GOES: FORAMINIFERA. 83 
I have chosen M. contorta D'ORB., as joining the most of the features of 
recent forms belonging to this set, as the typical form. Sometimes the 
margin of one of the outer segments, usually that of the penultimate, 
is sharp and thin, without furrow (Quinqueloc. Marice D'OnB.) And when 
also the corresponding opposite segment is bordered by a thin margin, 
provided with a narrow channel, such forms approximate very nearly to 
the carinated Lamarckiana D'ORB. and its allies, 
Stout specimens have sometimes the marginal furrow of the last seg- 
ment divided by a middle rib, as in Quinqueloc. Rodolphina D'ORB. It is 
not seldom provided with a short neck. In the temperate seas it is 
usually somewhat agglutinated of fine sand. 
From Quinqueloc. concava Reuss (Pl. VII. Figs. 8-10) and excavata 
KARRER it can scarcely be specifically distinguished, those forms usually 
being thinner. 
Caribbean Sea. 159 fathoms; scarce, 
4 M. polygona b'Orz. Plate VIII. Figs. 11-18, 
Quinqueloc, polygona D'ORB., 1839, For. Cuba, p. 198, Pl. XII. Figs. 21-23, 
Mil. polygona Gois, 1894, Sv. Vet. Ak. Hdl., XXV. 9, p.111, Pl. XX. Figs. 854- 
8545; Goss, 1882, Ret. Rhizop. Caribb. Sea, Sv. Vet. Ak. Hdl, XIX. 4, 
Pl. IX. Figs. 353, 354. 
Differs little from the preceding variety, the chief difference being the 
truncation even of the antepenultima segment. The surface of this variety 
is also unpolished. The antepenultima segment is sometimes faintly striated. 
Caribbean Sea. 300-400 fathoms ; rare (Goés). 
5. M. bicostata p'Onn. Plate VIII. Figs. 19-21. 
Quinqueloc. bicostata, D'ORB., 1839, For. Cuba, p. 195, Pl. XII. Figs. 8-10. 
Mil. seminulum var. Goiis, 1882, Ret. Rhizop. Caribb. Sea, Sv. Vet. Ak. Hal, 
XIX. 4, Pl. IX. Figs. 351, 352. 
Mil. bicostata Goiis, 1804, Sv. Vet. Ak. Hdl., XXV. 9, p. 112, Figs. 855 a, b. 
Distinguished by the margin of the last two segments being broadly bi- 
tricarinated, and the other segments also usually provided with a relatively 
high keel or rib. D’Orbigny’s figures probably represent a very young 
Specimen. 
aribbean Sea. 300-400 fathoms (Goös). 
M. tricarinata p'Onn. 
Triloculina tricarinata D'ORB., 1826, Tab. Méth., An. Se. Nat., VII. p. 299, No. 7, 
Mod. 94. 
Mil. tricarinata Goiis, 1882, Ret. Rhizop. Caribb. Sea, Sv. Vet. Ak. Hdl., XIX. 4, 
Pl. IX. Figs. 837-840, 855. 
Mil. tricarinata BR., 1884, Chall. Rep., IX. p. 165, Pl. III. HA 
Mil. tricarinata Goiis, 1894, Arct, & Scand. Foramf., Sv. Vet. Ak. Hdl., XXV. g, 
P. 114, Pl. XXI. Figs. 866-869. 
