86 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
It may perhaps be identical with Bil. globulus Reuss, from Sept. Thon 
of Offenbach. Its shape reminds us also of Bil. globulus of Schlumberg, 
Revis. Biloc. grands fonds, Mém. Soc. Zool. France, IV. p. 188, Pl. XII. 
Figs. 97-100. 
Some of the enoplostoma forms represented by Schlicht, Septar. Thon 
Pietzpuhl, Pl. XX XVI., seem also to belong to this variety. 
Smaller specimens have often a glossy suriace, like sphera. 
Caribbean Sea. 683 fathoms ; scarce. 
B. comata Brapy. 
Mil. ringens var. Gos, 1882, Ret. Rhizop. Caribb. Sea, Sv. Vet. Ak. Hdl., XIX. 4, 
Pl. X. Figs. 370, 371. 
B. comata Br., 1884, Chall. Rep., IX. p. 144, Pl. IIL. Fig. 9. 
B. comata ScHiums., 1891, Biloc. gr. fonds, Mém. Soc. Zool. Fr., 1V. p. 178, Pl. X. 
Figs. 72, 73. 
B. comata Gots, 1894, Arct. & Scand. For., Sv. Vet. Ak. Hdl., XXV. 9, p. 117, 
Pl. XXII. Figs. 383, 384. 
Aperture usually short U formed, the surface lines sometimes nearly obliter- 
ate ; our form is pretty stout. 
Caribbean Sea. 600-1500 fathoms ; not common, 
ALLIED Form: — 
Mil. insignis Brapy. 
Mil. insignis Br. (1881), 1884, Chall. Rep., IX. p. 165, Pl. IV. Figs. 8-10. 
Mil. ringens var. Gots, 1882, Ret. Rhizop. Caribb. Sea, Sv. Vet. Ak. Hdl., 
XIX. 4, Pl. X. Figs. 584, 385. 
May be a triloculine form of M. comata Br., the habitus, the aperture, 
and the striation being the same in both. 
Our specimens are of a stout, globular shape. 
Caribbean Sea. 196-940 fathoms ; scarce. 
B. tubulosa Costa. 
B. tubulosa Costa, 1854, Pal. Napoli, II. Pi. XXIV. Fig. 7. 
B. lucernula Scuwae., 1866, For. Kar Nikobar, Novara Reise, Geol., Th. II. p. 202, 
Pl. IV. Figs. 14, 17. 
B. ringens var. tubulosa Gos, 1882, Ret. Rhizop. Caribb. Sea, Sv. Vet. Ak. Hdl., XTX. 
4, Pl. X. Figs. 363-365, 376-383. 
B. bulloides Br., 1884, Chall. Rep., IX. p. 142, Pl. II. Figs. 5, 6. 
B. tubulosa, trigonula (partly) Br., Ibid., p. 147, Pl. III. Figs. 6, 14. 
B. lucernula Scutums., 1891, Biloc. gr. fonds, Mém. Soc. Zool. Fr., IV. p. 185, Pl. 
XII. Figs. 90-96. 
B. tubulosa Gois, 1894, Sv. Vet. Ak. Hdl., XXV. 9, p. 118. 
A more differentiated form, with coarser, often somewhat finely agglutinating 
surface and usually circular aperture on a short neck ; its tri- or multiloculine 
larval stage structure has a propensity to continue through the adult stage. 
Pacific. 772 fathoms. 
Caribbean Sea. 1180 fathoms. 
