no. 1404. PARASITIC COPEPODS—CALIGID.E— WILSON. 651 



spines, of which three are terminal. The outer of these terminal three 

 is rudimentary and so small as to be easily overlooked. The tips of the 

 legs slightly overlap the abdomen, the basal joints, which are the same 

 size throughout, being about as long as the two terminal joints. On 

 the outer margin of the basal joint near the distal end is a short plumose 

 seta; there is a large spine at the distal end of the second joint, and one 

 on the outer margin of the terminal joint at about its center. At the 

 bases of this last spine and also of each of the three terminal spines 

 there is on the ventral surface a small lamina whose edge is cut into 

 very long and acuminate teeth. The fifth legs are so small as to be 

 wholly invisible dorsally and they can be seen on the ventral surface 

 only with difficulty. 



Total length 4.75 mm. Length of carapace 2.6 mm.; width of 

 same 2.75 mm. ; length of genital segment 1 mm. ; length of abdo- 

 men 0.7 mm.; length of egg strings 2.2 mm. Sixty eggs in each. 



Mile. — Carapace three-fifths of the entire length, and proportion- 

 ally narrower posteriorly than in the female, but wider anteriorly. 



Frontal plates wider and more prominent, and the lunules larger. 

 The eyes appear a little farther back in the carapace, owing to the 

 width of these frontal plates. 



Thoracic area as large as in the female and rounded similarly. The 

 glands in this area which show as dark masses through the dorsal 

 integument are of peculiar shape and very similar in the two sexes. 

 Each consists of a large ovate posterior portion and a smaller elliptical 

 or spherical anterior portion, the two being connected by a narrow 

 neck. On the inner side both portions of these glands are flattened 

 against the intestine and present a nearly straight line for their entire 

 length. 



The free segment is longer and wider than in the female, and is 

 similarly constricted in front of the fourth legs. It is fully as wide as 

 the genital segment and overlaps the anterior end of ' the latter on 

 either side by the width of the basal joint of the fourth legs. 



The genital segment is oblong, narrowed considerabty anteriorly 

 where it joins the free segment, and has a convex posterior margin. 

 On either side near the posterior end is a broad and blunt triangular 

 spine, on the ventral side of which may be found the fifth legs. 



The abdomen is about two-thirds the width and seven-eighths the 

 length of the genital segment, two-jointed, the basal joint considerably 

 the smaller, with a strongly convex posterior margin. 



The abdomen widens a little posteriorly and the anal laminae are set 

 into the sides as much as the end of the terminal joint. They are very 

 large and foliaceous, but the plumose seta 1 upon them are not much 

 larger than (hose of the female. 



Tin' appendages are very similar to those of the female, the chief 

 differences being in the enlarged and branched second antennae, the 



