THE AMERICAN LOBSTER. 243 



Plate 30. 



Fig} 63. Left second maxilliped of first larva, from anterior face. Epipodito is developed on basis; 

 no distinct podobranchia. 50 times natural size. 



Fig. til. Left second maxilliped of fourth larva, from anterior face. Podobranchia present, but rudi- 

 mentary as in the adult. 31? times natural size. 



Fig. 65. Right third maxilliped of fourth larva, from dorsal surface, natural position. 22 times 

 natural size. 



Fig. t>l>. Left first pereiopod of first larva, from below. The arthrobranchise which issue from the 

 membranes between the body and appendage, and are sometimes torn off with the latter, 

 are also shown in tig. 65. 52 times natural size. 



Fig. 67. Left first pereiopod of fourth larva, from below. The small tubercles of the chelaj are 

 scarcely visible in this position. The exopodite (compare fig. 66), now a short rudiment at 

 the base of the appendage, does not entirely disappear until the fifth molt. 22 times 

 natural size. 



Fig. 68. Part of left third maxilliped of fourth larva, from below, showing serrated inner margin of 

 third segment. 22 times natural size. 



Fig. 69. Left third maxilliped of first larva, from above. 50 times natural size. 



Plate 31. 



Left fourth pereiopod of first larva, from above. 50 times natural size. 



Serrated spine from propodus of left second pereiopod of fourth larva. 153 times natural size. 



Telson of embryo with eye pigment, July 26. Picro-sulphuric acid preparation ; teased from 



egg in glycerin. 22 times natural size. 

 Right second pereiopod of first larva, from the side. 50 times natural size. 

 Left second pereiopod of fourth larva, from above. 22 times natural size. 

 Left fifth pereiopod of fourth larva, from above. 22 times natural size. 

 Left fourth pereiopod of fifth larva, from above. The podobranchia with epipodite, the arthro- 



branchius and the pleurobranchia are here shown. 30 times natural size. 

 Fig. 77. Antenme of embryo, the telson of which is shown in fig. 72. 22 times natural size. 



Plate 32. 



Fig. 78. Bud of first left abdominal appendage of fifth larva; length of larva 14 mm. Drawn from 



molted shell of lobster No. 36, table 34. July 30, 1892. 63 times natural size. 

 Fig. 79. Seminal receptacle of female. Lobster No. 17, table 33. Length of lobster 35 mm. 14 times 



natural size. 

 Fig. 80. Left first abdominal appendage of lobster No. 37, table 34; eighth stage; length 19.75 mm. 



(0.78 inch); raised from egg. 63 times natural size. 

 Fig. 81. Ventral view of young female lobster; length 51.8 mm. (2.04 inches); No. 19, table 33. The 



seminal receptacle is here shown in process of development. Compare with plate 11. 5.3 



times natural size. 

 Fig. 82. Left first abdominal appendage of the sixth stage of development. From lobster No. 34, 



table 34. Drawn from molted shell. Length of lobster in sixth stage 16.3 mm. 63 times 



natural size. 

 Fig. 83. Left first abdominal appendage of lobster No. 34, table 34, in seventh stage. Length of lob- 

 ster 18 mm. (0.71 inch). 63 times natural size. 

 Fig. 84. Left first abdominal appendage of lobster in sixth stage. No. 36, table 34; length of lobster 



16 mm. 63 times natural size. 

 Fig. 85. Left first abdominal appendage of female in eighth stage. Lobster No. 3, table 34. Length 



of lobster 21.2 mm. Appendage segmented into two parts. For ventral view of thorax of 



this lobster see fig. 89. 63 times natural size. 

 Fig. 86. Left first abdominal appendage of female. Lobster No. 17, table 33. Length of lobster 35 



mm. (1.39 inches). 14 times natural size. 

 Fig. 87. Left first abdominal appendage of male. No. 18, table 33. Length of lobster 36.3 mm. (1.43 



inches). 14 times natural size. 

 Fig. 88. Left first abdominal appendage of female. No. 19, table 33. Length of lobster 51.8 mm. 



(2.03 inches). For seminal receptacle of this lobster see fig. 81. 14 times natural size. 



Fig. 



70. 



Fig. 



71. 



Fig. 



72. 



Fig. 



73, 



Fig. 



74. 



Fig. 



75, 



Fig. 



76, 



