206 Part 111. — Eleventh Annual Report 



minute lateral setae. The anterior antennae are short and seven-jointed 

 (fig. 8). The formula shows the relative length of the joints : — 



10' • 12 • 10 • 10 • 8 • 5 • 7 ' 



1 • 2 • 3 • 4 -5 -6 '-7 • 



The inner branch of the posterior antennae is two-jointed (fig. 10). The 

 mandibles are well developed ; apex of biting part broad, truncate, and 

 armed with a row of stout blunt-pointed teeth, and a marginal divergent 

 seta ; there is also a stout tooth, larger than the others, arising from the 

 lateral distal aspect of the mandible. Posterior foot-jaws stout, with a 

 long slender terminal claw ; the inner margin of the second joint has an 

 intermediate fringe of cilia, and two small setae near the distal end ; a pro- 

 minent setose spine springs from the inner distal angle of the first joint, and 

 immediately behind the seta is a transverse row of small hairs. The first 

 pair of swimming feet, which somewhat resemble those of Dactylopus 

 jiavus, differ in the spines on the exterior distal angles of the first and 

 second joints of the outer branches being not larger than the marginal 

 spine of the third joint, and in the apical setae of the third joint being 

 non-geniculate ; the outer margins of all the three joints are strongly 

 setiferous ; the inner branch, which has also the outer margin of all the 

 joints fringed with small setae, is armed with a stout, moderately long, 

 and straight terminal spine and two setae (fig. 14). The inner branches 

 of the second pair in the male terminate in a stout, slightly curved, conical 

 spine as long as the third joint (fig. 15). The fourth pair resemble those 

 of Dactylopus jiavus, but the outer margins of both branches are setiferous, 

 and the elongate setae on the inner margins are plumose (fig. 16). The 

 inner segment of the basal joint of the fifth pair is slightly produced and 

 rounded, and provided with four marginal setae, one being greatly 

 elongate ; the secondary joint is short, obliquely truncate at the end, and 

 furnished with four unequal terminal setae ; fifth pair in the male smaller, 

 the inner portion of the basal joint less produced, and armed with two 

 spine-like setae of unequal length, the longer one being plumose (fig. 18). 

 Abdominal segments strongly ciliate. Caudal stylets short and stout ; 

 the inner one of the two caudal setae much longer than the other, and 

 equal to half the length of the entire animal. Spermatophore broadly 

 ovate (fig. 20). 



Several specimens of this species were obtained by washing some shells 

 inhabited by Pagurus bernhardus, and collected west of Inchkeith. The 

 copepods may only have been accidentally harbouring about the shells; 

 they have scarcely the appearance of 'commensals' or 'messmates.' 



Family Saphirinid^:, Thorell. 



Genus Lichomolgus. 



Lichomolgus hirsutipes, sp. n. (provisional name). (PI. IV. figs. 1-12.) 



Length 1*4 mm. (ygth of an inch). Seen from above, the first four 

 segments of the cephalo-thorax are together broadly ovate, the first seg- 

 ment has a shield-like form, the fifth segment is narrow, and the proximal 

 rather narrower than the distal end. Anterior antennae seven-jointed. 

 The relative length of the joints is shown by the formula — 



19 • 44 -8 -19 • 20 • 15 ' 11' 



6 • 7 • 



Posterior antennae four-jointed, third joint short, last joint bearing 

 two stout and hooked terminal claws. Mandibles nearly as in Licho- 



