THE AMERICAN LOBSTER. 239 



Plate 8. 



Fig. 9. Immature female lobster, dorsal view ; length 44 mm. (1.73 inchos). From photograph, life-* 

 size. Casco Bay, Maine, October, 1893. See table 32, No. 2, for further details. 

 This and the immature or adolescent lobsters represented by plates 8-13, figs. 9-18, were collected 

 in Casco Bay, Maine, in Small Point Harbor aiul vicinity, from August 31 to October 19,1893. 

 The photographs were all made from the alcoholic specimens. They are described in table 

 32, pp. 163-165. All are life-size. 



Fig. 10. Immature male lobster; length 10.3 mm. (1.59 inches). See No. 1, table 32. The right cutting- 

 claw is smaller than is normal, due to the fact that it has been recently cast off and is 

 now only partially restored. (See Chapter IV.) 



Fig. 11. Immature female lobster; length 64 mm. (2.5 inches). No. 7, table 32. 



Fig. 12. Immature malo lobster; length 58 mm. (2.28 inches). No. 5, table 32. 



Plate 9. 



Fig. 13. Immature female lobster; length 75.6 mm. (2.98 inches). No. 16, table 32. The right cutting- 

 claw is smaller than normal. See fig. 10, pi. 8, with description given above. From 

 photograph ; life-size. 



Fig. 14. Immature male lobster; length 67 mm. (2.64 inches). No. 8, table 32. From photograph; 



life-size. 



Plate 10. 



Fig. 15. Immature female lobster; dorsal view; length 86.5 mm. (3.41 inches). No. 21, table 32. From 

 photograph ; life-size. 



Plate 11. 



Fig. 16. Ventral view of immature female lobster shown in plate 10. Length 86.5 mm. (3.41 inches). 

 No. 21, table 32. From photograph ; life-size. The seminal receptacle is seen between the 

 third pair of walking legs. The normal rudimentary condition of the first pair of swim- 

 merets is also well shown. Compare with plate 7. 



Plate 12. 



Fig. 17. Immature male lobster; length 92.3 mm. (3.64 inches). No. 23, table 32. From photograph ; 

 life-size. 



Plate 13. 



Fig. 18. Immature male lobster ; length 110 mm. (4.34 inches). No. 32, table 32. From photograph; 

 life-size. 



Plate 14. 



Fig. 19. Male lobster showing abnormal, symmetrical development in large claws. Instead of the 

 usual differentiation of the great claws, one for crushing, the other for cutting (well 

 shown in fig. 6, pi. 5), both are here similar and belong to the cutting type. Length 10 

 inches ; taken at Woods Hole, Massachusetts. Seep. 144. From photograph from alcoholic 

 specimen ; abont four-fifths life size. 



Plate 15. 



Fig. 20. Right crushing-claw of lobster, probably a male, preserved in the museum of the Peabody 

 Academy of Science, Salem, Massachusetts : Estimated weight of live lobster, about 25 

 pounds; weight of skeleton of claw (including the fifth joint or carpus), the parts shown 

 in the drawing, 16f ounces. Natural size. 



Fig. 20a. Right crushing-claw of female lobster, of about average size; length 11 inches; weight li 

 pounds ; shell fairly hard. Captured at Woods Hole, Massachusetts, July 24, 1894. Natural 

 size. 

 This drawing of the claw of a lobster of average size, placed by the side of the mammoth speci- 

 men for the sake of comparison, shows more forcibly than words or figures can the great 

 difference in size which may exist between adults of the same species. Both drawings 

 are life-size, and to insure accuracy their outlines were carefully traced from the objects 

 themselves. The living weight of the smaller claw (including the entire limb) was about 

 10 ounces, that of the larger about 10 pounds. (See p. 115.) 



