1911] Esterly: Copepoda of lh< San Diego Region. 319 



Undeuchaeta incisa n . s[>. 

 PI. 27, figs. 12, 19; pi. 28, fig. 28; pi. 29, Sg. 59. 



Adult female. The head is crested and has a rather promi- 

 nent rostrum (pi. l!7, fig. 19). The last thoracic segment is 

 rounded on the righl side and produced on the lefl into a pro- 

 cess which is notched at the end (pi. 28, fig. 28; pi. 29, fig. 59). 

 The cephalothorax is a little over four times as long as the ab- 

 domen ami furca (pi. 27, fig. 12). The genital segment is mark- 

 edly protuberant ventrally; there is a lamellar process at the 

 right of the orifice, and on the right of the segment about the 

 middle there is a wine-like extension (pi. 28, fig. 28; pi. 29, 

 fig. 59). 



The cephalothorax and abdomen are 4-segmented. The geni- 

 tal segment is as long as the second and third together, the second 

 about half as long as the third and the anal half as long as the 

 second. The furca] rami are short, broader than lone, and aboul 

 as long as the anal segment. 



The anterior antennae extend a little beyond the end of the 

 body. The posterior antennae are of the usual shape and the 

 inner ramus is half the length of the outer. The maxilla has 

 the form characteristic of the genus: the outer ramus has eleven 

 bristles and the three middle ones are considerably shorter than 

 the others. 



The outer ramus of the first foot is indistinctly 3-jointed, 

 the suture between the first and second joints being indicated by 

 a line; there are two outer marginal spines. The spines of the 

 outer margin of the outer ramus of the first foot are much longer 

 than in the second and third feet. 



Length: 6.1 nun. 



Coloration: The animals are without pigment. 



Occurrence: Station 1252, tow at, and vertical from, 310 f., sounding 

 345 f., July 11, 1906; station 1270, tow at. ami vertical from, loot'., sound- 

 ing 170 1'., .Inly 13, 1906; station 1303. tow at. ami vertical from, 315 f., 

 sounding 340 f., July Is, 1906. 



