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



While this species resembles E. media Giesbrecht in some 

 respects, the shape of the rostrum, the bristling of the maxilla. 

 and the outer ramus of the second foot separate the two sharply. 



Euchaeta acuta var. pacifica n. var. 



PI. 32, fig. 115. 

 'Euchaeta acuta, Giesbrecht. (Esterly, 1905, p. 157, fig. 23). 



Adult male. The fifth feet closely resemble those of E. acuta, 

 as shown by Giesbrecht (1892, pi. lt>. tigs. 18, 19), but the pro- 

 cess ou the second joint of the outer ramus of the left foot is not 

 pyramidal and pointed, and in addition the inner ramus of the 

 right foot is broadened at the distal end and carries a flap-like 

 appendage (pi. 32, tig. 115). There are no other noticeable dif- 

 ferences, yet the process mentioned is usually a well-marked 

 character in the differentiation of species. So it seems as if the 

 Sau Diego form should at least be made a variety. 



Occurrence: Station 1099, vertical from 35 f., June 20, 1906. 



Euchaeta solida n. sp. 



PI. 26, fig. 2; pi. 28, fig. 34; pi. 30, fig. 78. 



Adult male. The shape of the body is shown in fig. 2; the 

 rostrum is heavy and straight, and pointed directly clown I pi. 28, 

 fig. 34) ; the frontal protuberance is not very marked. 



The main point about the species is the shape of the toothed 

 process on the second joint of the outer ramus of the left fifth 

 foot; it is scoop-like and expanded distally (pi. 30, fig. 78). 



Length: 5.22 mm. 



Coloration: Somewhat opaque and whitish in formalin. 



Occurrence: Station 1315. tow at. and vertical from, 320 f., sounding 

 330 f., July 19. 1906. 



This species occurred with females of E. spinosa, tonsa and 

 diegensis, but it does not seem to me that that alone is evidence 

 enough to ally it with one of them. 



Genus Xanthocalanus Giesbrecht. 

 Xanthocalanus tectus n. sp. 



PI. 28. fig. 33; ].l. 29. fig. 53; pi. 31, fig. 95. 

 Adult female. The head is smoothly rounded but with a 

 very slight crest (pi. 28, tig. 33), and the forehead protrudes 



