Report on the Malacostraca, Pycnogonida and some Entomostraca. 547 



several of Bopyroides, the formations must be due to the latter. One 

 of the prawns (from St. 49) was remarkable in having eggs, though 

 the parasites otherwise usually give their hosts the appearance of 

 the opposite sex, whilst castrating them (Giard: Castration parasitaire. 

 Bull, scient. France et Belgique, 1888). The fact that this individual 

 nevertheless bears eggs, thus indicates, that the sexual organs may 

 again come into function if the parasite falls off (the prawn in ques- 

 tion was one of those, in which the parasite had merely left its 

 mark in the bulging of the carapace). 



55. Dajus Mysidis Kr. 



Dajus Mysidis Krøyer, Voyage en Scand., Crust., 1846, PI. 28, 



fig. 1. 

 Leptophryxus Mysidis Buchholz, Zweite deutsche Nordpolarf., vol 2, 



Crust., 1874, p. 288, PI. 2, fig. 2. 

 *Dajus Mysidis G. O. Sars, Account, vol 2, 1899, p. 223, PI. 93—94. 



— Richardson,MonographIsop. N.-Am.,1905, p.ö73, 



with figs. 



St. 20a. Danmarks Havn, 5 — 10 fm. 19—9 — 1906. Delesseria region, 



soft and hard bottom. 1 spec. 

 St. 23. Danmarks Havn, 0-5fm. 22-9—1906. Littoral region, sand 



and mud with algæ and gravel. 2 spec. 

 St. 48. Danmarks Havn, 4 — 6 fm. 18—7 — 1907. Laminaria region, 



soft bottom. 1 spec. 

 St. 56. Danmarks Havn, 5 — 8 fm. 28 — 7 — 1907. Boundary between 



Laminaria and Delesseria region. 3 spec. 

 St. 57. Danmarks Havn, 8-10 fm. 8—8—1907. 3 spec. 

 St. 59b. Danmarks Havn, 3 — 8 fm. 14—8—1907. Boundary between 



Laminaria and Delesseria region. 10 spec. 

 St. 59b. Danmarks Havn, 5 — 8 fm. 14 — 8 — 1907. Laminaria and De- 

 lesseria region, soft bottom. 1 spec, 

 number) Danmarks Havn, 25—9—1907. 2 spec. 



„ Danmarks Havn, 5 — 10 fm. End of July 1908. Delesseria 



region, soft bottom. 2 spec. 

 All are attached to Mysis oculata. In spite of very careful search, 

 I have not succeeded in determining how the animal is attached. 



56. Cryptocope arctica H. J. Hansen. 

 *Cryptocope arctica H. J. Hansen, Krebsdyr fra Kara-Havet, Dijmphna- 

 Togtets zool.-botan. Udbytte, 1887, p. 209, PI. 21, 

 fig. 4. 



