38 BULLETIN 71, UNITED STATES NATIONAL MUSEUM. 



porcellanous, imperforate, usually ornamented by striations or costae ; 

 aperture a long narrow slit either at the outer end of the chamber or 

 somewhat laterally placed; typically with a definite lip. 



According to the distinctions made by d'Orbigny this genus 

 included species which had the early chambers arranged in a piano- 

 spiral manner, later becoming uniserial and uncoiled. This dis- 

 tinction has not been strictly adhered to and it has become not unusual 

 to find either this genus or Articulina used for both. Certain of the 

 forms assigned to Vertebralina do have an external resemblance to a 

 planospiral condition in the young, but like Hauerina are really 

 milioline. ■ 



The number of species is very small, mostly known from recent 

 material. 



VERTEBRALINA STRIATA d'Orbigny. 



Plate 22, figs. 3, 4. 



Vertebralina striata d'Orbigny, Ann. Mag. Nat. Hist., vol. 7, 1826, p. 283, No. 1; 

 Modeles, No. 81. — Williamson, Recent Foram. Great Britain, 1858, p. 90, 

 pi. 7, figs. 196a, b [197, 198]. — Carpenter, Parker, and Jones, Introd. 

 Foram., 1862, p. 72, pi. 5, figs. 17-25. — Parker, Jones, and H. B. Brady, 

 Ann. Mag. Nat. Hist., ser. 3, vol. 16, 1865, p. 32, pi. 1, fig. 1.— Brady, Rep. 

 Voy. Challenger, Zoology, vol. 9, 1884, p. 187, pi. 12, figs. 14-16.— Egger, 

 Abhandl. bay. Akad. Wiss. Munchen, Cl. n, vol. 18, 1893, p. 243, pi. 3, figs. 

 33, 34.— Millett, Journ. Roy. Micr. Soc, 1898, p. 607, pi. 13, fig. 1.— Side- 

 bottom, Mem. and Proc. Manchester Lit. and Philos. Soc, vol. 48, 1904, pt. 2, 

 No. 5, p. 18; vol. 54, pt. 3, 1910, No. 16, p. 6. — Chapman, Journ. Quekett 

 Micr. Soc, ser. 2, vol. 10, 1907, p. 125. 



Description. — Test compressed, slightly trochoid, early portion 

 close coiled, increasing rapidly in diameter, last formed chambers in 

 adult becoming uniserial, broadly expanded, the sutures strongly 

 curved, slightly depressed, surface ornamented by fine longitudinal 

 striae; aperture elongate, irregular, the lip on one side being shorter 

 than on the other, making the aperture really on the ventral side of 

 the test, lip smooth, ends rounded and not projecting. 



Length, up to 1.2 mm., usually less. 



Distribution. — Brady records this species in one of his tables from 

 off Honolulu, Hawaiian Islands, in 40 fathoms. I have had material 

 from several Nero stations near the Hawaiian Islands, 2034 in 175 

 fathoms; 2037 in 55 fathoms; 2039 in 24 fathoms; 2071 in 271 fathoms; 

 and 2074 in 22 fathoms. Most of Bagg's material from this region 

 was from deeper water, which probably accounts for its nonoccurrence 

 in his report. 



The trochoid arrangement of the chambers in the typical species, 

 V. striata, and its aperture on the ventral side of the test make it 

 very different from V. insignis, which is in these two points very 

 unlike the generic characters, and it may be questioned whether they 

 really belong together. 



