44 BULLETIN 71, UNITED STATES NATIONAL MUSEUM. 



peripherally bordered by the wider median keel, which is denticulate 

 about the basal half of the border. 



Length of North Pacific specimens 1 mm. 



Distribution. — Found in the North Pacific material only at Alba- 

 tross station H2902 in 1,783 fathoms near the Hawaiian Islands. 



This seems to agree nearly enough with the above variety to 

 warrant its being placed here. The opaque ring is here decidedly 

 raised and annular but the other characters are very similar. 



LAGENA ORBIGNYANA (Seguenza), var. CONCENTRICA Sidebottom. 



Plate 19, fig. 2. 



Lagena orbignyana (Seguenza), var. concentrica Sidebottom, Journ. Quekett 

 Micr. Club, vol. 11, 1912, p. 417, pi. 19, fig. 23. 



Description. — Test compressed, but umbonate, median keel well 

 developed, inner keel less prominent; body portion ornamented by 

 concentric costse, apertural end bluntly pointed. 



Length 0.6 mm. 



Distribution. — Figured specimen from Nero station 1464 in 891 

 fathoms off Guam. 



Although more umbonate than shown in the figure referred to 

 above, this specimen has all the essential characters of this variety. 



LAGENA ORBIGNYANA (Seguenza), var. CLATHRATA H. B. Brady. 

 Plate 11, fig. 4. 



Lagena clathrata H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 484 ? 



pi. 60, fig. 4. — Balkwill and Millett, Journ. Micr., vol. 3, 1884, p. 82, pi. 2, 



fig. 14; pi. 4, fig. 3. 

 Lagena orbignyana, var. clathrata Millett, Journ. Roy. Micr. Soc., 1901, p. 628, 



pi. 14, fig. 23. — Sidebottom, Journ. Quekett Micr. Club, vol. 11, 1912, 



p. 418. 



Description. — Variety with the central portion of the test orna- 

 mented with longitudinal costae. 



Length 0.25 mm. 



Distribution. — This variety occurred at two Nero stations, 1294 in 

 1,417 fathoms and 1448 in 2,084 fathoms between Guam and 

 Yokohama. 



Our specimens are not typical of the variety, as they are much 

 more finely costate than is Brady's figure of this variety. 



LAGENA ORBIGNYANA (Seguenza), var. CRENULATA, new variety. 



Plate 20, fig. 2. 



Description. — Variety with the central portion of the test orna- 

 mented by very slightly developed, irregular strisB, the border 

 regularly pitted, inner keel normal, outer keel broad, the surface 



