LITUOLIDAE—AMMOBACULITES; TROCHAMMINA; CARTERINA. 21 
origin, and the fact that the wall in this species is composed almost 
entirely of quartz grains shows the selective power of the organism. 
A considerable amount of bottom sand must be gone over by the 
animal before a sufficient amount of quartz grains can be obtained 
for the making of the test. The specimens are very uniform in 
size, shape, and general characters, and are to be looked for under 
shallow-water tropical conditions elsewhere. It differs from the 
species which I have found in the Gulf of Mexico and in the Carib- 
bean in deeper water. 
Genus CARTERINA H. B. Brady, 1884. 
Rotalia Carter (in part), Ann. Mag. Nat. Hist., ser. 4, vol. 20, 1877, p. 470. 
Carterina H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 345.—Chapman, 
The Foraminifera, 1902, p. 152. 
Test rotaliform, biconvex, of numerous chambers, those of the dorsal side 
all visible, from the ventral side only those of the last-formed coil; umbilicate; 
wall composed of numerous oval spicular bodies, elongate, rounded, or 
pointed at the ends; aperture ventral, opening on the umbilicate area. 
This genus is represented by the single species Carterina spiculotesta 
(Carter). This has been placed with the Lituolide, although the test 
is entirely a secreted one and not dependent on the outside bodies 
for its formation. 
Carterina spiculotesta (Carter) . 
(Plate 1, Figure 5.) 
Rotalia spiculotesta Carter, Ann. Mag. Nat. Hist., ser. 4, vol. 20, 1887, p. 470, pl. 16; ser. 
5, vol. 3, 1879, p. 144; ser. 5, vol. 5, 1880, p. 452. 
Carterina spiculotesta H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 346, pl. 
41, figs. 7 to 10.—Millett, Journ. Roy. Micr. Soc., 1899, p. 365.—Chapman, Journ. 
Linn. Soc., Zool., vol. 28, 1900, p. 184.—Sidebottom, Mem. Proc. Manchester 
Lit. Philos. Soc., 1905, p. 6, pl. 1, fig. 10 —Heron-Allen and Earland, Trans. Linn. 
Soc., Zool., vol. 20, 1915, p. 620. 
Test normally adherent, rotaliform, biconvex, the dorsal side rounded, 
ventral side slightly rounded, flattened or concave in the central portion, 
umbilicate, composed of 3 or 4 volutions, the earlier ones regular, the later 
ones becoming irregular; chambers distinct; walls thin, translucent, composed 
largely of fusiform calcareous spicules, with a calcareous cement; aperture 
small, at the umbilical margin of the ventral side of the last-formed chamber, 
with a slight lip; color of the central part dark brown, the later-formed 
portion white. 
Diameter of the Tortugas specimen 0.50 mm. 
This species, which heretofore has been recorded only from the 
Indo-Pacific region, has occurred as a single specimen from station 
22, in 6 fathoms. The specimen is referred to this species, and is 
composed almost entirely of the peculiar fusiform spicules so char- 
acteristic of this genus. The species seems usually to be attached 
to Halimeda, and it may be much more common in this region than 
the single specimen indicated, if it had been looked for under such 
conditions. 
