no. 2354. NEW SPECIES OF PARASITIC COPE PODS— WILSON. 



is also a pair of very rudimentary legs connected with this sixth seg- 

 ment, which appear as small bifid papillae, one on the outer margin of 

 each lobe at its base. There are no dorsal plates on this segment. 



The claw at the tip of the second antennae is evidently designed 

 to hold securely when it has once been fastened to any part of the 

 host. In two of the specimens from Mustelus lunulatus it was 

 barbed as well as toothed, as shown in figure 20. 



Internal characters. — The esophagus is short and enters the 

 stomach at its anterior end on the ventral surface. The stomach- 

 intestine starts in the head immediately beneath the mouth and 

 widens gradually backward to the genital segment, then narrows 

 until it reaches the level of the vulvae, where it is suddenly con- 

 tracted into a short rectum. There is no demarcation between the 

 stomach and intestine. 



The ovaries are situated just beneath the dorsal surface of the head, 

 above the anterior end of the stomach ; each oviduct starts from the 

 anterior end of the ovary and runs backward along the dorsal surface 

 of the stomach to the genital segment, where it turns sidewise away 

 from the midline and forms an S-loop before reaching the vulva. 



The cement glands are ventral to the oviduct, their anterior ends 

 curved outward, their posterior ends slightly enlarged; they show 

 distinct segmentation. Their inner surface is attached to the sides 

 of the stomach intestine in two places. The semen receptacles are 

 just inside of the vulvae and are connected across the midline. 



Specific characters of young female. — Carapace like that of the 

 adult; lateral portions of the dorsal plates belonging to the second 

 segment visible behind the carapace. These and the dorsal plates 

 of the fourth segment, reduced to tiny semicircles, are confined to 

 the lateral margins of the segments and do not reach the midline. 

 Fifth legs at the posterior corners of the genital segments and vis- 

 ible dorsally, each with a tiny plate inside of it on the dorsal surface 

 of the posterior margin of the segment. No traces of a sixth seg- 

 ment. Abdomen and anal laminae like those of the adult, but entirely 

 free and not covered at all by the genital segment. Anal setae re- 

 latively long and strongly curved. 



Of the appendages the second antennae are large and stronger than 

 in the adult, and the forceps peg of the maxillipeds is much more 

 complicated, being composed of raised laminae, parallel with one 

 another and having toothed edges (fig. 23). Inside the forceps peg, 

 between it and the base of the claw on the anterior margin, is an 

 accessory peg, also covered with raised laminae. The basipods of the 

 third and fourth legs are smaller than in the adult, but otherwise the 

 legs are the same. 



Total length, 3.50 mm. Carapace, 1.80 mm. long, 'J mm. wide: 

 genital segment, 1 mm. wide. 



