350 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 
ent joint beyond the center. On the posterior surface on either side 
of the joint is a small papilla tipped with a minute seta. The seg- 
ment beyond the joint is abruptly widened and armed with a stout 
bifurcate process. The tooth on the inner margin of the outer arm is 
at or near the center. 
UNDINULA VULGARIS (Dana) 
PLaTE 19, Figure 260 
Undina vulgaris DANA, Proc. Amer. Acad. Arts and Sci., vol. 2, p. 22, 1849; United 
States Exploring Expedition, 1838-1842 (Wilkes), vol. 14, pt. 2, Crustacea, p. 
1092, 1858 ; pl. 77, fig. 8 a—d, 1855. 
Stations 15; 16; 27; 80; 31; 48; 71; 73; 75-80; 3799; 3829; 3834; 
3867; 3878; 8901; 3912; 3929; 3930; 3932; 3980; 4009; 4010; 4011; 
4037; 4086; 4538; 4588; 4592; 4598; 4600; 4607; 4611; 4615; 4619; 
4627; 4635; 4638; 4640; 4644; 4646; 4653; 4700; 4738; 4926; 4952; 
5102; 5105; 5120; 5126; 5183; 51384; 5155; 5175; 5180; 5185; 5186; 
5190; 5191; 5196; 5211; 5223-5230; 5240; 5246; 5258; 5262; 5263; 
5309; 5319; 53820; 5338; 5340; 5342; 5348; 5349; 5358; 5382; 5386; 
5887; 5896; 5897; 5412; 5415; 5422; 5424; 5434; 5489; 5507; 5580; 
5553; 5578; 5595; 5596; 5633; 5646; 5651; Lloilo Straits, Caldera Bay 
anchorage, and Sabtan Island, Philippine Islands; Fiji Islands; Gil- 
bert Islands; Marshall Islands. A very widely distributed species in 
all planktons; in addition to these Albatross localities, it was reported 
from 4 stations in the Wilkes plankton by Dana, “in all the gatherings 
from the tropical Atlantic,” by Brady in the Challenger plankton, 
and from 75 Siboga, 25 Monaco, and 89 Carnegie stations. It is also 
often found in large numbers; Scott listed 11 stations yielding 100 to 
400 specimens each and 1 station at which 1,336 specimens were 
obtained. Many of the A/batross stations yielded over a hundred 
specimens apiece and one, station 4009, in the Hawaiian Islands, pro- 
duced a solid pint of specimens, half of which were vulgaris. 
Genus VALDIVIELLA Steuer, 1904 
VALDIVIELLA INSIGNIS Farran 
Valdiviella insignis Farran, Fisheries Ireland, Sci. Invest. for 1906, pt. 2, p. 45, 
pl. 8, figs. 1-6; pl. 4, fig. 5, 1908. 
Stations 4719; 5233; Iloilo Straits, Philippine Islands. Identified 
by Sars from the first of these Albatross stations, and from 16 Monaco 
stations; both sexes were fully described and figured in the Monaco 
report. First reported from the Pacific area by Sewell (1929, p. 135), 
who collected both sexes in the Indian Ocean. 
