418 PROCEEDINGS OF THE NATIONAL, MUSEUM vol. 83 



Legs very long but not so long or slender as in N. soUtarium; first 

 and third coxae about twice as long as wide and equal to one another 

 in length; second coxa almost as long as other two combined, the 

 three coxal segments together measuring 3 mm ; femur 3.8 mm ; first 

 tibia 3.6 mm, second tibia 5.4 mm ; first tarsus 0.8 mm, second tarsus 

 0,9 mm; claw 0.6 mm; auxiliary claws half as long as main claw. 

 Legs armed sparingly with rather long slender spines. Second tarsus 

 or foot armed underneath with a single row of approximately seven 

 spines, the first four of w^iich are long and well developed. 



Abdominal segment inclined posterodorsally, long and fingerlike, 

 considerabl}^ longer than the eye tubercle is high. 



Mea8U7'ements. — Body 5 mm; proboscis 1.2 mm; first segment 1.6 

 mm; neck 0.9 mm; trunk 3.2 mm; abdominal segment 0.6 mm; eye 

 tubercle 0.4 mm ; lateral process 0.6 nnn long. 



Types. — Holotype : A specimen collected near Caldron Rock, 

 Puget Sound, dredged from 70 meters, July 10, 1935, U.S.N.M. no. 

 71498. Paratypes: 2 specimens, 1 female and 1 probably immature, 

 dredged from rocky bottom in 50 meters off O'Neal Island. 



Retnarks. — Nymjylion turritum belongs to the group of Nymplion 

 that possesses auxiliary claws and in which the first tarsus is shorter 

 than the second. This group includes N. gracile, N. tridentatum, 

 and N. adareanwn. N. turntum most closely keys out to gracile 

 (Bouvier, 1913, p. 73) except that the third segment of the palpus is 

 a little longer than any other of the palpal segments. It is charac- 

 terized from other closely related forms by the very pointed eye 

 tubercle, elongated abdominal segment, spination of the legs and 

 single row of long spines underneath the second tarsus, short thick 

 hand with short fingers, and short and rather heavy neck. 



Genus AMMOTHEA Leach 



AMMOTHEA DISCOIDEA, new species 



Figure 33, e, f 



Description. — Body short, circular or disk-shaped, lateral proc- 

 esses contiguous throughout their length, anterior process very 

 slightly separated from cephalic segment, each tipped with a pair of 

 laterodorsal tubercles from apex of each of which usually arises a 

 short stiff bristle ; abdominal process long, slender, reaching at least 

 to distal end of first coxal segment of posterior legs or even farther. 



Proboscis long, heavy, over half as long as trunk, thickest in mid- 

 dle, tapering a little to anterior end, which is blunt, terminating in 

 mouth surrounded by three lips, one dorsomedian and two latero- 

 ventral. 



