34 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
AMMODISCUS Reuss. 
A. incertus p’Ors. 
Operculina incerta D’ORB., 1839, For. Cuba, p. 19, Pl. VI. Figs. 16, 17. 
Trochammina incerta Gois, 1882, Ret. Rhizop. Carib. Sea, Sv. Vet. Ak. Hdl., XIX. 
4, Pl. XI. Figs. 404, 405. 
A, incertus, tenuis Br., 1884, Chall. Rep., IX. pp. 330, 332, Pl. XXXVIII. Figs. 1-6. 
A. incertus Gos, 1894, Arct. & Scand. Foramf., Sy. Vet. Ak. Hdl., XXV. 9, p. 31, 
Pl. VI. Figs. 288-241. 
In the depths of the Pacific this form attains a considerable development, and 
is represented in certain localities in great abundance. A. tenuis Br., with 
large initial chamber and 5-7 whorls only, is usually associated with the type, 
and is to be considered as a megalaspheric or more mature form of that. The 
color of both varies from reddish brown to straw-yellowish. 
Pacific. 660-1132 fathoms ; in greatest abundance at 1000 fathoms. 
Caribbean Sea. 382-1830 fathoms; scarce, and not so highly developed. 
HORMOSINA Brapy. 
H. globulifera Brapy. 
H. globulifera Br. (1879), 1884, Chall. Rep., IX. p. 826, Pl. XXXIX. Figs. 1-6. 
H. globulifera Gos, 1893, Arct. & Scand. Foramf., Sv. Vet. Ak. Hdl., XXV. 9, p. 29, 
Pl. VI. Figs. 218, 219. 
Not quite typical samples have been brought home, The produced neck, that 
may be considered as the most prominent feature of Brady’s form, is often 
wanting ; the surface is sometimes not as smooth as in this, and multilocular 
samples are rare ; unilocular ones much resemble smooth forms of Saccammina. 
When the shell becomes more rough, the multilocular form may be difficult 
to distinguish from Reophaz pilulifer Br. 
Pacific. 885-1879 fathoms ; not common. 
Caribbean Sea. 1035 fathoms; not common. 
H. ovicula Brapy var. 
Plate IV. Figs. 1-3. 
H. ovicula Br. (1879), 1884, Chall. Rep., IX. p. 827, Pl. XX XIX. Figs. 7-9. 
Very variable in size and length and narrowness of the chamber-necks. 
Tn some instances the necks are nearly wanting and substituted by deep im- 
pressions ; such forms are often hardly distinguishable from the preceding. Our 
form has usually more globular segments than that represented by Brady. The 
color is usually brick-red or reddish brown. 
Pacific. 789-1879 fathoms ; scarce and small. 
Caribbean Sea. 420-1830 fathoms ; not so rare. 
