REPORT ON THE COPEPODA. 65 



5. Euchceta australis, n. sp. (PI. XXI. figs. 5-11). 



Length, 1— 6th of an inch (4"2 mm.). Cephalothorax elongated, robust ; anterior 

 antennae as long as the body, in the female twenty-four- in the male twenty-one- (?) 

 jointed ; the basal joints more or less villous ; in the female several of the joints bear 

 single long apical seta?, the rest have two or more very short hairs ; in the male (fig. 6) 

 there are no excessively long setae, and the shorter ones are but few. The terminal spines 

 of the swimming feet (fig. 11) are not so coarsely serrated as in Euchceta philippii, the 

 serrae being about twenty-five on each spine ; and the secondary spines are quite small. 

 The general characters of the feet and mouth-apparatus in both sexes are those of a 

 normal Euchceta. The first abdominal segment of the female (fig. 10) is serrated at the 

 outer angles, the caudal stylets are about as long as broad, the tail setae equal and densely 

 plumose. 



Habitat. — Between Api and Cape York ; and in a deep-sea gathering down to 

 2650 fathoms, lat. 36° 44' S., long. 46° 16' W. (Station 325). 



It is of course impossible to say at what depth the specimens brought up in 

 the net from 2650 fathoms were really caught, but as one at least of the species 

 belonging to this gathering (Euchceta gigas) has been found in no other, it seems 

 probable that they were brought from a great depth ; and I entertain no doubt whatever 

 that it is from the abyssal water and from the bed of the sea itself in those regions, as 

 well as in more moderate depths, that we must now hope to obtain interesting or novel 

 examples of Copepoda. In some specimens of Euchceta australis there was a brightly 

 refracting spot near the middle of the first body-segment, which may perhaps be a pleural 

 eye, but I was unable to obtain a sufficiently distinct view to satisfy myself as to its 

 nature. 



6. Euchceta gigas, n. sp. (PI. XXII. figs. 1-5). 



Length, 22-100ths of an inch (5"25 mm.). Female. — Body robust, obtusely angulated 

 in front, posterior lateral angles of the thorax armed with sharp slender spines : anterior 

 antennas (fig. 2) as long as the cephalothorax, twenty-three-jointed, joints from the third 

 to the seventh very short, eighth about twice as long, last six joints the longest ; the 

 limb is provided throughout its whole length with marginal setae, none of which are 

 excessively long. The teeth of the mandible (fig. 3) are very strong, the two larger 

 ones with falcate apices. The terminal spines of the swimming feet (fig. 4) are closely 

 and finely serrated on the outer, and very densely setose on the inner margin. Abdomen 

 four-jointed, short ; caudal stylets very short, broader than long ; tail setae four, spreading, 

 subequal, very densely plumose, not longer than the abdomen. 



Habitat— Lat. 36° 44' S., long. 46° 16' W., down to 2650 fathoms (Station 325). 



(ZOOL. CHALL. EXP. PART XXIII. 1883.) Z 9 



