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ROTALIIDAE—TRUNCATULINA; SIPHONINA. 49 
dorsal side of the two being very similar, but the ventral side very 
different, that of 7. candeiana being distinctly convex, while that of 
T. cora is very flat. 
Truncatulina advena (d’Orbigny). 
(Plate 7, Figures 6 to 9.) 
Truncatulina advena d’Orbigny, in De la Sagra, Hist. Fis. Pol. Nat. Cuba, 1839, ‘ Fora- 
miniféres,’’ p. 97, pl. 6, figs. 3 to 5. 
Test plano-convex, dorsal side flattened, ventral side rounded; periphery 
lobulated; last-formed coil composed of about 8 chambers; sutures of the 
dorsal side much curved, those of the ventral side nearly radial, gently curved, 
depressed much more on the ventral than on the dorsal side; wall coarsely 
punctate; aperture close to the periphery at the inner edge of the last-formed 
chamber, short and somewhat arched; color very slightly brown in the inner 
whorls, otherwise white. 
Diameter of the Tortugas specimens not exceeding 0.50 mm. 
This species, described by d’Orbigny from the shore sands of Cuba 
and Jamaica, has occurred at several stations in the Tortugas col- 
lection. It is somewhat closely related to Truncatulina lobatula 
(Walker and Jacob), but differs in several points from that species 
as developed in temperate climates. The sutures in 7’. lobatula are 
typically limbate and the periphery carinate, but in this tropical 
T. advena such characters do not occur. From the flattened dorsal 
surface it would seem that the species is probably an attached one. 
Genus SIPHONINA§Reuss, 1849. 
Siphonina pulchra Cushman. 
(Plate 7, Figures 11, 12.) 
Siphonina pulchra Cushman, Carnegie Inst.Wash., Pub. 291, 1919, p. 42, pl. 14, figs. 7a toc. 
Siphonina reticulata Cushman (not Czjzek), Carnegie Inst. Wash., Pub. 291, 1919, p. 42. 
Test in front view nearly circular, rotaliform; composed of numerous 
chambers in several whorls, in end view much compressed, widest in the 
central region, thence gradually tapering to the sub-acute periphery, chambers 
usually about 5 to each whorl, indistinct, except the last-formed chamber, 
which is somewhat more clearly defined by the slightly depressed suture, 
those of the other chambers being even with the surface and very indistinct; 
aperture exsert, with a short neck extending out from the periphery, passing 
into a broadly’ flaring lip with a distinct, extended border, aperture itself 
narrowly elliptical, several times as long as wide: wall of test of a darker gray 
with markings of a lighter color, those of the center rounded, those toward 
the periphery more linear. 
Diameter of the Tortugas specimens up to 0.65 mm. 
Numerous specimens of S. pulchra are in this collection from the 
Tortugas, but usually few from any one station. They are evidently 
the same as the species I have described from the marl of the gorge 
of the Yumuri River, Matanzas, Cuba. JI also recorded from this 
same marl Siphonina reticulata, but a reexamination of these speci- 
mens and a comparison with the Tortugas ones seems to show that 
the young of Siphonina pulchra is somewhat fimbriate on the border, 
and the ornamentation of the test is much more coarse than in the 
