REPORT ON THE COPEPODA, 63 



2. Euchceta hessei, n. sp. (PI. XX. figs. 1-13, and PI. XXIII. figs. 11-14). 



Anterior antennae nearly as long as the body, twenty-thrce-jointed in the male, 

 twenty-four-jointed in the female, the last joint half as long as the preceding one, pro- 

 vided with long setae at the apices of the third, seventh, eighth, thirteenth, twenty-third, 

 and twenty-fourth joints, and with very short setae on the intermediate joints ; rostrum 

 long and simply curved ; in the female there is a very small terminal joint, but this is 

 wanting in the male, its place being supplied by a few setae and a pyriform sensory 

 appendage. Posterior antennas (PI. XX. fig. 3) as in Euchceta prestandreCB ; those of the 

 female more densely setose than in the male. Mandibles and anterior foot-jaws (figs. 4, 

 8, 9) as in Euchceta prestandrece. External branch of the maxilla-palp in the female 

 (fig. 5 a) rudimentary, inner branch (b) elongated, digitiform ; in the male (fig. 6), the 

 maxilla is very small, the biting portion altogether wanting. The anterior foot- jaw is 

 wanting in the male, but in the female (fig. 7), has the innermost seta of each digit 

 pectinated near the base with a row of short rigid setae, the rest of the setae simply 

 plumose : the last seta of the second joint of the posterior foot-jaw bears also a marginal 

 comb-like row of cilia. The structure of the swimming feet is exactly as in Euchceta 

 prestandrece, except as to the terminal spines (fig. 10), which are much more strongly 

 serrated, the number of serratures being from twenty to twenty-two on each spine. The 

 basal joints of the fourth pair of feet in the female (fig. 10, a) are armed on their internal 

 margins with a comb-like row of about five very broad and strong spines. The fifth 

 pair of feet of the mede (fig. 11) does not possess any toothed appendage, but in other 

 respects is much like that of the preceding species. The abdomen in both sexes is four- 

 jointed, but much shorter and stouter in the female (figs. 12, 13). Caudal stylets about 

 as long as broad ; setae nearly equal in both sexes, scarcely longer than the abdomen. 

 Length, l-8th of an inch (3"1 mm.). The two specimens taken between Japan and 

 Honolulu were twice this length. 



Habitat. — This species was found in a gathering from lat. 38° 7' S., long. 94° 4' W. 

 (November 6th, 1875, near Station 295). The captures of Copepoda in this Station con- 

 sisted almost entirely of two species in about equal numbers : — Euchceta hessei and 

 Calamus valgus. It occurred also amongst surface animals from lat. 36° 32 S., long. 132° 

 52' W. (Station 287). Two specimens were found in a surface gathering made between 

 Japan and Honolulu, and a few at Station 352, lat. 10° 55' N., long. 17° 46' W. ; between 

 Api and Cape York ; and at a Station near the Philippine Islands (January 9th, 1875). 



3. Euchceta pidchra (Lubbock), (PI. XIV. figs. 6-9, PL XX. figs. 14-19). 



Undina pulchra, Lubbock, On some Entomostraca collected by Dr. Sutherland, Trans. Eutoni. 

 Soc, vol. iv., 1856, pi. iv. figs. 5-8, and pL vii. fig. 6. 



Length, l-6th of an inch (4 - 2 mm.). Ceplialothorax robust, rounded in front, 

 obtusely angulated behind, rostrum short, simply curved. Anterior antennae as long 



