576 BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



HOLOPHRYXUS ALASCENSIS Richardson. 



IMophryxus alascends Richardson, Bull. U. S. Fish Comm., XXIV, 1905, pp. 

 220-221. 



Localities. — Vicinity of Yes Bay, Behm Canal; vicinity of Fiinter 

 Bay, Lynn Canal. 



Depth. — 147 to 350 fathoms. 



Body of female irregular in outline. Color uniformly light yellow. 



Head represented by a bilobed prominence anterior to squarish l)ody. 



Fig. 639.— Holophryxus alascensis. a, Dorsal view of female, x 3^. h. Lateral view of 



FEMALE. X %\. C, VENTRAL VIEW OF FEMALE. X 3^. 



Eyes wanting. Dorsal surface of thorax with no trace of segmenta- 

 tion. A few lines oidy are present, representing creases or folds in 

 the integument and having no relation to suture lines. 



The abdomen projects below^ the thorax, although there is no dis- 

 tinct boundary between these two divisions of the body, as a triangular 



process without any trace of segmentation and with 



no appendages. 



Uropoda and pleopoda are entirely wanting. 

 In a hiteral view the tirst 



live segments of the thorax 



are represented ])v the live 



coxal plates, which bound 



the oral area, and are not 



separated l\y sutures from 



the dorsal surface of the 



body. On the ventral side 



the oral area is bounded 

 anteriorly by the head and laterally ))y the two divergent rows of 

 coxal plates. The antenmv and antennul^ are quite rudimentary. 

 Theantenna^seemto l)e composed of three joints, the antennula?of two. 

 There are live pairs of legs, surrounding the oral area, situated just 

 within the two rows of coxal plates. From the bases of these legs 

 five pairs of incubatory plates arise, the last pair overlapping in the 

 middle ventral line. 



No males were found. Three specimens were taken by the U. 8. 



Fig. 640.— Holophry.xus 



ALASCENSIS. MaXILLI- 

 PED. X 271. 



Fig. 641.— Holophryxus 

 ALASCENSIS. First in- 

 cubatory LAMELLA (DIS- 

 T.\L LOBE). X 27J. 



