90 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.48. 



G. O. Sars) they ought to have taken Brandt's description of the 

 dorsal armature into consideration. The species is easily separated 

 from all other forms of the genus excepting T. spinifera Holmes by 

 having some abdominal segments dorsally carinate and armed with 

 spiniform processes; from T. spinifera it is separated by several 

 excellent differences (eyes, antennulse in the males, prehensile legs, 

 abdominal armature, etc.). 



Distribution. — Brandt's specimens were from the Sea of Okhotsk. 

 With this exception the list above comprises our total knowledge of the 

 distribution of T. longipes. 



28. THYSANOESSA SPINIFERA Holmes (1900). 

 Plate 3, figs. la-Ik. 



1900. Thysanoessa spinifera Holmes, Occ. Papers Cal. Acad. Sciences, vol. 7, 



p. 229, pi. 4, fig. 81. 

 1911. Thysanoessa spinifera H. J. Hansen, Bull, l'lnst. Oc6an. Monaco, No. 210, 



pp. 38 and 41. 



Occurrence.— Taken at places in Bering Sea and the North Pacific 

 along America from Alaska to near the southern end of California. 



Hyd. 3242. June 5, 1893. Lat. 57° 40' N.; long. 143° 18' W. 

 Off Alaska. 1 specimen. 



Sta. 4753. October 1, 1905. Lat. 55° 41' 30" N.; long. 131° 46' 

 12" W. 150-0 fathoms. 3 specimens. 



Sta. 3263. June 24, 1893. Bering Sea. Lat. 55° 04' N.; long. 

 165° 04' W. 1 specimen. 



Sta. 4767. June 3, 1906. Lat. 54° 12' N.; long. 179° 07' 30" E. 

 300-0 fathoms. 1 specimen. 



Sta. 4758. May 19, 1906. Lat. 52° 02' N.; long. 132° 53' W. 

 300-0 fathoms. 1 specimen (male). 



Albatross, 1888. Barclay Sound, Vancouver Island. (About lat. 

 49° N.; long. 125° W.) Electric light. 4 specimens (male, female). 

 Surface. 1 specimen. 



Sta. 3444. August 27, 1891. Lat. 48° 16' 30" N.; long. 123° 

 29' 40" W. About 15 specimens. 



April 5, 1913. From stomach of salmon caught between Tacoma 

 and Seattle, Washington. C. H. Gilbert. 2 specimens. 



Sta. 4757. May 4, 1906. Lat. 39° 18' N.; long. 123° 58' W. 

 2 young specimens. 



Sta. 4426. April 14, 1904. Off Point San Pedro, Santa Cruz 

 Island, California. (About 34 °N .) 1 specimen. 



Sta. 4367. March 16, 1904. Point Loma L. H., vicinity of San 

 Diego, California. (About lat. 32§° N.) 1 specimen. 



Description. — Rostrum (fig. 16) very long, somewhat tapering, 

 acuminate and very acute, equal in both sexes or in the male slightly 

 narrower than in the female. The most anterior part of the carapace 



