660 
THE VOYAGE OF H.M.S. CHALLENGES. 
Truncatulina lobatula, Walker and Jacob, sp. (PI. XCII. fig. 10 ; PL XC1II. 
figs. 1. 4, 5 ; Pl. CXV. figs-. 4, 5). 
“Nautilus spiralis lobatus, &c.,” Walker and Boys, 1784, Test. Min., p. 20, pl. iii. fig. 71. 
Hammonise tuberculatse, &c.,’ r Soldaui, 1789, Testaceographia, voL i. pt. 1, p. 58, pl. xlv. 
figs, ii, kk, ll,.mm. 
Nautilus lobatulus, Walker and Jacob, 1798, Adams’s Essays, Kanmacber’s Ed., p. 642, pl. xiv. 
fig. 36. 
Serpula lobatula , Montagu, 1803, Test. Brit., p. 515- Suppi, p. 160. 
Truncatulina tuberculata, d’Orbigny, 1826, Ann. Sci. Nat., vol. vii p. 279, No. 1 ; — Modele, 
No. 37. 
„ lobatula, Id. 1839, Eoram. Canaries, p. 134, pl. ii. figs. 22-24. 
Discorbis lobatulus, Macgillivray, 1843, Moll. Anim. Aberd., p. 34. 
Lobatula vulgaris, Thorpe, 1844, Brit. Mar. Conch.,, p. 235. 
Truncatulina lobatula, d’Orbigny, 1846, For. Foss. Vien.,. p. 168, pl. ix. figs. 18-23. 
„ boueana, Id. Ibid. p. 169, pl. ix. figs. 24-26. 
Anumalina variolaria, Id. Ibid. p. 170, pl. ix. figs. 27-29. 
■ Truncatulina communis, Eeuss, 1855, Sitzungsb. d. k. Alt. Wiss. Wien, vol. xviii. p. 242, 
pl. v. fig. 56. 
lobatula, Parker and Jones, 1857, Ann. and Mag: Nat. Hist., ser. 2, vol. xix. p. 293, 
pl. x. figs. 17-21. 
,, Williamson, 1858, Bee. For. Gt. Br., p. 59, pl. v. figs. 121-123. 
„ varians, Beuss, 1860, Sitzungsb. d. k. Ak. Wiss. Wien, vol. xlii. p. 359, pl. ii. 
fig. 12, a.b.c. 
dekayi, Id. 1861, Ibid. vol. xliv. p. 338, pl. vii. fig. 6, a.b.c. 
Planorbulina far da, var. ( Truncatulina ) lobatula, Parker and Jones, 1865, Phil. Trans., vol. civ. 
p. 381, pl. xiv. figs. 3-6; pl. xvi. figs. 18-20. 
Truncatulina lobatula, Jones, Parker, and Brady, 1866, Monogr. Foratn. Crag, pl. ii. figs. 4-10 ; 
pl. iv. fig. 18. 
It is- impossible to define by any precise characters the morphological range of the 
present species. Its variations are in fin ite. The more convex forms lose themselves in 
Truncatulina refulgens, the more complanate in Truncatulina ivuellerstorji ; the more 
regular and compactly built specimens constitute the Truncatulina boueana of d’Orbigny, 
the less regular the Truncatulina variabilis of the same author, and the links connecting 
it with the typical Planorbulince are furnished by the Nautilus farctus of Fichtel and 
Moll. The foregoing synonymy is limited to forms bearing the common every-day char- 
acters of the species, and a much larger list might be compiled without any violence to 
natural relationship. 
Truncatulina lobatula is the commonest and perhaps the best known of all Rotaline 
Foraminifera ; it nevertheless presents one interesting peculiarity that seems to have 
escaped notice heretofore, namely, the tendency displayed by adherent specimens to form 
for themselves a covering of loosely agglutinated sand. The drawings (Pl. CXV. figs. 4 
and 5) represent two examples of this habit of growth : in fig. 4 the sandy nidus remains 
in its natural condition, intact ; in fig. 5 a portion of the covering has been removed to 
