NO. 1580. NEW SPECIES OF CALIGINjE-WILSON. 605 



The second maxillae are elongate and triangular, the base but 

 little enlarged, opposite the center of the mouth tube, and some lit- 

 tle distance from it. Their tips are slender, straight, ami simple, 

 the entire appendage being somewhat longer than the mouth tube. 

 The mandibles are slender with a cm'ved terminal joint, armed with 

 coarse rounded teeth on the concave margin and fine pointed teetli 

 on the convex margin, another exceptional featm-e in this genus. 



The mouth tube is short, two-thirds as wide as long, with a bony 

 framework very similar to that in LepeopJitheirus hippoglossi, the 

 soft flap at the tip of the upper lip being relatively wider, and the 

 fringe of hahs around the mouth opening longer and denser. 



The fu'st maxillipeds are long and slender, and the basal joint is 

 but little swollen; the terminal joint, including the claw, is twice 

 the length of the basal and ends in a single claw which is strongly 

 curved near its tip. At the base of this claw are two medium sized 

 spines, one on the inner and the other on the ventral margin. The 

 claw itself is branched, giving oft' two small accessory spines on its 

 outer margin; so far as known this has never before been reported 

 in this genus. 



The second maxillipeds are large and stout antl of peculiar struc- 

 ture; the basal joint is swollen and of normal form, the terminal 

 claw is short and not much curved. From the base of this claw on 

 the inner margin arises a stout conical spine, half the length of the 

 claw and as wide at the base as it is long. The use of this spine is 

 problematical, since from its size and position it must prevent the 

 terminal claw from closing down on the basal joint in the usual 

 manner. 



The furca is large and relatively the longest of an}^ yet described; 

 its base is in the usual position, but when closed down against the ven- 

 tral surface the tips of its branches reach beyond the posterior mar- 

 gin of the fh'st legs. 



These branches are wide and stout, with spathulate tips, and 

 they diverge in the shape of a broad V. Each carries a slender, 

 pointed secondary branch upon its inner margin near the base. 

 These secondary branches are two-thu*ds as long as the primary ones, 

 are parallel with each other, and leave the central sinus of a broad 

 U -shape. 



The basal joints of the first legs are each armed with two spines 

 on the posterior margin, the outer one wider and longer than the 

 inner. The second joint carries a short and blunt spine at its distal 

 anterior corner. The terminal claws decrease regularly in size from 

 in front backwards. 



The second legs are of the ordinary pattern; the rami of the thuxl 

 legs are so close together as almost to touch on their adjacent mar- 

 gins. Each ramus is two-jointed; the basal spine on the exopod is 

 large and nearly straight. The fourth legs are tlxree-jointed with 



