54 SHALLOW-WATER FORAMINIFERA OF TORTUGAS REGION. 
the coral blocks and dead shells were thickly spotted with the tests 
belonging to this species. In the most perfectly formed of these 
specimens the test is made up of a circular mass about 8 mm. in 
diameter, slightly raised above the surface, and with numerous aper- 
tures, one central and the others arranged in a ring above this, near 
the periphery. The details of the surface are very similar to those 
figured by Hickson. Where these specimens are protected from 
wear, being in cavities, the apertures are even more elongate, and 
living specimens have a crown of spicules about each of these, as 
shown (plate 14, fig. 8). The plates near the edge are more coarsely 
perforated than those of the main body of the test. The spicular 
crowns are made up of entire or broken sponge-spicules, pieced 
together in a peculiar manner. Some of these are shown (text- 
figs. 4, 5). One of these in more detail is given (text-fig. 6) and a 
portion of this is enlarged to show the method of cementing. These 
have a transparent cementing material which seems to be more or 
less elastic. It is difficult to determine the precise character of the 
material; strong acids apparently had no effect in dissolving it. 
With these are certain pinkish forms, apparently distinct from the 
deep red of the Homotrema, and which are very rare, compared 
with the deep-red form. These need careful study and comparison 
with similar forms from other parts of the West Indies. 
Genus ASTERIGERINA d’Orbigny, 1839. 
Asterigerina carinata d’Orbigny. 
(Plate 9, Figures 4 to 6.) 
Asterigerina carinata d’Orbigny, in De la Sagra, Hist. Fis. Pol. Nat. Cuba, 1839, ‘‘ Forami- 
niféres,”’ p. 118, pl. 5, fig. 25; pl. 6, figs. 1, 2—Cushman, Carnegie Inst. Wash., 
Pub. 291, 1919, p. 45; Proc. U.S. Nat. Mus., vol. 59, 1921, p. 60, pl. 14, figs. 6 to 8. 
Test unequally biconvex, coiled, the dorsal side very slightly convex, the 
ventral side strongly so, almost conical; chambers numerous, about 3 coils, 
6 or 7 forming the last-formed coil; sutures oblique, very slightly limbate, 
produced to form a slight translucent keel; sutures curved and oblique on the 
dorsal side, on the ventral side the supplementary chambers extending nearly 
to the periphery, forming rhomboid areas; sutures distinct, very slightly 
depressed; wall smooth, finely punctate and usually glistening, often some- 
what roughened by lines of small granules near the aperture, which is an 
elongate, narrow slit, extending from the umbilical region about halfway to . 
the periphery, and usually with a slight, thin lip. 
Diameter of the Tortugas specimens not usually exceeding 0.6 mm. 
This is described by d’Orbigny from the shore sands of Cuba and 
Jamaica and I have recorded it from Jamaica and from the Miocene 
of Santo Domingo, from Bluff 2, Cercado de Mao, and it extends as 
far north as Cape Hatteras and probably is widely distributed in 
the West Indian region. Brady did not place the species of Asteri- 
gerina as synonyms in the Challenger report, but mentions them as 
‘probably related to Amphistegina.’’ They do have somewhat the 
