298 REPORT 1868. 



appendages of antepenultimate segment triangular, with small setae on 

 the external margin towards the extremity. On Laminaria3, Hillswick. 

 Differing from P. dentatum chiefly in the form of the plate attached 

 to the antepenultimate segment, which in that species is as wide, or 

 even wider, at the extremity than at the hase, and denticulate, while 

 in P. subrotundum it is triangular, narrowing from the base to the ex- 

 tremity, and only furnished with small setas. It may he mentioned 

 that though the size of this plate in proportion to the other appendages 

 varies greatly according to age, the form is still preserved. 



Alteufha. bopyroides, Glaus, Die frei lehenden Copepoden, p. 143, pi. xxii. 

 figs. 10-17. Abundant in the drift-net, and by washing Laminaria3. 



-. purpurocincta, Norman Peltidium purpureum, White, Popular History 



of British Crustacea, p. 308, pi. xviii. fig. 4 (but not Peltidium pur- 

 pureum, Philippi). This fine species, which it is necessary to re-name, 

 is abundant on LaminariaB at Hillswick. 



Zaus spinosus, Gooclsir, Ann. Nat. Hist. vol. xvi. (1845) p. 326, pi. xi. 

 figs. 1-8 ; Glaus, Die frei lebend. Copep. p. 146, pi. xxii. fig. 5, and 

 pi. xxiii. figs. 1-10. Among weeds, tide-marks, Balta Sound. 



ASPIDISCTJS, n. g.* 



Body oval, depressed like that of Zaus. Upper antenna? 9-jointecl, second 

 and third joints long, last six short (in male third joint short, fourth, fifth, 

 sixth long). Lower antenna with the secondary branch slender. First feet 

 with the inner branch 3-jointed, the first large and very stout, second and 

 third very short, the last with two membranaceous appendages ; outer branch 

 not longer than basal joint of inner branch, 3-jointed, last joint furnished 

 with spines and setae. Last feet consisting of one falcate, 2-jointed branch. 

 Aspidiscus fasdatus, n. sp. Cephalothorax ovate, truncate behind ; sides of 

 segments produced backwards in curved points. Abdomen much nar- 

 rower than cephalothorax. Caudal lamina very small, caudal seta3 

 very long. Upper antennaj in female 9 -jointed, first joint short, second 

 longer, with numerous seta3 on anterior margin, third much longer than 

 second, with a tuft of seta3 at the distal extremity of anterior margin, 

 fourth half length of third, last five joints short ; in the male the third 

 joint is shorter than the second, fourth twice as long as third, fifth half 

 length of fourth, and shorter than sixth, last three short. First feet 

 having the inner branch with a very massive basal joint, which is hol- 

 lowed on the inner margin at the base, where there is a rounded lobe 

 attached to the peduncle ; beyond this excavation of the margin there is 

 a long seta, second and third joints very short, combined, not so long as 

 the curious appendages of the last, which consist of two Iacinia3 termi- 

 nating in membranaceous expansions, as in the genus Scutittidium (vide 

 Glaus, Die Copepoden-Fauna von Nizza, pi. iv. fig. 15) ; outer branch 

 3 -jointed," much more slender and not longer than the basal joint of 

 inner, the third joint furnished on the side with delicate spines, and at 

 the apex with seta3; basal joint with a plumose seta at the distal ex- 

 tremity of outer margin. Last feet 1 -branched, falcate, consisting of 

 two long joints ; the last slightly bilobed on the inner margin, ciliated, 

 rounded at the extremity, with only one short terminal seta. Colour 

 pale, with a ruby-coloured fascia on the second and third, or second, 

 third, and fourth segments of the cephalothorax. 



* 'A<r7riicrKos, a little shield. 



