NO. 9 HILTON : PYCNOGONIDS 299 



Ammothella heterosetosa, new species 

 Plate 43 



Characteristics: Body moderately heavy for the size. Scattered 

 spines over the body surface. Chelifori nearly as long as the large pro- 

 boscis. On each of the 2 long joints is a row of long, large, flat hairs ; on 

 the surface are small hairs and very small forked spines. 



Description 



Body: Moderately heavy for the size. Scattered spines or fine hairs 

 over the surface. Lateral processes well developed but shorter than the 

 body between. Suture lines between segments well marked and slightly 

 chitinized. 



Ocular segment: Well developed, almost as long as the rest of the 

 body. Ocular tubercle, a rather high mound. The eyes are not well pig- 

 mented. 



Proboscis: Not quite so long as the body and nearly as wide as the 

 body, oval in outline, narrowed some at the base to the tip. 



Jbdomen: Moderate length. It reaches just beyond the last pair of 

 transverse processes. 



Chelifori: Three-jointed. Nearly as long as the proboscis. The 1st 

 joint is a little shorter than the 2nd. The last is small and conical. The 

 long joints bear on each edge a row of long, large, flat hairs; on the sur- 

 face are small hairs ; and very small forked spines are scattered among the 

 circular spots. 



Palpi: Nine-jointed. Basal joints rather heavy ; the joints, especially 

 the last, small. A few hairs are found on these, and 2 serrate spines on the 

 9th. 



Ambulatory appendages: Quite heavy, especially the 2 basal coxae. 

 Femur rather short, 2nd tibia longer than the 1st. First tarsus well 

 developed. A spine above and several below. Second tarsus not quite half 

 so long as the 2nd tibia, a little thick. Bears a short, heavy claw and 

 paired claws. Ventrally it bears 4 or more broad teeth near the base and 

 several more slender ones farther on. It also has several long hairs dor- 

 sally. The 1st and 2nd coxae bear a number of flat, long hairs laterally. 

 The 3rd has 4. There are some on the long joints, but shorter ones pre- 

 dominate toward the end, especially on the 2nd tibia. 



Tj^pe, 1 male with eggs, U.S. Nat. Museum no. 306, Marchena 

 Island, Galapagos Islands, shore, reef north end of Island, December 2, 

 1934, Hancock Expedition. This species is distinguished by the character 

 of the setae on the appendages and body. Many of the largest ones are 



