56 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 128 



joints proportioned as in peraeopod 3. Peraeopod 5 with hind margin 

 of second joint slightly convex; remaining joints as in peraeopod 4. 

 Metasome segments as shown in figure 16, a. Urosome segment i 

 bearing dorsally a single conical protuberance bearing a small back- 

 ward-pointing apical spine. Urosome segment 2 bearing 2 transverse 

 dorsal protuberances similar to the one on segment i but smaller. 



Uropod I reaching back farther than uropod 2; peduncle longer 

 than rami, armed on upper lateral margin with 3 small spines and on 

 the outer distal corner with i stout upward-curving spine; rami 

 without lateral spines, but bearing a single short apical spine. Uropod 

 2 similar to uropod i, but shorter. Uropod 3 extending back farther 

 than uropod i, peduncle about half the length of the first joint of 

 the outer ramus ; outer ramus rather stout and broad, with a group of 

 small spines near the middle of the outer margin, a group of setae 

 near the end, and a row of setae on the inner margin; second joint 

 very small; inner ramus nearly half the length of the outer ramus, 

 inner margin and apex bearing a few setae. 



The gill of gnathopod 2 and peraeopods i, 2, and 3 bears 2 small 

 sausage-shaped appendages; gill of peraeopod 4 bears 3 appendages 

 and that of peraeopod 5 bears i appendage. Telson reaching beyond 

 the end of peduncle of uropod 3, cleft nearly to its base, each lobe 

 bearing i small lateral and a small apical spine. Length of male 

 37 mm. 



Type. — A male, U.S.N.M. No. 92784, taken from beach at Point 

 Barrow base, Alaska (71° 19' N., 156° 41' W.), September 28, 1950. 

 Received from Naval Research Laboratory, U. S. Navy. 



Female. — The female is like the male and is about the same size. 



Family DEXAMINIDAE 



GUERNEA NORDENSKIOLDII (Hansen) 



Prinassus nordenskioldii Hansen, 1887a, p. 82, pi. 2, fig. 7; pi. 3, fig. i. — 



Stephensen, 1913, p. 128. 

 Guernea nordenskioldii Stebbing, 1906, p. 522. — Shoemaker, 1930b, p. 335. 



Material collected. — In 125 feet, 4 to 5 miles out, September 9, 



1948, I specimen. In 120 feet, September 15, 1948, i specimen. In 

 741 feet, 12. 1 miles out, August 17, 1949, i specimen. In 184 feet, 

 5 miles out, August 30, 1949, i specimen. In 217 feet, 7.5 miles out, 

 September 6, 1949, i specimen. In 341 feet, 6 miles out, October 11, 



1949, I specimen. In 175 feet, 4 miles out, October 14, 1949, 

 2 specimens. 



Guernea nordenskioldii was described by H. J. Hansen from Davis 

 Strait in 1887. In 1917, 9 specimens were taken in the Gulf of St. 



