of the Fishery Board for Scotland. 241 



branches of the next three pairs are somewhat longer than the inner 

 branches, and both branches are elongate, and moderately stout. In 

 the fourth pair the first two joints of the outer branches are sub-equal, but 

 the last is nearly equal to twice the length of the preceding one ; the joints 

 of the inner branches are each somewhat longer than the one preceding, 

 so that the last is fully twice the length of the first. Both branches have 

 the outer margin more or less ciliated, the marginal and terminal setae are 

 nearly all elongate and strongly plumose, and the marginal spines of the 

 outer branches are slender (fig. 26). The basal joint of the fifth pair is 

 broadly foliacous, the apical portion of which is sub-triangular and 

 furnished with six setae round the inner margin and end, the third one 

 from the outside being very long. The secondary branch is comparatively 

 small, oblong-ovate in form, and extends somewhat beyond the end of 

 the basal joint. There are several setae round the outer margin and apex 

 (fig. 27). Caudal stylets short, being rather more than half the length 

 of the last adominal segment. The principal terminal seta of each stylet 

 is nearly twice the length of the second (fig. 28). 



Habitat. — Off Musselburgh, Firth of Forth. Bather scarce. 



Remarks. — In the structure of the anterior antennae, and of the first 

 and fifth pairs of thoracic feet, this species differs from any others known 

 to me. .Neither the anterior antennae nor the first swimming-feet are those 

 of the typical Ameira. The end joint of the inner branches of the first 

 pair is, in Ameira, usually shorter than the basal joint, but in the 

 species now described the reverse is the case ; but otherwise there is 

 nothing to distinguish it generically from Ameira. 



Ameira longiremis, sp. n. (PI. V. figs. 29-32 ; PI. VI. figs. 1-5.) 



Description. — Female. Body elongate, robust. Length, "74 mm. 

 (^-th of an inch). Anterior antennae short, stout, eight-jointed. The first 

 to the fifth joints gradually decrease in length, the fifth and sixth are 

 about equal, while the sixth to the eighth gradually increase in length ; 

 the fourth bears a long and moderately stout sensory filament. The 

 annexed formula shows the proportional lengths of all the joints : — 



16 • 14 • 11 • 7 • 6 - 6 • 8 • 10- 

 ~1 '2 • 3 • ~4 • 5 • 6 • 7 ' 8 r 



Posterior antennae comparatively large, two-jointed. Secondary branch 

 small, one-jointed, and attached to the middle of the basal joint of the 

 primary branch. The mandible-palp consists of a comparatively large 

 basal joint, with a much smaller secondary one at its apex. The secondary 

 joint bears one marginal and a few apical setae. Posterior foot-jaws 

 stout, the second joint somewhat gibbous below, and armed with a 

 comparatively long terminal claw (fig. 30, pi. V.). The first pair of 

 swimming-feet somewhat similar to those of Ameira rerfexa, but much 

 stouter and more elongate. In the fourth pair the inner branches are 

 proportionally much shorter than in that species, as they scarcely reach to 

 the end of the second joint of the outer branches. The first joint is very 

 short, while the second and third are each rather longer than the 

 preceding one. The armature of the fourth pair is different from that of 

 the fourth pair in Ameira refiexa (tig. 5, pi. VI.). In the fifth pair the 

 basal joint is broadly triangular, and bears two stout spiniform setae on 

 the distal half of the inner margin, and two apical setae ; one of them 

 small, the other very long, plumose, and spiniform. The secondary branch 

 is elongate, narrow, cylindrical, being nearly five times longer than 

 broad. Both margins are more or less ciliate. The apex is obliquely 

 truncate, and bears several setae (fig. 31, pi. V.). Caudal stylets very 

 short. 



