60 BULLETIN 71, UNITED STATES NATIONAL MUSEUM. 



ARTICULINA SULCATA Reuss [?]. 



Plate 22, fig. 5. 



Articulina sulcata Reuss, Denkschr. Akad. Wiss. Wien, vol. 1, 1849, p. 383, 

 pi. 49, figs. 13-17. — H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 

 1884, p. 183, pi. 12, figs. 12, 13.— H. B. Brady, Parker, and Jones, Trans. 

 Zool. Soc, vol. 12, 1888, p. 215, pi. 40, fig. 11.— Egger, Abhandl. kong. bay. 

 Akad. Wiss. Munchen, CI. n, vol. 18, 1893, p. 243, pi. 2, fig. 5.— Millett, 

 Journ. Roy. Micr. Soc, 1898, p. 510. 



Description. — Test composed entirely of chambers without a 

 linear series, milioline in arrangement; wall with few longitudinal 

 costae; aperture with a flaring lip, projecting beyond the outline of 

 the test, narrowly elliptical. 



Length, 0.5 mm. 



Distribution. — Brady records this species from off the reefs of 

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

 from Nero station 2071 in 271, fathoms, in the same region. The 

 material I have had is very similar indeed to that figured by Brady, 

 but it seems questionable as to whether either Brady's or our material 

 really represent the species figured by Reuss. It seems more as 

 though the recent material might be the young stage of something 

 which had a further development, but material was very rare and 

 too little for comparisons. 



Genus SIGMOILINA Schlumberger, 1887. 



Planispirina (part) H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, 



p. 193. 

 Sigmoilina Schlumberger, Bull. Soc. Zool. France, vol. 12, 1887, p. 118. — (Type, 



S. sigmoidea (H. B. Brady)). 



Description. — Test in its early stages quinqueloculine, later develop- 

 ing chambers a half coil in length in two series, with each newly 

 added chamber in a plane more than 180° from the previous one, 

 so that the horizontal plane in section shows a gradual turning about 

 the elongate axis of the test, aperture typically with a single, simple 

 tooth. 



This genus is a rather curiously modified form with the increase 

 in angle of addition to more than 180°, the chambers thus being 

 added in an increasing spiral. After the inception of the curved line 

 of addition the angle becomes nearly 180°, but the chambers are 

 added, not directly outside the previous ones, as in other genera, 

 such as Biloculina or Spiroloculina, but are added constantly at one 

 side, giving the curve to the test in transverse section and exposing 

 a number of chambers on the exterior of both sides. 



