24 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
Usually very slender, with needle-formed origin, gradually increasing in 
thickness ; the annular impressions often very conspicuous ; test generally 
smooth, sometimes glossy, of yellow or reddish brown color, like that of a 
smooth Hyperammina elongata. May be considered as a pygmy form of the 
type. Length about 10 mm. A stout straight specimen, somewhat more 
than an inch in length and one mm. in diameter, found off Acapulco in 
772 fathoms, may with some doubt also be ranked with this variety. 
Pacific. 772-1201 fathoms. 
Caribbean Sea, 1346 fathoms; rare. 
CRITHIONINA Gois. 
C. pisum, n. 
Plate Il. Figs. 1. 2. 
Usually globular or subglobular, with comparatively smooth surface, often 
here and there provided with irregular impressions; wall thick, obsoletely 
subcavernous ; traces of septa very obsolete; texture very loose, chalky, homo- 
genous ; color whitish or gray. Diameter 1-3 mm. 
Gulf of Mexico. 940 fathoms; rare. 
C. rugosa, n. 
Plate Il. Figs. 3, 4. 
Subglobular, with coarsely tuberculated surface ; wall thick, obsoletely cav- 
ernous, the chamber somewhat irregular, showing faint traces of subdivision; 
color gray or whitish; the consistency of the shell is usually loose, the tex- 
ture being finely arenaceous, with a large portion of shell débris. It seems to 
be closely allied to C. mamilla Gos, Arct. & Scand. Foramf., Sv. Vet. Ak. Hdl., 
XXV. 9, p. 15, Pl. III. Figs. 34-36, which is smaller and affixed. Diameter 
1-2 mm. 
Pacific. 885-1879 fathoms; not plenty. 
C. lens, n. 
Plate Il. Figs. 5-8. 
Flattened, orbicular or oblong, often somewhat irregular in its contour; 
its cavity is more or less regularly subdivided in radial chamberlets or tubes, 
originating in an oval or globular undivided central chamber. When this is 
very large, the subdivided part looks as if constituting the shell wall itself. 
Sometimes the central cavity is reduced or obsolete. Surface relatively smooth, 
texture fine and loose; color light ash-gray. Diameter 2-4 mm. 
Fig. 5, marginal ; Fig. 6, lateral aspect; Figs. 7, 8, the inner laid open from 
both sides. 
Pacific. 772-1122 fathoms. 
