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joint is furnished with two short stout spines. The exopodites and endopodites of the second, 
third and fourth pairs of feet are three-jointed. The fifth pair is very small, foliaceous and 
one-jointed. 
One species belonging to this genus was represented in the plankton collected by the 
‘Siboga’ in the Malay Archipelago. 
1. Llyopsyllus affints T. Scott. 
Llyopsyllus affints T. Scott, 1893, p. 101, pl. XI, figs. 4—17. 
Llyopsyllus. affints A. Scott, 1902, p. 417. 
Llyopsyllus affints Thompson & Scott, 1903, p. 275. 
Five males and one female identical with the above species were found in the plankton 
collected at the following stations. 
Stat. 19, 2 males. — Stat. 89, 1 male. — Stat. 213, 1 female and 2 males. 
Llyopsyllus affinis is closely related to Llyopsyllus cortiaceus Brady and Robertson, but 
the female can readily be distinguished by the non-spathuiate character of the principal seta 
on the furcal joints. 
This species has -been recorded from the Gulf of Guinea, the Gulf of Suez, and from 
the coast of Ceylon. 
36. Family Tacuipipaer. 
Genus Euterpina Norman, 1903. 
The only known member of the genus is readily recognised by the slender arched 
body, by the prominent sharp pointed rostrum, by the long slender second pair of maxillipedes, 
and by the one-jointed foliaceous fifth pair of feet. 
This genus was represented in the plankton collected by the ‘Siboga’ in the Malay 
Archipelago. 
1. Euterpina acutifrons (Dana). 
Hlarpacticus acutifrons Dana, 1847, p. 153. 
Harpacticus acutifrons Dana, 1852, p. 1192, pl. 83, fig. 11a—é. 
Euterpe gracilis Claus, 1863, p. 110, pl. XIV, figs. I—13. 
Euterpe gracilis Brady, 1880, vol. Il, p. 22, pl. XL, figs. 1—16. 
Euterpe acutifrons Giesbrecht, 1893, p. 555, pl. 44. 
Euterpe acutifrons, var. armata T. Scott, 1893, p. 93, pl. XII, figs. 14—23. 
Euterpe acutifrons 1. C. Thompson, 1896, p. 25. 
Euterpe gracilis Brady, 1899, p. 39. 
Euterpe acutifrons 1. C. Thompson, 1900, p. 285. 
Euterpe acutifrons A. Scott, 1902, p. 409. 
Euterpe acutifrons 1. C. Thompson, 1903, p. 32. 
Euterpina acutifrons Norman, 1903, p. 368. 
Euterpina acutifrons Thompson & Scott, 1903, p. 258. 
Euterpe acutifrons Cleve, 1903, p. 363. 
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