REPORT ON THE FORAMINIFERA. 
165 
Miliolinci insignis, H. B. Brady (PI. IY. figs. 8, 10). 
Miliolina insignis, Brady, 1881, Quart. Journ. Micr. Sci., vol. xxi., N. S., p. 45. 
This species has the same general contour as Miliolina trigonula, and the arrange- 
ment of the segments is in all respects similar, but the surface of the shell instead of 
being smooth is ornamented by delicate, closely set, longitudinal costas. Some of the 
Atlantic specimens attain considerable dimensions and are relatively shorter and more 
stoutly built than the typical form. Length, xyth inch (1 '5 mm.). 
Miliolina insignis has been met with at tw T o of the Challenger Stations in the North 
Atlantic, namely, off Sombrero Island and off Culebra Island, West Indies, at 390 fathoms 
and 450 fathoms respectively ; in the South Atlantic at Station 346, near the Equator, 
2350 fathoms, and off Pernambuco, 350 fathoms ; in Simon’s Bay, Cape of Good Hope, 
15 to 20 fathoms; in Bass Strait, 38 fathoms ; and at one point in the deep area of 
the North Pacific (Station 244) 2900 fathoms. The species also occurs in shallow water 
on the coast of Ceylon, and Mr. Robertson’s cabinet contains specimens from the coast 
of Java. 
Miliolina tricarinata, d’Orbigny, sp. (PI. III. fig. 17, a.b.). 
Triloculina tricarinata, d’Orbigny, 1826, Ann. Sci. Nat., vol. vii. p. 299, No. 7 ; — Modele, No. 94. 
Cruciloculina triangularis, Id. 1839, Foram. Amer. Merid., p. 72, pi. ix. figs. 11, 12. 
Triloculina gibba, Id. 1846, For. Foss. Yien., p. 274, pi. xvi. figs. 22-24. 
Miliola gibba, Egger, 1857, Neues Jahrb. fur Min., &c., p. 271, pi. vi. figs. 1-3. 
Triloculina tricarinata, Brady, 1864, Trans. Linn. Soc. Lond., vol. xxiv. p. 446, pi. xlviii. fig. 3. 
Miliola ( Triloculina ) tricarinata, Parker and Jones, 1835, Phil. Trans., vol. civ. p. 409, pi. xv. fig. 40. 
Triloculina tricarinata, Reuss, 1867, Sitzungsb. d. k. Ak. Wiss. Wien, vol. lv. p. 71, pi. ii. fig. 4. 
This species presents the extreme development of Triloculine characters. It bears 
the same morphological relation to Miliolina trigonula that Biloculina depressa bears to 
Biloculina ringens ; that is to say, the peripheral margin of the segments is in the one 
case angular or carinate, and in the other rounded. In Bilocidina depressa the carina 
is formed by the free edge of the ultimate segment ; in Miliolina tricarinata two of the 
angles are formed by the outermost segment and the third by the free margin of the 
penultimate. 
The genus Crucilocidina was founded by d’Orbigny for a Miliolina with exactly the 
same disposition of segments, but with a cruciate aperture instead of one of the ordinary 
Milioline type. It is needless to say that the aperture is too variable a feature amongst 
the Porcellanea to be accepted by itself as a specific, still less as a generic distinction. 
The Triloculina gibba of the “ Vienna Basin ” monograph only differs from Miliolina 
tricarinata in its slight irregularity of contour and somewhat blunt chamber- 
margins. 
Miliolina tricarinata has a far wider geographical distribution than its near ally 
(zoor. CHALI. EXP. PART XXXI.— 1883.) Y22 
