320 University of California Publications in Zoology. [Vol.6 



Genus Euchirella Giesbrecht. 

 Euchirella simplex n. sp. 



PI. 26, fig. 10; pi. 29, figs. 50, 62. 



Adult female. The head lias a high and rather pointed crest 

 (pi. 29, fig. 50), and the last thoracic segment is very broadly 

 rounded at the sides. The head is produced below into a minute 

 point (pi. 29, fig. 50), which can scarcely be called the rostrum. 



The cephalothorax and abdomen are both 4-segmented, the ab- 

 di mien with the furca is about one-sixth the length of the cephalo- 

 thorax. The first abdominal segment is as long as the last three 

 together but does nut show any peculiarities. The f ureal rami 

 are widely divergent and as long as the anal segment. (PI. 29, 

 fig. 62). 



The anterior antennae are 23-jointed and when folded back 

 reach a little beyond the last thoracic segment. The posterior 

 antenna has the outer ramus two and one-half times the length 

 of the inner. The outer ramus of the maxilla has ten bristles, 

 the inner ramus three large bristles; the second basal has three 

 bristles of which two are very small, and the outer marginal lobe 

 has seven. 



The outer ramus of the first foot is 3-jointed with three spines 

 on the outer margin. In the second foot the outer marginal spine 

 of the second joint of the outer ramus is long and curved and 

 reaches a little beyond the tip of the first outer marginal of the 

 second joint. The first basals of the fourth feet are without the 

 spines usually found in this genus, there being only the plumose 

 bristle. 



Length: 6.36mm. 



Coloration: The mouth-parts and region are a very deep red; the basal 

 halves of the anterior antennae are light red, and the plumose bristles on 

 the posterior antennae are orange. The first pair of feet are the color of 

 tlic mouth-parts, while the thorax and remaining pairs of feet are light red. 



Occurrence: Station 1303, tow at, and vertical from, 315 f., sounding 

 340 f., July 18, 1906. 



Euchirella simplex differs from all other species in lacking 

 the spines on the first basal of the fourth foot, but it approaches 

 the genus so closely in other respects that I have not removed it. 

 /•;. curticauda Giesbrecht is also cristate and non-rostrate. 



