362 EXPLANATION OF PLATES. 



TAB. XXIX. 



Fig. 1. Cetochilus septentrionalis. 



a. Styliform appendages in front of cephalo-tkoraeic segment, 

 which take the place of the sharp-pointed beak of Anoinalocera. 

 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. 1. Anteunule. 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. Cantliocamptus minutus, to show the club-shaped 

 organ attached to the abdomen. 



4, 5, 6. Cantliocamptus fur catus. 



4 a. Ovary. 



5 a. Antennule. b. Last pair of feet. 



These figures are copied from drawings made by Mr. Salter. 



7, 8. Notodelpliys ascidicola. 



7 a. Antennule (?). b. Mandible, c. First pair of foot-jaws, d. Se- 

 cond do. e. Third do. / 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. e,f. Second pair of foot-jaws, or ^suckers, 

 g. Third pair of foot-jaws, or prehensile feet. //, i. First pair 

 of natatory legs, k, I. Fourth pair of do. 



