of the Fishery Board for Scotland. 247 



sixteen-jointed ; basal joint large and furnished with three elongate, stout,, 

 marginal sensory filaments and several small setae ; the second, sixth, tenth, 

 and last joints are each also provided with a sensory filament, but smaller 

 thau those of the basal joint. The proportional length of the joints are 

 very nearly as shown by the annexed formula 



60-6-3 -- 3 • 3 • 3 • 4 • 4 • 4 • 4 ° 4 ' 4 ° 6- 8 • 6 • 6 

 1 • 2 • 3 • 4 • 5 ' 6 " 7 • 8 ' 9 ' 10 ' 11 ' 12 • 13 • 14 ' 15 • 16 



Posterior antennae three-jointed, the middle joint elongate with two small 

 setae on the exterior margin, and the last joint with a number of apical 

 setae. Secondary branch large, five-jointed, but shorter than the primary 

 branch, the third and fourth joints very small. Mandibles small, consist- 

 ing of a broad biting part, and a two-branched palp — one of the branches 

 being two-, the other three-jointed. Anterior foot-jaw small, four-jointed, 

 with several marginal setiferous processes. The basal joint of the posterior 

 foot-jaw elongate, the lower distal angle produced, with a blunt tooth-like 

 process ; second joint also elongate, slender ; the last four joints small and 

 setiferous. The outer branch of the first pair of swimming feet three- 

 jointed, each joint armed with a stout spine at the outer distal angle, the 

 inner branch one-jointed and rather longer than the first joint of the outer 

 branch. . The outer branch of the second pair is also three-jointed. Each 

 of the first and second joints bear one, and the last joint four, stout 

 spines of variable length, that of the second joint and the terminal spine 

 of the last joint being larger than the others ; the inner branch is two- 

 jointed and shorter than the outer one, and the first joint is rather smaller 

 than the second. The third and fourth pairs have both branches three- 

 jointed. A stout and nearly straight spine — longer than the inner branch — 

 springs from the inner distal angle of the first basal joint of the third 

 pair, otherwise the third and fourth pairs are similar. The fifth pair in 

 the female is one-branched, two-jointed, the first joint short and somewhat 

 dilated; the extremity of the second is produced into two elongate spini- 

 form processes (these are not spines articulated to the end of the joint but 

 are prolongations of it), the inner one much longer than the other; there 

 is also a subapical spine exterior to the two processes and shorter than 

 either.. Fifth pair in the male also one-branched, four-jointed, and elongate ; 

 that of the left (?) very slender. -The first joint of the right (?) foot is 

 short and dilated, the second and third long, the last very small and 

 furnished with a marginal hooklet and a subapical digitiform process. 

 Caudal stylets short, each bearing four long, plumose, terminal setae, the 

 two middle ones being stout and spiniform. Spermatophore elongate, 

 narrow, curved, and showing under the microscope a beautifully reti- 

 culated structure (fig. 29). 



Habitat. — OS St Monans, Firth of Forth. Several specimens were 

 obtained. . r 



Pseudocyclopia minor, n. sp. (provisional name). (PI. VIII. figs. 1-10). 



Length, exclusive of caudal setae, "43 mm. Cephalothorax robust, four- 

 jointed, first segment large, more than twice the combined lengths of the 

 other three. Anterior antennae short, setiferous, seven teen-jointed, the 

 basal joint large, provided with a hook-like spine on the outer margin and 

 near the middle of the joint, and with a sensory filament at the outer 

 distal angle ; the fourth, seventh, ninth, and thirteenth joints are also each 

 furnished with a small sense-organ. The proportional length of the joints 

 are very nearly as shown in the annexed formula 



30-2-2-2-2-2-3-3-3- 3' 3" 2 • 2 • 3' 4" 3" 3 

 1 • 2 • 3 • 4 • 5 6 • 7 * 8 ' 9 • 10 • 11 • 12 • 13 • 14 • 15 • 16 • 17 ' 



