THE AMERICAN LOBSTER. 
249 
Fig. 184. Profile view of masticatory stomach of male lobster 7.5 inches long. Nearly ready to molt, 
showing gastrolith in place in the wall of stomach. For drawings of the gastrolith as it 
appears when it is dissected out and separates into its constituent spicules, see fig. 165, 
plate 42. Two-thirds natural size. 
Plates 45a and 45&. 
Fig. 185. Molted shell of lobster shown in fig. 186. No. 1, table 24. This represents the size of the 
lobster before the molt. Length 5£ inches. Natural size. 
Fig. 186. The soft lobster, shortly after the shell shown in fig. 185 was cast off. Length, 61 inches. 
Natural size. These drawings show the average increase in size which is effected by a 
single molt 'see Chapter III). 
Plate 46. 
Fig. 187. Left cheliped of lobster, from below, showing budding and repetition of parts in propodus or 
sixth joint. 
Fig. 188. Same as fig. 187, seen from above. Both figures from photographs, and both natural size. 
Plate 47. 
Fig. 189. Part of right crushing-chela of female lobster, 11 inches long, seen from above, showing 
budding of dactyl. Woods Hole, Massachusetts, July 13, 1894. Two-thirds natural size. 
Fig. 190. Propodus of left crushing-claw, from below. This and figs. 191-196 are from specimens in 
Peabody Academy of Science, Salem, Massachusetts, all from adult lobsters. Two-thirds 
natural size. 
Fig. 191. Left crushing-claw, seen from above. Outgrowth from dactyl in horizontal plane; dactyl 
closes under propodus. Two-thirds natural size. 
Fig. 192. Left crushing-chela, from above. Secondary dactyl bent downward slightly; no teeth; 
dactyl laterally compressed. S, spine of dactyl in primary symmetry; S ' , spine of dactyl 
in secondary symmetry. This supernumerary appendage probably represents two dactyls 
fused together. Two-thirds natural size. 
Fig. 193. Right cutting-chela, from below. Fingers bent up; dactyls articulate at joint with pro- 
podus ; primary dactyl and one of the adjacent secondary dactyl united. S, supernumerary 
dactyl in primary symmetry. Two-thirds natural size. 
Fig. 194. Dactyl of left cutting-claw, seen from below. It is bent horizontally upon itself, into an 
angle of about 80°, this being probably due to irregular growth in the regeneration of a 
lost part. Two-thirds natural size. 
Fig. 195. Chela of second or third pereiopod, from below, showing two supernumerary dactyls. 
Two-thirds natural size. 
Fig. 196. Right dactyl of cutting-chela, seen from outer side. Bifurcating branches hear teeth, which 
are not, however, apposed. Two-thirds natural size. 
Plate 48. 
Fig. 197. Deformed right cutting-claw. Accessory appendage bent downward from horizontal plane 
about 50°. The small terminal joint of the superadded part probably represents two 
dactyls fused together. S, spine of dactyl in primary symmetry; S', spine of dactyl in 
secondary symmetry. Two-thirds natural size. 
Fig. 198. Right cutting-claw. Propodus apparently deformed by the irregular growth produced in 
the regeneration of a lost part. Two-thirds natural size. 
Fig. 199. Double monster of first larva of lobster. Raised at Fish Commission station, Woods Hole, 
Massachusetts, by Professor J. A. Ryder; seen from above. 13 times'natural size. 
Fig. 200. Double monster of first larva of lobster, from Professor J. A. Ryder. Fusion of the organs at 
the anterior extremity has been carried to such a degree that the compound eyes are now 
represented by a small median spot of pigment. 13 times natural size. 
Plate 49. 
Fig. 201. Gland-cell from tegumental gland of second maxilla. Macerated in B61a Haller’s fluid for 
several days, and stained in methyl green. 733 times natural size. 
Fig. 202. Gland-cell from same preparation as fig. 201. 733 times natural size. 
