546 ^^- Stephensen. 



54. Bopyroides hippolytes Kr. 



Bopyrus Hippolytes Krøyer, Grønlands Amfip., Kgl. Danske Vid. Selsk. 



math, naturvid. Af h., vol 7, 1838, р.ЗОб, PI. 4, fig.22. 



— — Krøyer, Voyage en Scand., Crust. 1846, PI. 28, lig. 2. 



Bopyroides acutimarginatus Stimpson, Proc. Acad. Nat. Sei. Philadelph., 



1864, p. 156. 

 * — hippolytes G. O. Sars, Account, vol 2, 1899, p. 199, 



PI. 84, fig. 2. 

 — — Richardson, Monograph Isop. N. -Am. 1905, 



p. 567, with figs. 



St. 18e. Hvalrosodden, 0—3 fm. 24—8—1905. Littoral and Laminaria 



region, soft bottom. 2 spec. 

 St. 27. Danmarks Havn, 10—15 fm. 29—9—1906. Delesseria region, 



soft bottom. 1 spec. 

 St. 35. Danmarks Havn, 5—8 fm. 11 — 10-1906. Delesseria and 



Laminaria region, hard bottom. 1 spec. 

 St. 48. Danmarks Havn. ca. 5 fm. 18—7—1907. Laminaria region. 



1 spec. 

 St. 49. Danmarks Havn, ca. 5 fm. 21—7 — 1907. Laminaria region, 



soft bottom. 1 spec. 

 St. 57 a. Danmarks Havn, 8—10 fm. 8 — 8—1907. Delesseria region, 



soft bottom. 1 spec. 

 St. 72. Stormbugt, 10—20 fm. 9—9—1907. Delesseria and Hydroid 



region, hard bottom. 1 spec. 

 St. 72 a. Stormbugt, 10—20 fm. 9—9—1907. Delesseria and Hydroid 



region, hard bottom. 2 spec. 

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



region, soft bottom. 5 spec. 

 St. 96. OtT Maroussia. 80—90 fm. 22—7—1908. Hydroid region, 



hard bottom. 1 spec. 

 All the specimens were found on Spirontocaris polaris. Two of 

 the hosts each had two parasites, 1 specimen on each side of the cara- 

 pace (St. 18e and St. 72a) ; in some the parasite was not present, but 

 as the carapace had the characteristic bulging on the one side, there 

 can be no doubt, that this was due to a Bopyrus, which must have 

 fallen out (St. 35, 48, 49, 57a, 72 and Danmarks Havn, end of July 

 1908, 2 spec). Similar formations may be due certainly to Copepods 

 of the family Choniostomatidae {Choniostoma mirabile H.J. Hansen: 

 Krebsdyr fra Kara-Havet, Dijmpha-Togtets zool.-bot. Udbytte, Køben- 

 havn 1887, p. 271, PI. 24, fig. 7 and H.J.Hansen: The Choniostoma- 

 tidae, a fam. of copepoda, parasites on Malacostraca, Copenhagen 

 1897), but as not a single specimen of Choniostoma was found, though 



