CRUSTACEA COPEPODA. II. 43 
only very similar in general aspect, but their thickness and curvature make a thorough examination of most 
of their appendages very difficult; it will be no easy task for a future carcinologist to have the appendages 
arranged so that the same pair in different species can be seen and drawn nearly exactly from the same side, 
but that it necessary for a real comparison, for pointing out specific characters. Some few remarks on males 
may be given here. 
I have examined males of C. cornutus, C. Lophi, C. nodosus, and C. vadiatus. In the last-named 
form the two pairs of thoracic appendages are very distinctly biramous (Pl. III, fig. 6 d) and larger than in 
the other species; their sympod is very oblong, the exopod more than half as long as the sympod, and the 
endopod considerably shorter and thinner than the exopod. In males of C. Lop/ii the first pair of legs is 
scarcely larger than the second, the sympod is robust, the exopod terminal, extremely small in the first and 
somewhat larger in the second pair, while in both pairs a rudimentary endopod exists on the inner side of the 
sympod somewhat before its end. In C. cornutus the first pair of legs is conspicuously larger than the second, 
and both are seemingly unramified, consisting of an oval sympod terminating in two or three strong setee. 
In a male of C. nodosus I found these two pairs of legs considerably smaller than in the other forms; first 
pair a little shorter than second, and both pairs simple, as in C. coynutus. — Specific differences are also to be 
found in second joint of the maxillipeds which is distinctly produced into a protuberance below the insertion 
of third joint, but in C. vadiatus (fig. 6 b) considerably more produced than in the three other species. The 
caudal rami are also much longer in C. vadiatus (fig. 6 e) than in the other forms mentioned. 
53. Chondracanthus cornutus O. F. Mill. 
1776. Lernea cornuta O. F. Miller, Zool. Danicee Prodromus, p. 227. 
1777—79.-  — — O.F. Miller, Zool. Danica, I, p. 40, Tab. X XXIII, fig. 6. 
11863. Chondracanthus cornutus Kroyer, Naturh. Tidsskr. 3. Rekke, B. II, p. 323, 329, Tab. XIII, fig. 
7, a—d. 
! — ~- Flure Kroyer, ibid. p. 323, 330, Tab. XIII, fig. 6, a—b. 
11913. — cornutus T. & A. Scott, Brit. Paras. Cop. p. 168, Pl. XLVII, figs. 1, 2; Pl. LII, 
fig. 5; Pl. LIII, figs. r—9 [with synonymy]. 
— = fluve T. & A. Scott, ibid. p. 171, Pl. XLVII, fig. 5; Pl. LIII, figs. r1o—11. 
It is seen that in spite of Kroyer and T. & A. Scott, I find it necessary to cancel C. flure Kr. asa 
separate species. The English authors quoted say that C. cornutus lives on Pleuronectes platessa, and C. flure 
has only been found on Drepanopsetta platessoides. On the gills of the last-named fish Mag. sc. W. Lundbeck 
took 11 females in Onundarfjord (Iceland) ; they vary considerably in shape, showing every transition between 
the long and narrow typical C. cornutus to the rather broad C. flure with the two thoracic segments subequal 
in length and sharply marked off, though even the broadest specimen is a little longer and less broad than 
Kroyer’s types. And the same zoologist found in Pleur. platessa captured in the same fjord a female (with 
ovisacs) which is very broad and short with the thoracic segments well marked off, a typical C. flure. Spec- 
imens taken by the “Ingolf’”’ on Pleur. platessa in Seydisfjord differ also much in outline; one among them 
agrees with Kroéyer’s figure of C. flurg, another nearly with his figure of C. cornutus. At West Greenland, 
6* 
