24 CRUSTACEA COPEPODA. II. 
Occurrence. — Not secured by the “Ingolf’, but by Mag.sc. R. Horring, June 18, 1906. 
Feeroes: Vestmanhavn; 2 females in Phallusia obliqua. 
Distribution. — Norway, “within the branchial cavity of different kinds of Ascidians, most fre- 
quently in Phallusia obliqua (G. O. Sars). Bohuslan, in Phallusia mentula and P. aspersa (Thorell). 
Blakeanus Wilson. 
Of this genus, established by C. B. Wilson in 1rg21, a species considered as new has been found in 
our area. 
28. Blakeanus groenlandicus n. sp. 
(Pl. II, figs. 8 a—8d; Pl. III, figs. 1 a—z h.) 
Female. — The body, excepting the abdomen, very thick and dorsally extremely inflated (fig. I a), 
highest above fourth thoracic legs and not divided into segments. Abdomen consists of five distinct segments; 
the caudal rami (fig. rh) are thick, and each with 4 terminal, more or less curved and hook-shaped, robust 
spines, the upper one nearly twice as long as the others. 
Antennule (fig. 1b) rather similar to those in Botryllophilus macropus Canu; first joint is much 
broader than long, along the distal margin with 6 very long and robust setee, and a little from the inner end 
a protuberance with 3 strong sete very different in length, finally at the outer angle a spiniform seta not 
half as long as the others; the remainder of the antennula consists of three joints. — Antenne (fig. 8a) slender; 
the terminal joint has 2 lateral sete, 3 terminal setee, and above at the end a minute spine; near to this spine 
an oblique comb of minute spines is observed. — Mandibles (fig. 1 c) in the main as in B. macropus; the distal 
third of the cutting edge (fig. 1d) with 7 more or less spiniform processes very different in size, while the 
proximal two-thirds of the edge is a most elegant comb of innumerable, very slender spines; the broad palp 
is curved two times in opposite directions and exhibits no articulations, but both the endopod and the exopod 
has respectively 5 and 4 robust or extremely robust terminal setae. — Maxillulee (fig. 8 b), maxille (fig. 8 c) 
and maxillipeds (fig. 8d) show on the whole close relationsship to Botryll. macropus; special description is 
scarcely needed. — The four anterior pairs of legs increase in length from first (fig. I e) to fourth pair (fig. 1 f); 
the sympod is thick; the endopod is short, two-jointed, with first joint very short and second joint with 
respectively 5 and 4 terminal setee; the exopod, which is scarcely distinctly jointed, is twice, or considerably 
more than twice, as long as the endopod, on first pair with 5 strong setze on the end and along one margin, 
while on fourth pair only a strong, terminal, spiniform seta and 4 quite small spiniform sete (fig. I g) — 
Fifth legs (fig. Ia) very different from those in Botryllophilus, but similar to those in Blakeanus corniger 
Wils., as the proximal part is much thickened, the distal part slender and much curved, with a minute hair 
at the end. 
Length 4.1 mm. 
Remarks. — The present species is so similar to Wilson’s figure of his Blakeanus corniger (described 
in 1921 from a specimen taken “from an Ascidian, “Cynthia carnea’’, in Long Island Sound’’) that I should 
have considered the forms as identical, if Wilson had not stated on the caudal rami that “they are entirely 
