REPORT OF COMMISSIONERS OF INLAND FISHERIES. 77 



Large, long female, (1.3 mm. male 1.9 mm. without caudal setae), 

 of transparent grayish or pinkish color. Body tapers regularly from 

 the cephalic segment. 



Female. — Three free thoracic segments of equal width and rounded 

 at the sides. Abdomen 5-jointed, relative length of joints and furca 

 4 — ^—7 — \ — n~^- Furca six times as long as broad, with six setae; 

 one on outer edge nearer the proximal than the distal end of furca, 

 a minute dorsal bristle, and four terminal setse, inner and outer 

 minute, 2nd twice the length of furca, 3rd one-half the length 

 of furca. The lower portion of posterior edges of the abdominal joints 

 and the lower surface of the furca fringed with heavy short spines. 

 First antenna 6-jointed, a little more than one-half the length of 

 head segment, beset with short bristles, relative length of joints 

 jfi l^ ^ — 5— ^— tt- Second antenna 4-jointed, 1st joint long and 

 directed forward and inward, 2nd and 3rd short, 4th slightly longer 

 and armed below with heavy triangular spines, with two heavy 

 terminal claws and three heavy terminal setae. Labrum ending in 

 an acute, backwardly directed spine. Mandible with an apparently 

 movable terminal claw which has at base a hemispherical pad beset 

 with recurved bristles. First maxilla with a single shoe-shaped joint 

 from whose tip arises one long and two short bristles; lower surface 

 with a similar trio of bristles. Second maxilla 2-jointed basal joint 

 swollen, terminal joint heavy, straight, spine-like, with one bristle 

 midway upon its posterior edge. Maxilliped absent (?). 



First to 4th swimming feet with both rami 3-jointed. ^lany of 

 the bristles and spines of the legs are irregularly swollen or con- 

 stricted. The sternite between each pair of legs forms a ridge which 

 is shaped like half of a dumb-bell and has several heavy, flat, spines 

 on each rounded projection. The spines of all legs are entire. Distal 

 joint of basipodite of 1st leg with a broad spine upon its internal 

 angle. The edges of both rami and of the basipodite as well as the 

 distal edge of the 2nd joint of the basipodite are fringed with heavy, 

 triangular, acute spines. Fourth foot does not differ from the others. 

 Fifth foot 2-jointed, 1st joint short with a single bristle upon a slight 



