204 Part III. — Eleventh Annual Report 



not been observed in the Forth beyond the area referred to, while others 

 are not so restricted, and have been obtained in different localities — sea- 

 ward as well as inshore. 



Delavalia wmula* sp. n. (provisional name). (PI. IV. figs. 36-47.) 



Length, *73 mm. Similar in form to Delavalia reflexa, Brady and 

 Robertson. Anterior antennae of the female nearly as in Delavalia 

 rohusta, Brady and Robertson ; male anterior antennae nine-jointed, 

 hinged between the sixth and seventh joints ; a sensory filament springs 

 from the end of the fourth joint in both sexes, but that of the female is 

 shorter. The formula shows approximately the relative length of the 

 joints of the antennae in both male and female : — 



Female antennae, . 20 • 10 ■ 8 ■ 6 • 4 ■ 8 • 6 v4 ■ 



2 • 3 • 4 • 5 ' 6-7-8'9- 



Male antennae, . 24 • 11 • 5 ■ 13 • 5 ■ 10 ' 8 • 5 • 7 * 



Secondary branch of posterior antennae three-jointed, middle joint very 

 small. Basal joint of mandible palp — elongate — about three times longer 

 than broad ; the branches, which are subequal, are less than half the length 

 of the basal joint. Posterior foot-jaws nearly as in Delavalia rohusta, the 

 last joint short, narrow, and curved, and appearing to be merely a con- 

 tinuation of the base of the terminal claw (fig. 41). Both branches of 

 all the four pairs of swimming feet — except the inner branches of the 

 second pair in the male — three-jointed ; the inner branches of the first 

 pair are rather longer than the outer, and the first joint is about one 

 and a half times longer than the next one (fig. 42). The second 

 joint of the inner branch of the second pair in the male is nearly twice 

 the length of the first joint, and probably consists of two coalesced 

 joints, rather slender, and with the inner margin of the proximal half 

 strong, gibbous, and furnished with a plain, flexuous, terminal seta 

 fig. 43). Fifth pair in both sexes nearly as in Delavalia reflexa, except 

 that the basal joint carries one very small and four elongate stout plumose 

 setae, and the outer joint six plain setae. Caudal stylets about equal in 

 length to the last abdominal segment. The inner of the two principal 

 caudal setae very long, equal to the combined length of the abdomen and 

 caudal stylets. 



Habitat. — Largo Bay. Not rare. 



Delavalia cemula differs especially in the inner branches of the first 

 pair of swimming feet being three-jointed, and seems otherwise to com- 

 bine characters belonging to all the other three British genera. 



Genus Gletodes, Brady (1872). 



(1) Gletodes tenuiremis, sp. n. (provisional name). (PI. III. figs. 21-28.) 



Animal resembling Gletodes linearis (Claus). Length, *96 mm. An- 

 terior antennae seven-jointed, basal points robust ; all the joints, with the 

 exception of the first, subequal in length. The approximate length of the 

 joints are shown by the formula — 



14-8-7-7-5-5-6- 



1-2-3-4-5-6-7 



Secondary branch of posterior antennae small, uniarticulate, and bearing 

 two short terminal setae. Mandible palp consisting of a small one-jointed 

 branch (fig. 24). The first pair of swimming feet have the inuer branches 



s&mulus, an imitator. 



