Kroyer established his L. rvobustws on a couple of specimens taken on a Raja from West Greenland, 
and he described them as males. Wilson accepts L. vobustus, gives a rearranged translation of Kréyer’s descrip- 
tion, and adds that it “seems fairly well characterized by the skin protuberances on the genital segment and 
by the bipartite furca”’ (p. 647). I have examined Kréyer’s types and besides looked over a good number of 
immature specimens of Lepeophtheirus Hippoglossi taken together with a multitude of adult specimens of both 
sexes. The result is that L. vobustus has not been established on males but on young specimens of L. Hippo- 
glosst. The bipartite furca is well known as one of the good characters for the last-named species. Fig. 4 b 
represents the posterior part of the body of a very young L. Hipfpoglossi, 5 mm. long (caudal rami included), 
and fig. 4 a the same part of a specimen 8 mm. long. Both figures show that the lateral part of the genital 
segment is produced backwards into a triangular protuberance about as long as broad and equipped with 
4 setee; T. & A. Scott have already drawn an immature female (Pl. XVII, fig. 2) showing the same shape 
of the genital segment, nearly as in my fig. 4 a). In an older, immature specimen, 11 mm. long, these pro- 
tuberances are much shorter, much broader than long and distally broadly rounded with a single minute 
seta. Furthermore my fig. 4 a exhibits the curious skin-lappets at the base of the genital segment, on each 
side two lappets, the anterior one partly overlapping the other; in the youngest specimen (fig. 4 b) the posterior 
lappet is proportionately a little larger and especially thicker and more developed as a protuberance, while 
the anterior lappet is a small branch of the other. In this young stage the protuberances look as if they were 
the lateral part of an otherwise not defined segment intercalated between the segment bearing the fourth pair 
of legs and the genital segment. In the above-named specimen 11 mm. long the lappets have disappeared 
completely. 
Occurrence. — Not taken by the “Ingolf”’. 
At West Greenland L. Hippoglossi seems to be more common than any other among the parasitic 
Copepoda; it is generally found on Hippoglossus vulgaris and Hipp. pinguis, but has also been taken on Raja 
sp. (Kroyer). It has been taken many times along the coast from near Ritenbenk, at Lat. 69°44’ N., south- 
wards to Holstensborg, at Lat. 66°56’ N., thus at Godhavn, at Egedesminde, etc.; no specimens taken at any 
place between Holstensborg and Cape Farewell are to hand, but as several tubes with animals marked Green- 
land without special locality are preserved in the Copenhagen Museum, some among the parasites may origi- 
nate from places in that more southern coast. — At East Greenland it has not been discovered. 
At Iceland the present species has been captured rather frequently, but in several cases no special 
locality has been noted; it was found on both species of Hippoglossus, besides on Sommiosus mucrocephalus ; 
Hallas (1867) found it even on the retina of that shark. At North-West Iceland it was gathered in Adalvik 
and Onundarfjord (Mag. sc. W. Iundbeck), furthermore at Lat. 66°10’ N., Long. 24°42’ W., 98 m., on the 
blind side of Hippoglossus vulgaris, 1 female (Dr. Joh. Schmidt). South of Ireland, at Lat. 63°05’ N., Long. 
20°00’ W., 920 m., a female was taken on the side of Centrophorus squamosus (Dr. Joh. Schmidt). 
At the Feroes L. Hippoglossi has been found several times by various collectors; somewhat east of 
these islands, at Lat. 62°30’ N., Long. 5°10’ W., 249 fath., numerous specimens were taken on Hzifpogl. 
vulgaris (Cand. mag. Ad. Jensen). 
Distribution. — Various places in Great Britain from Shetland to Cornwall (various authors) ; 
