Bull. U S. F. C. 1895. The American Lobster. (To face page 89.) 
Plate C. 
a b c 
Cut 8.— The gastrolith of a lobster nearly ready to molt, removed from the wall of the 
stomach. 
a , seen from the outside; b , from the inside (toward cavity of stomach), and c, in 
transverse section. From adult male, lobster No. 2, table 24. For chemical analysis 
of this gastrolith. see Appendix II, No. 4a of table. Natural size. 
VP 
-""I 
Cut 10. — Section of the deciduous portion of old cuticular 
lining of stomach overlying gastrolith. See cut 9, oc ] . 
89 diameters. 
Cut 11. — Section of gastrolithic sac from wall of stomach 
underlying gastrolith, as it appears while the latter is 
still in place in the stomach. From a lobster nearly 
ready to molt. August 2, 1894. See cut 9, gp. 89 diam- 
eters. 
D, connective tissue of dermis. op, cliitinogenous 
epithelium, no 1 , new cuticle. 
Cut 9. — Diagrammatic section through the wall of the 
stomach of a molting lobster, cutting gastrolith. 
op, cliitinogenous epithelium. gg } gastrolith, a differ- 
entiated part of the old cuticle. gp, gastrolithic sac. n. 
c 1 , new cuticle of gastrolithic sac. iw, outer side of 
stomach-wall next body-cavity. New 0, new cuticle. 
oc\ the deciduous part of cuticle overlying gastrolith. 
Old C , old cuticle. S , interior of stomach. WS, wall 
of stomach. 
Drawn by F. H. Herrick. 
