NO. 1580. NEW SPECIES OF ('A LIGIN.E— WILSON. 595 



Mouth tube three-fifths as wide as long, with a bony framework 

 considerably like that in Caligufi rapax. 



Second maxillse only about half the length of the mouth tube, 

 simple, slightly curved, and l)lunt; exopod papilla comparatively 

 large, with a spine actually longer than the endopod. 



Furca large; branches stout and a little curved like parentheses 

 marks. Second maxillipeds with a weak terminal claw about half 

 the length of the basal joint. 



The first swimming legs carry a short, stout spine on the posterior 

 border of their basal joint and a long, slender one at its anterior distal 

 corner. Terminal joint with the usual three claws and a spine, but 

 without any trace of the plumose seta? on the posterior border. 

 Spines on the exopods of the second legs very long and slender, those 

 at the tip of the terminal joint with a wide, membranous flange along 

 both sides. 



The seta next to these claws also has a narrow membranous flange 

 along its outer side. 



Rami of the third legs well separated; claw at the base of the exo- 

 pod large, slightly curved, and blunt. 



Fourth legs stout and three-jointed, with five claws, the terminal 

 one at the inner corner about twice as long as the others. Fifth legs 

 invisible dorsally and almost so ventrally, consisting of very small 

 papilla\ each with a single seta and situated on the ventral surface 

 at the posterior corners of the genital segment. 



Oviducts not very densely coiled inside the genital segment; cement 

 glands comparatively large and inclined somewhat away fi-oni the 

 central axis, the cellular portion wide and club-shaped. 



Total length, 3.75 mm.; carapace, 1.6 mm.; genital segment, 

 1 mm. ; abdomen, 0.86 mm. ; width of carapace, 1.6 mm. ; egg strings, 

 1.2 mm. 



Male. — Carapace more than half the entire length, but otherwise 

 as in the female. Free segment very short and as wide as the genital 

 segment; the latter oblong, one-half longer than wide, and only one- 

 fourth the width of the carapace. 



Abdomen four-fifths as long as the genital segment, two-jointed, 

 the terminal joint twice the length of the basal. 



Second antenna^ small with a broad and spathulate terminal claw, 

 which is bent in a half circle. These antennae are not branched as in 

 most Caligus males, but the base of the claw is armed with a knob of 

 corrugated chitin on its inner surface. 



First maxilla? actually longer than the second antennae, slender and 

 acuminate, and like the antennge bent in a half circle. 



Second maxillae as long as the entire mouth tube, their base broadly 

 triangular and carrying a large exopod papilla tipped with two short 

 spines. Branches of the furca curved considerably more than in the 

 female, leaving an elliptical sinus in the center. Base of the second 



