692 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. XXXIII. 



Fig. 3.~HoLOPHRYXus giaedi. Lmmature female, a 

 Dorsal view. 6. Lateral view. c. Ventral view 

 X 14i. 



The adult female is al)oiit four and a half times longer than the 

 immature female. The stage represented by the immature female 

 must be a stage younger than the one described by G. O. Sars,« for 

 Dajus mysidin Kr0yer. It must be a stage intermediate between that 

 and the cryptoniscian stage, because of the presence of the six pai!rs 

 of legs. The stage represented by Sars has only five pairs of legs, as in 

 the two succeeding stages and in the adult stage. 



No males were found. 

 After the photograph was 

 made the parasite was re- 

 moved from the host for 

 the purpose of study. 



This species di tiers from 

 the type species of the 

 genus, Holophryxus ala- 

 scensin Richardson, in the 

 form of the body, which is 

 more tapering, the thorax 

 not being so greatly swol- 

 len and the abdomen not so 

 abruptly narrower, as in 

 that sj)ecies; in having the head surrounded by a wide marginal 

 squarish ridge or border anteriorly and laterally; in the difference in 

 the shape and the position of the marsupial plates; and in having the 

 first segment of the abdomen indicated by a slight incision on either 

 side of the terminal segment. 



The species is named for Prof. Alfred Giard. 



The type from Toporkov Island, Bering Island, is in the U. S. 

 National Museum, Cat. No. 38337. 



HOLOPHRYXUS CALIFORNIENSIS, new species. 



Locality. — One fine specimen of this interesting species was col- 

 lected in Santa Barbara Channel, California, in green mud at a 

 depth of 280 fathoms. It is described on the label which accompanies 

 it as a parasite, but the host is not given. Its color in life is men- 

 tioned as being canar}^ yellow. 



Another specimen comes from Station 4753 on the way from Yes 

 Bay to Seattle at Bushby Point at a depth of 150-280 fathoms. This 

 adult female was attached. The photograph (fig. 4) shows the para- 

 site attached to the dorsal side of the carapace of the host, Pasi- 

 phcea padflca Rathbun with the head directed posteriorly. This spe- 

 cies is similar to the preceding species in the elongated form of the 

 body, but differs in lacking the wide anterior ridge, and in not 



« Crustacea of Nomay, II, 1899, pp. 223-224, pi. xciv, 9iuv.=' 



