A STUDY IN MOEPHOLOGY. 
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Fig. 54a. Outline of anterior end of carapace. 
Fig. 55. Dorsal view of tlie anterior end of the same larva. 
Fig. 56. First antenna of the same larva. 
Fig. 57. Second antenna of the same larva. 
Fig. 58. Mandible at same stage. 
Fig. 59. Locomotor appendages of the left side, at same stage, seen from above. 
PLATE 7. 
Fig. 60. Side view of a young Lucifer , about i^foth inch long, which was produced by 
the moulting of a larva like that shown in fig. 54 (this stage agrees pretty 
exactly with the Mastigopus stage of Sergestes). 
g. Antennal gland. 
n. “Neck.” 
c. Carapace. 
Fig. 61. Half-grown Lucifer, about \ an inch long. 
g. Antennal gland. 
eg. Cerebral ganglia. 
co. Commissures to ventral ganglia. 
s. Cephalic pouch of stomach. 
h. Heart. 
c. Carapace. 
Fig. 62. Inner surface of mandible of adult. 
Fig. 63. Outer surface of mandible of adult. 
Fig. 64. Outer surface of first maxilla of adult. 
Fig. 65. Inner surface of same. 
PL ATE 8. 
Fig. 66. Head of a small female about -Jrds of an inch long, seen from below. 
Fig. 67. Second maxilla of same. 
Fig. 68. First maxilliped of right side of adult. 
Fig. 69. Inner surface of same. 
Fig. 7 0. Second maxilliped of adult. 
PLATE 9. 
Fig. 71. Dorsal view of tip of telson of adult female. 
Fig. 72. Side view of last abdominal somite and swimmerets of adult female. 
Fig. 73. The same parts of an adult male. 
