298 REPORT—1868. 
appendages of antepenultimate segment triangular, with small sete on 
the external margin towards the extremity. On Laminarie, 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 base, and denticulate; while 
in P. subrotundum it is triangular, narrowing from the base to the ex- 
tremity, and only furnished with small sete. It may be mentioned 
that though the size of this plate in proportion to the other appendages 
varies greatly according to age, the form is still preserved. 
Alteutha bopyroides, Claus, Die frei lebenden Copepoden, p. 143, pl. xxii. 
figs. 10-17. Abundant in the drift-net, and by washing Laminarie. 
—— purpurocincta, Norman= Peltidium purpureum, White, Popular History 
of British Crustacea, p. 308, pl. xvii. fig. 4 (but not Peltidium pur- 
pureum, Philippi). This fine species, which it is necessary to re-name, 
is abundant on Laminarie at Hillswick. 
Zaus spinosus, Goodsir, Ann. Nat. Hist. vol. xvi. (1845) p. 326, pl. xi. 
figs. 1-8; Claus, Die frei lebend. Copep. p. 146, pl. xxii. fig. 5, and 
pl. xxii. figs. 1-10. Among weeds, tide-marks, Balta Sound. 
AsPIpIscts, n. g.* 
Body oval, depressed like that of Zaus. Upper antenne 9-jointed, second 
and third joints long, last six short (in male third joint short, fourth, fifth, 
sixth long). Lower antennze 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 sete. Last feet consisting of one falcate, 2-jointed branch. 
Aspidiscus fasciatus, n. sp. Cephalothorax ovate, truncate behind; sides of 
segments produced backwards in curved points. Abdomen much nar- 
rower than cephalothorax. Caudal lamin very small, caudal sete 
very long. Upper antennz in female 9-jointed, first joint short, second 
longer, with numerous sets on anterior margin, third much longer than 
second, with a tuft of sete 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 lacinie termi- 
nating in membranaceous expansions, as in the genus Scutillidium (vide 
Claus, Die Copepoden-Fauna yon Nizza, pl. iv. fig. 15); outer branch 
3-jointed, much more slender and not longer than the basal joit of 
inner, the third joint furnished on the side with delicate spines, and at 
the apex with sete; basal joint with a plumose seta at the distal ex- 
tremity of outer margin. Last feet 1-branched, faleate, 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. 
* ’Aomwiokos, a little shield. 
