G-. M. Thomson. — On the New Zealand Copepoda. 97 



(4 to 6 times) longer than broad, about as long as two last abdominal 

 segments ; outer margin fringed with a row of fine teeth. Innermost tail 

 setae considerably longer than abdomen. 



Length -^ of an inch. 



Bab. Tomahawk lagoon, near Dunedin. 



My specimens are rather larger than the European form, but in all 

 points of structure agree closely with Dr. Brady's description and figures. 

 $. — Anterior antenna, 8- jointed. 



4. Cyclops chiltoni, n. sp. PI. IX., figs. 11-19. 



Cephalothorax narrow-oblong in form, last segment hardly wider than 

 abdomen ; first segment three-fifths of the length of the whole ; rostrum 

 very short. Abdomen slender, subequal with cephalothorax in length, 

 segments about as broad as long, surrounded by rings of minute comb-like 

 teeth. Anterior antennae three-fourths as long as the first segment of the 

 body, rather stout, joints tapering to the extremity, first about four times 

 as broad as the last ; relative lengths as follows : — 



1, 2, 3, 4, 5, 6, 7, 8, _ 

 IB. ltX 7. 16. 1. 6^ 1L W.' 

 setse tolerably numerous on the first four joints, last joint with 4 (sometimes 

 5 or 6, some very small) terminal setae. Posterior antennas large ; the long 

 seta on the basal joint almost smooth. Mouth organs very small. First 

 four pairs of legs with strong spines. Fifth foot very small, 1-jointed (?), 

 bearing 3 spines, the lower one of which is plumose. Caudal segments 

 about 3 times as long as broad ; central caudal setae three-fourths as long 

 as abdomen. Length, y 1 ^ inch. 



Hab. Numerous specimens obtained in gravel pits at Eyreton, by Mr. 

 C. Chilton, after whom I have named it. 



Quite distinct from the two other species characterized by the 8-jointed 

 anterior antennae, viz., C. crassicomis, Muller, and C. magnicejos, Lilljeborg. 

 e. — Anterior antennae, 6-jointed. 



5. Cyclops cequorens, Fischer. PI. XL, figs. 16-18. 



Body gradually attenuated from before backwards. Anterior antennae 

 much shorter than first segment of thorax, stout at the base, and only 

 slightly tapering towards the apex ; 1st and 2nd joints stout, subequal, 3rd 

 short, 4th the longest, 5th short, 6th about twice as long as 5th ; the fol- 

 lowing represents the relative lengths of the joints in the majority of my 



specimens (females) ' — ' — ' Mandibles dilated at the apex and 



divided into several slender sharp teeth. Maxillae strongly toothed. Feet 

 of the 1st pair short, and furnished with rather short setae. Fifth feet bear- 

 ing a triangular joint, dilated towards the extremity, and furnished with 3 

 7 



