition. 
