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EXPLANATION OF PLATES. 
Tab. XXIX. 
Fig. 1 . Cetochilus septentrionatis. 
a. Styliform appendages in front of cephalo-thoracic segment, 
which take the place of the sharp-pointed beak of Anomalocera. 
b. Mandible and palpus, c. Antennule. d. First pair of 
foot-jaws. e. Second do. f Third do. g. First pair of 
thoracic feet. 
2, 3. Arpacticus chelifer , male and female. 
3 a. Antenna, b. Antennule. c. Mandible, d. Fifth pair of feet. 
e. Posterior foot-jaws. /. First pair of thoracic feet. g. Se- 
cond pair do. 
Tab. XXX. 
Figs. 1,2. Alteutha depressa , male and female. 
a. First pair of thoracic feet. b. Abdominal appendage. 
3. Canthocamptus minutus , to show the club-shaped 
organ attached to the abdomen. 
4, 5, 6. Canthocamptus furcatus . 
4 a. Ovary. 
5 a. Antennule. b. Last pair of feet. 
These figures are copied from drawings made by Mr. Salter. 
7, 8. Notodelphys ascidicola. 
7 a. Antennule (?). b. Mandible, c. First pair of foot-jaws. ^.Se- 
cond do. e. Third do. f Fourth do. g. One of the natatory 
feet. 
Tab. XXXI. 
Fig. 1. Argulus foliaceus. 
2. View of part of the carapace, to show the ramifi- 
cation of opaque tubes or intestines. 
a. Antenna, b. First pair of foot-jaws. d. Sheath containing 
the siphonal tube. c. Extremity of siphon, with its sharp- 
pointed style. <?,/ Second pair of foot-jaws, or suckers, 
g. Third pair of foot-jaws, or prehensile feet, h , i. First pair 
of natatory legs, k, l. Fourth pair of do. 
