262 CALIFORNIA ACADEMY OF SCIENCES. 



EXPLANATION OF PLATE IV. 



Fig. 61. .Pandalus Dana, carapace. 



Fig. 62. " acicle. 



Fig. 63. Syncaris Trewi, carapace. 



Fig. 64. Penceus californiensis, carapace. 



Fig. 65. " " hand and carpus of first pereopods. 



Fig. 66. " hand and carpus of second pereopods 



Fig. 67. hand and carpus of third pereopods 



Fig. 68. " " abdomen. 



Fig. 69. " " acicle. 



Fig. 70. Mysis costata, telsou and outline of uropods. 



Fig. 71. " " antenna. 



Fig. 72. " " foiu'th pleopod of a male. 



Fig. 73. Hetfromysis spinosus, autenna. 



Fig. 74. third maxilliped. 



Fig. 75. " thoracic leg. 



Fig. 76. telsou and outline of uropods. 



Fig. 77. Mystdopsis elongata, anteunule of the male. 



Fig. 78. " " anteuuule of the female. 



Fig. 79. " " autenna. 



Fig. 80. " " telsou and uropods. 



Fig. 81. Thysanresxa spinifera. 



