104 
Synopsis of the species (tbe genera are in clironological order). 
1. Dajus Mysidis Krøyer, in Gaimard, Yoyage en Scand., Crust. 1846 
(1849?), PI. 28, fig. 1—2, PI. 29, fig. 1. * 
* — — G. O. Sars, Account vol. 2, Isopoda 1900, PI. 228, 
PI. 98—94. 
— Riehardson, Monograph of Isop. N. Am., Buli. U. S. 
Nat. Mus. No. 54, 1905, p. 573 (ubi litt.), fig. 638. 
In tbe marsupium of Mysis oculata or M.mixta; 
arctic, lengtb 4 mm. 
2. Dajus Siriellæ G. O. Sars, Cballenger Report, Zool. vol. 13, 1885, 
Scbizop., p. 220—21, PI. 88, fig. 12—14. »Attacbed to tbe 
ventral face of tbe trunk posteriorly on a few specimens of 
Siriella Thomsoni Milne Edwards, botb males and females, 
in tbe latter lving partly witbin tbe marsupial poucb, as was 
also tbe case witli Dajus Mysidis. “ 
3. Aspidophryxus peltatus G. O. Sars, Oversigt af Norges Crust. 1, Vid. 
Selsk. Forhandl., Christiania 1882, p. 72, PI. 
2, fig. 12-15. 
— — G. O. Sars, Account vol. 2, Isop. 1900, p. 228. 
PI. 96. 
Tattersall, Fisheries, Ireland, Sci. Invest. 
1904, pt. 1 (1905), p. 76, 82. 
Nordisches Plankton, vol. 6, 1911 
(Lief. 14), p. 244, fig. 139—44, 
p. 290, fig. 283—87. 
Sarsii Giard & Bonnier, Epicarides de la fam. des Dajidæ. 
Buli. Scient. France et Belgique, 1889, p. 266. 
Lengtb 3 mm. On tbe carapace of Erythrops or (seldom) 
Mysidopsis didelphys or Parerytlirops obesa. Norway (Sars), 
Scotland (Scott), Ireland (Tattersall). Dr. Tb. Mortensen bas 
taken the species on Erythrops {pygmæa?), Kristineberg 
zool. St. (Gulmarljord, Bohuslan), 60 m., 11—1—1910. 
4. Aspidophryxus frontalis Bonnier, inKoehler: Isop. nouveaux de la fam. 
des Dajides. Buli. Inst Océanogr. No. 196, Monaco 1911, 
p. 2—10, fig. 1—7. — Tbe larva: Tattersall: Nordisches Plank¬ 
ton, vol. 6, 1911 (Lief. 14.), p. 291, fig. 288—93. 
Lengtb 1,4 m. On rostrum of Siriella norvegica, 34° N, 
8° 10' AV, surface. 
5. Notophryxus ovoides G. O. Sars, Oversigt af Norges Crust. I, Vid. 
Selsk. Forh., Christiania, 1882, p. 71, PI. 2, fig. 
9—11. 
— — G. O. Sars, Account vol. 2, Isop. 1900, p. 226, PI. 95. 
— — Tattersall, Nordisches Plankton, vol. 6 (Lief. 14), 
1911, p. 252, fig. 156—61, p. 266, fig. 192. 
Lengtb 3,5 mm., on tbe abdomen of Amblyops abbreviata , Norway. 
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