ROTALITDAE—DISCORBIS; CYMBALOPORA. 41 
Discorbis subaraucana, new species. 
(Plate 7, Figures 1, 2.) 
Test unequally biconvex, dorsal side somewhat arched, the ventral side 
very slightly convex, flattened, or even somewhat concave; periphery not 
lobulated, composed of about 2.5 coils, 6 to 8 chambers in the last-formed 
one; sutures oblique, curved, limbate on the dorsal side, except in the last 
2 or 3 chambers in the adult, ventrally also somewhat limbate, especially in 
the early stages; wall with numerous puncte; aperture at the base of the 
ventral side of the last-formed chamber, narrow; color of the earlier chambers 
reddish-brown, those of the last-formed ones usually white. 
Diameter up to 0.40 mm. 
The Tortugas material shows a species which is common and 
which is more like the figures referred by Brady to Discorbis araucana 
than it is to the originals of d’Orbigny. The figures here given 
(plate 7, figs. 1 and 2) show the general characters of these specimens. 
It is the most common in the area and is probably widely distributed 
in the Pacific and Indian Oceans. 
Genus CYMBALOPORA Hagenow, 1850. 
Cymbalopora squammosa (d’Orbigny). 
(Plate 6,fFigures 4 to 6.) 
Rotalia squammosa d’Orbigny, Ann. Sci. Nat., vol. 7, 1826, p. 272, No. 8. 
Rosalina squammosa d'Orbigny, in De la Sagra, Hist. Fis. Pol. Nat. Cuba, 1839, ‘* Forami- 
niféres,”’ p. 91, pl. 3, figs. 12 to 14. 
Rosalina poeyi d'Orbigny, in De la Sagra, Hist. Fis. Pol. Nat. Cuba, 1839, ‘‘Foraminiféres,”’ 
p. 62, pl. 3, figs. 18 to 20. 
Cymbalopora poeyi Carpenter, Parker, and Jones, Introd. Foram., 1862, p. 215, pl. 13, 
figs. 10 to 12.—Moebius, Beitr. Meeresfauna Insel Mauritius, 1880, p. 97, pl. 10, 
figs. 1 to 5.—H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 636, pl. 
102, figs. 13 a to c—H. B. Brady, Parker, and Jones, Trans. Zool. Soc. London, 
vol. 12, 1888, p. 226, pl. 46, fig. 12—Rhumbler, Zool. Jahrb., Abt. Syst., vol. 24, 
1906, p. 71, pl. 5, fig. 59.—Cushman, Bull. 71, U. S. Nat. Mus., pt. 5, 1915, p. 24, 
pl. 10, fig. 1; pl. 14, fig. 5; fig. 28 (in text)—Heron-Allen and Earland, Trans. 
Zool. Soc. London, vol. 20, 1915, p. 687. 
Discorbina poeyi Goés, Kongl. Svensk. Vet. Akad. Handl., vol. 19, 1882, No. 4, p. 107, pl. 
8, figs. 264, 265. 
Test subconical, trochoid, dorsal side forming a cone, bluntly pointed, of 
variable height, ventral side flattened or very slightly concave, consisting 
usually of 6 or 7 chambers, of peculiar shape, widest at the outer border, 
thence contracted, widening again, and finally contracted again, tapering 
toward the center, where all are united; chambers separated by a definite 
depressed area; aperture at the margin of the base of the last-formed cham- 
ber; color of the earlier portion reddish-brown, the latter part white. 
Diameter of the Tortugas specimens up to 0.75 mm. 
This is one of the common species in the region, occurring at 
nearly all the stations. It was originally given a name by d’Orbigny 
in 1826, his specimens coming from Martinique. In 1839 he de- 
scribed the species under the genus Rosalina, and with it Rosalina 
poeyt. These have been considered the same species by most 
authors, but the name poeyi was taken by Carpenter in 1862 and 
has since been followed. However, according to the rules of priority, 
the name squammosa used in 1826 by d’Orbigny is not a nomen 
