Le University of California Publications. [ ZOOLOGY 
Occurrence: July 9, 1903, one male; July 22, 1903, one 
female. 
Fig. 18.—Euchirella messinensis. (a) Head of female, lateral, X15. (b) 
Abdomen of female X15. (c) Head of male X30. (d) 
Fifth foot of male X20. 
2, Euchirella rostrata Claus. 
Undina rostrata Claus, 1866, p. 11, pl. 1, fig. 2. 
Euchaeta hessei Brady, 1883, p. 63, pl. 20, figs. 1-13; pl. 23, figs. 
11-14. 
Euchirella rostrata Giesbrecht, 1892, pp. 233, 245, pl. 15, figs. 3, 
13, 25; pl. 36, figs. 19, 20; 1898, p. 36. 
Euchirella rostrata Cleve, 1900, p. 4, pl. 2, figs. 1-12. 
2 Front without crest, with rostrum, abdomen symmetrical. 
Inner ramus of posterior antennae 14 as long as outer ramus; 
second joint of inner ramus with 8-6 bristles. First basal of 
fourth pair of feet (fig. 195; B. 1) with 6 or 7 triangular lamellae 
on the inner border. Bristle on outer margin of second joint of 
outer ramus of the second pair reaches at least to the point of 
the first bristle on the outer border of the third joint of the 
ramus. 
4 Head without crest, with rostrum. Fifth foot six times as 
long as its second basal joint. Margin of second joint of outer 
ramus not denticulate, third joint smooth. Inner ramus of pos- 
terior antenna 14 as long as outer. First basal of fourth foot 
without triangular lamellae. (Cleve 1900). 
