212 University of California Publications. [ ZOOLOGY 
2. Genus Euterpe Claus. 
Harpacticus Dana, 1847, p. 152; 1852, p. 1189. 
Euterpe Claus, 1863, p. 109. 
Euterpe Giesbrecht, 1892, pp. 78, 555. 
2 Anterior portion of body with four segments, posterior 
with five; front of head pointed (cf. fig. 53a). Anterior an- 
tennae 7-jointed, posterior 3-jointed, outer ramus 1-jointed. 
Rami of swimming feet 2-jointed in the first pair, 3-joited in 
second to fourth pairs; fifth pair rudimentary (fig. 53d). 
4 First and second abdominal segments not fused (fig. 53a) : 
anterior antennae (fig. 53¢) are powerful grasping organs, 
fourth and fifth joints fused and much thickened, geniculat- 
ing with the hooked terminal joint which is composed of the 
fused sixth and seventh joints. Rami, especially the inner, of 
the first pair of feet of peculiar form; fifth pair shorter and 
with fewer bristles than in the female. 
1. Euterpe acutifrons Dana. 
Harpacticus acutifrons Dana, 1847, p. 153; 1852, p. 1192; 1855, 
pl. 83, fig. lla, b. 
Euterpe gracilis Claus, 1863, p. 109, pl. 14, figs. 1-13. 
Euterpe acutifrons Giesbrecht, 1892, p. 555, pl. 44, figs. 16-31. 
The only species of the genus. 
Coloration: Transparent, almost without pigment, but 
digestive canal is often yellowish or green. 
Length: Male, .73 mm.; females slightly smaller. 
Oceurrence: Abundant in catches with Oithona, Oncaea and 
Corycaeus. 
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