CRUSTACEA COPEPODA. II. 59 
to Clavella sens. Wilson; but they do not agree well with any of his new genera. Instead of establishing any 
new genus I prefer in the present paper to keep all 5 species in the old genus Clavella, without thereby in- 
dicating any positive criticism of Wilson’s grouping. I am, however, apt to think that the study of a very 
large number of females and males of described and undescribed species may show that it will be very diffi- 
cult to subdivide Clavella sens. Scott into several natural and sharply defined genera. 
75. Clavella uncinata O. F. Mill. . 
(Pl. IV, figs. 4 a—4 1). 
1776. Lernea  uncinata O. F. Miller, Zool. Daniczee Prodromus, p. 226. 
1777—79. _. — O7 Fs Miuiller, Zool. Danica, 1; p: 38, Dab: XXCXiIl) fig. 2: 
1837. Anchorella — Kroyer, Nat. Tidsskr. B.I, p. 290, Tab. III, fig. 8, a—f. 
1863. --- ~ Kroyer, Nat. Tidsskr. 3. Rekke, B. II, p. 384. 
! — — agilis Kroyer, op. cit. p. 374, 384, Tab. XVI, fig. 2, a—b. 
1913. Clavella uncinata T. & A. Scott, Brit. Paras. Cop. p. 214, Pl. LXV, figs. 2, 3, 6; Pl. LXVI, 
figs. 2I—23. 
!TQI5. — — Wilson, Proc. U.S. Nat. Mus. Vol. 47, p. 680, Pl. 27, fig. M.; Pl. 48, figs. 
167—173; Pl. 40, figs. 174—176. 
T. & A. Scott say: “Abdomen small but quite distinct’’; Wilson states (p. 681) “genital process... 
minute’; and the protuberance interpreted as “genital process’’ by Wilson has been named “abdomen” 
by probably all earlier authors. Kroyer writes (1863) on his A. wncinata: “abdomen sat magnum, quartam 
fere longitudinis annuli genitali partem attingens, longius quam latius’’, and on his A. agilis: “abdomen 
minutum, haud longius quam latius, obtuse conicum’’. Judging from these statements one might suppose 
that C. agilis Kr. is sharply defined from A. wncinata auct., and that the animals described by Scott and 
Wilson as C. uncinata in reality belong to C. agilis. The inspection of my rich material enumerated below 
showed that all specimens taken on the branchiz or in the mouth of various Gadide at Iceland and West 
Greenland have a rather large or large genital process, which, however, is not always longer than broad. 
But on a branchia of Gadus saida ep. (= G. agilis Reinh., Kroyer) from East Greenland 11 specimens are 
found, 4 among them with ovisacs, the others smaller or only half-grown, but the genital process varies 
considerably in size, from moderately large to somewhat small. In specimens taken on dorsal, pectoral or 
ventral fins of Gadus callarias and G. ogac at three places in West Greenland the genital process is small 
or moderately small, shorter or much shorter than broad. In specimens taken at West Greenland but without 
statements whether found on gills or fins, the genital process varies much in size and in length in proportion 
to breadth, and that even in animals preserved in the same tube and probably taken together. To refer the 
specimens seen to two different species according to size and shape of the genital process I found to be im- 
possible. 
The front margin of the head is transverse, nearly straight or slightly concave. — The antennule 
ate indistinctly 3-jointed, terminating in 3 moderately long and 1 or 2 short and thick spines; first joint 
is very thick and nearly as long as the two distal joints together. — The antenne are nearly parallel with 
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