522 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



Locality, near the station; 5 fathoms, muddy bottom. Not plenty. 

 Museum Nos., 7899, 7900. 



Phyllopoda. 



7. Polyartemia hazeni, ii. sp. 



Description. — Body long (twice the length of the abdoinen) and stout. 

 Legs, generally seventeen pairs ; males usually with one pair more than 

 the females. Head in the male prolonged anteriorly into a short, thin 

 lamellar process. Male " clas^jers " large, stout, broad, and palmate, 

 strongly incurved. From the middle of the lower edge projects a large 

 curved process armed on the tip and inner surface with numerous fine 

 teeth. The extremity of the ''clasper" is bifurcated into two short 

 blunt branches, also armed on the inner side with fine teeth. Feet short 

 and broad. Caudal appendages small and slender, a little longer than 

 the last abdominal segment. Ovisac voluminous, nearly as long as the 

 abdomen ; end rounded, with a short, tooth like process on each side. 

 Oolor, when living, a pale iridescent green. 



Locality, fresh-water pools on the tundra near the station ; summer. 



Abundant. 



Museum Nos., 7929, 7930, 7931. 



llespectfully dedicated to General W. B. Hazeu, Chief Signal Oflicer, 



United States Army. 



VERMES. 



Telethuse^. 



8. Arenicola glacialis, n. sp. 



This 8i)ecies is closely allied to Arenicola marina, but has only six 

 setigerous segments anterior to the gills, and eleven gill-bearing seg- 

 ments, instead of seven and thirteen as in A . marina. 



These numbers are constant in the five specimens obtained. The six 

 abianchiate segments are each composed of five distinct annulations, 

 and each bear a pair of simi)le tubercular feet. The dorsal setje are all 

 of one kind, about eighteen in number, slender and slightly serrulate, 

 the longest longer than the foot. The ventral setae are thirty-five to 

 forty in number, and form a single row on each side of the ventral sur- 

 face of the ring. They are short, slender, and simple, and barely pro- 

 ject above the surface of the skin. The branchiate segments are each 

 composed of six annulations. Each branchia consists of one cluster of 

 about fifty simple cirri, annulated in contraction. The branchiae in- 

 crease in size from the first to the ninth pair; the tenth and eleventh 

 pairs are slightly smaller. The feet are small and tubercular ; the dor- 

 sal setae, seven, similar to those of the abranchiate segments, but only 

 about two-thirds of their length. The ventral setie are the same as in 

 the abraucliiate segments. 



The caudal portion is about one-third of the length of the animal, with- 

 out tubercles or other appendages. Color in alcohol, blackish graj', 

 lighter on the ventral surface. 



Locality, beach near the station after a fresh westerly gale. 



Museum Nos., 851, 854. 



Smithsonian Institution, November 1, 1884. 



