REPORT ON THE COPEPODA. 69 



a strong spinous projection, which nearly meets a corresponding spine of the right thoracic 

 angle. 



Habitat. — Off Port Jackson, Australia; between Sydney and Wellington: off Kandavu, 

 Fiji ; Philippine Islands ; lat. 36° 48' S., long. 39° 3G' W. ; several stations in the 

 Atlantic, between lat. 10° S. (near Ascension Island) and 27° S. (west of the Canaries). 



From the list of localities it will be seen that the distribution of this species is almost 

 identical with that of Candace pectinata. The points of difference between the two ar< 

 to be found in the style of armature of the right male antenna, and in some slight 

 divergences in the fifth feet of both sexes. And, as far as I have been able to observe, 

 the distribution of colouring in the swimming feet affords a good diagnostic mark ; in 

 Candace pectinata the colouring extends over only half the breadth of the outer branch, 

 but (usually) over the whole of the inner branch; in Candace pachydactyla the whole 

 of the last joint of the outer branch is coloured, while the inner branch is altogether 

 colourless. 



Several male specimens showed an immature form of the fifth pair of feet (fig. 7), and 

 in these the anterior antenna? had not taken on the special characters of the male. 1 



3. Candace truncata, Dana (PI. XXVIII. figs. 12-15, and PI. XXIX. figs. 1-14). 



Candace truncata, Dana, Crust. U. S. Expl. Exped., p. 1118, pL lxxviii. fig. 8, a-d. 



? ,, bispinosa, Claus, Die frei lebeuden Copepoden, p. 191, pi. xxvii. figs. 9-16, and pi. xxxiii. 



fig. 5. 



Length, l-12th of an inch (2'1 mm.). Cephalothorax truncated both in front and 

 behind, posterior lateral angles rounded off or obtusely angular, not spined, anterior 

 antennae twenty-four-jointed, the joints more nearly equal in length than in the foregoing 

 species ; several of the basal joints (fig. 4) bearing long, slender spines. The right 

 anterior antenna of the male (fig. 2) has no denticulated plates, and the joints, both 

 on the distal and proximal sides of the hinge, are nodose at their apices. Outer margins 

 of the swimming feet very finely serrated. Terminal spines of -the swimming feet 

 (figs. 7, 8) nearly straight (rarely twisted). Fifth pair of feet of the male (fig. 9) non- 

 prehensile, that of the right side simple, three-jointed, short, bearing a long straight, 

 plumose, apical setae, which reaches as far as the apex of the left foot ; left foot four- 

 jointed, sparingly setiferous at the apex. The fifth pair of feet in ike female (fig. 10) 

 is small, the last joint elongated, with two small apical and two marginal teeth, and on 

 the inner margin two or three setae. The first somite of the female abdomen has large 

 triangular lateral processes, that of the male is simple. Animal usually colourless. 



1 Sir John Lubbock, in his paper on the Entomostraca collected by Dr. Sutherland {Trans. Entom. Soc, 1856), 

 appears to have made his drawings of Candace pachydactyla from a male of that species and a female of Candace 

 truncata, himself expressing a suspicion that more than one species were mixed together in his material 



