199 
body and rounded forehead when seen from the side, and by the rather swollen middle joint 
of the second pair of maxillipedes. 
Two species were represented in the plankton collected by the ‘Siboga’ in the Malay 
Archipelago. 
1. Microsetella norvegica (Boeck). 
Setella norvegica Boeck, 1864, p. 281. 
Microsetella atlanticum Brady & Robertson, 1873, p. 130, pl. IX, figs. 11—16. 
Ectinosoma atlanticum Brady, 1880, vol. II, p. 13, pl. XXXVIII. 
Ectinosoma atlanticum Brady, 1883, p. too, pl. IV, figs. to—14. 
Microsetella atlantica Giesbrecht, 1893, p. 550, pl. 44. 
Microsetella atlantica T. Scott, 1893, p. 91. 
Microsetella atlantica Giesbrecht, 1895, p. 261. 
Ectinosoma atlanticum 1. C. Thompson, 1896, p. 24. 
Ectinosoma atlanticum YT. & A. Scott, 1896, p. 437, pls. 36, 37 & 38. 
Miucrosetela atlantica 1. C. Thompson, 1900, p. 285. 
Microsetella atlantica Cleve, 1901, p. 7. 
Ectinosoma atlanticum T. Scott, 1901 (a), p. 352. 
Microsetella atlantica 1. C. Thompson, 1903, p. 31. 
Microsetella atlantica Cleve, 1903, p. 364. 
Lctinosoma atlanticum Thompson & Scott, 1903, p. 257. 
Microsetella norvegica Sats, 1904, p. 44, pl. XXIV. 
Ectinosoma atlantica Wolfenden, 1905 (a), p. 1030. 
_Ectinosoma atlanticum Pearson, 1905, p. ©. 
Microsetella atlantica Farran, 1905, p. 46. 
Microsetella norvegica T. Scott, 1906(a), p. 309. 
Microsetella norvegica Norman & T. Scott, 1906, p. 137. 
Microsetella norvegica Williams, 1906, p. 652. 
Microsetella norvegica van Breemen, 1908, p. 173, fig. 188. 
Microsetella norvegica Sars, 1909, p. 18. 
This species although very limited in its distribution in the area investigated, was not 
uncommon in one of the collections. It was found at the following stations. 
Stat. 99. — Stat. 217, 277 specimens. — Stat. 271. — Stat. 304. 
The comparatively short furcal setae and the distinctly narrow form of the fifth pair of 
feet readily separate this species from Jccrosetella rosea. 
Microsetella norvegica appears to be widely distributed in all the great oceans. 
2. Mucrosetella rosea (Dana). 
Harpacticus roseus Dana, 1847, p. 153. 
Canthocamptus roseus Dana, 1852, p. 1189, pl. 183, figs. I—10. 
Microsetella rosea Giesbrecht, 1893, p. 550, pl. 44. 
Microsetella rosea 1. C. Thompson, 1900, p. 284. 
Microsetella rosea 1. C. Thompson, 1903, p. 32. 
Ectinosoma roseum Thompson & Scott, 1903, p. 257. 
Microsetella rosea Cleve, 1903, p. 364. 
Microsetella rosea Esterly, 1905, p. 211, fig. 52. 
Microsetella rosea Yarran, 1908, p. 91. 
Microsetella rosea van Breemen, 1908, p. 174, fig. 189. 
2D 
