38 BULLETIN" 71, UNITED STATES NATIONAL MUSEUM. 



Length 0.25 to 1.50 mm. 



Distribution. — This species in its various modifications is common 

 in the North Pacific. Goes records it from the eastern Pacific in 

 695 to 1,201 fathoms and Bagg from four Albatross stations in the 

 vicinity of the Hawaiian Islands, D4017, D4174, H4430, and H4696, 

 in 305, 735-865, 1,544, and 367 fathoms, respectively. I have seen 

 specimens from Nero station 172 in 2,086 fathoms near the Midway 

 Islands, Albatross H3007 in 323 fathoms near the Hawaiian Islands, 

 from over 25 Nero stations between Guam and Yokohama at depths 

 ranging from 518 to 2,250 fathoms, from three Albatross stations off 

 Japan, D4843, D4875, and D4953, in 100, 59, and 1,350 fathoms, 

 respectively. It also occurred at two Tuscarora stations, 47 in 

 lat. 24° 20' N.; long. 154° 06' E., in 1,499 fathoms, and 58 in lat. 

 26° 52' N.; long. 142° 21' E., in 814 fathoms. 



There is much variation in the comparative breadth and the char- 

 acter of the keel and in the amount of compression of the test and 

 in the size of various specimens. 



LAGENA MARGINATA (Walker and Boys), var. 

 Plate 21, fig. 2. 



Description. — Test with a thin peripheral keel, broadest toward the 

 base and sides, slightly emarginate below and gradually decreasing 

 in width toward the apertural end, where it ceases entirely, leaving 

 the upper third of the test noncarinate. 



Length 0.75 mm. 



Distribution. — Found at three stations between Guam and Yoko- 

 hama, Nero stations 1155 in 1,632 fathoms, 1299 in 1,817 fathoms, 

 and 1300 in 1,529 fathoms. 



This is somewhat different from typical L. marginata. 



LAGENA MARGINATA (Walker and Boys), var. 

 Plate 21, fig. 3. 



Description. — Test compressed, with a peripheral keel similar to 

 the preceding, but inside it a band similar to L. fasciata next an 

 opaque band and a clear center, as in L. lucida. 



Length 0.85 mm. 



Distribution. — Found at Albatross station H2766 off the Hawaiian 

 Islands in 196 fathoms. 



This is a rather peculiar form, uniting, as it does, the characters of 

 L. marginata, L. fasciata, and L. lucida. 



