174 
REMARKS. What I described and figured in »Dijmphna-Togtet« as Ch. mirabile, 
were specimens of this species; besides, I was of the opinion that all my specimens on 
Hipp. Gaimardii, and an exceedingly large specimen on Hipp. polaris, belonged to the 
same species. Giard and Bonnier, in their paper of 1889, supposed that the large specimen 
detected on Hipp. polaris, was of another species, especially because it occurred on another 
species of host, and they named it Ch. Hanseni, but without material of course they could 
give no description. Their supposition proved right to a certain extent, as the parasite on 
Hipp. polaris did really belong to a species which differs from Ch. mirabile, but it became 
evident at the same time that Ch. Hansenti is found in Hipp. Gaimardii as well. After 
this discovery I examined in our Museum all the specimens kept of both species of Hippolyte, 
and in a very large material of Hipp. Gaimardii from the Kara Sea I succeeded in finding 
two more specimens infested with small parasites, one of which is the above-mentioned spe- 
cimen with larve and pup on its gills, whereas the parasites on the other specimen belong 
to Ch. Hansenii. 1 suppose the larvee and pup found to pertain to this species, because 
they occurred together with the small female (1°35 mm. in length), but L must point out that 
this proof is not quite decisive, as allowance must be made for the possibility that these 
larvee and pupe may belong to the following species, or some of them to Ch. mirabile, 
others to Ch. Hansenii. It is worth noticing that I have not been able to detect any 
difference between larvee taken out of the ovisacs of either species. 
Max Weber describes ovisacs taken in the branchial cavity of Hipp. Gaimardii 
from the part of the Murman Sea which is South of Nova Zemblia, and these ovisacs 
decidedly belong to this genus, but the species cannot be determined. — J. Sparre Schneider 
in: »Tromso Museums Aarshefter 14, 1891«, p. 112, says that be has found » Choniostoma 
mirabilis« on a specimen of Hipp. Gaimardii from Hillesé in the Malangen-Fjord (on p. 98 
he furthermore states that the same specimen was also infested with a Phryxus |Hemiarthrus 
abdominalis (Kr.)|), and that he had moreover observed it near Troms6; but it cannot be ascer- 
tained here either, whether it is Ch. mirabile, Ch. Hansenii, or both species, which have been seen. 
In a large specimen of Hipp. Gaimardii from the Davis Straits, lat. 66° 30° N., 
long 54° 50‘ W., forty fathoms, under a swelling of the carapace eight ovisacs occurred, 
and the foremost gills were reduced and contained two pups, but as the female was wanting, 
in this case also it is impossible to determine the species. However, we may state at once 
that not this species, but Ch. Hansenii was discovered later on at the coast of West-Greenland. 
2. Choniostoma Hansenii Giard and Bonnier (without description). 
(Pl. X, fig. 6a—6b; pl. XI, fig. 2a—2f,) 
Choniostoma Hansenii Giard and Bonnier, Bull. scient. de la France et de la Belgique T. XX, 1889, 
p. 366 [without description]. 
— — Giard and Bonnier, Bull. scient. de la Fr. et d.1. Belg. T. XXV, 1895, p. 479. 
