168 
THE VOYAGE OF H.M.S. CHALLENGER. 
namely, Nares Harbour, Admiralty Islands, 17 fathoms ; Humboldt Bay, Papua, 37 
fathoms ; and olf Honolulu, Sandwich Islands, 40 fathoms. 
Miliolina subrotunda, Montagu, sp. (PI. V. figs. 10, 11). 
“Serpula subrotunda dorso elevato” Walker and Boys, 1784, Test. Min., p. 2, pi i. fig. 4. 
Vermiculum subrotundum, Montagu, 1803, Test. Brit., part 2, p. 521. 
,, „ Fleming, 1823, Mem. Wern. Nat. Hist. Soc., vol. iv. p. 565, pi. xv. fig. 5. 
Quinqueloculina subrotunda, d’Orbigny, 1826, Ann. Sci. Nat., vol. vii. p. 302, No. 36. 
„ dilatatci, Id. 1839, Foram. Cuba, p. 166, pi. xi. figs. 28-30. 
,, meridionalis, Id. 1839, Foram. Am6r. Merid., p. 75, pi. iv. figs. 1-3, 10-13. 
Triloculina truncata , Karrer, 1864, Sitzungsb. d. k. Ak. Wiss. Wien., vol. 1. p. 704, pi. i. fig. 2. 
Miliula ( Quinqueloculina) subrotunda, Parker and Jones, 1865, Phil. Trans., vol. civ. p. 411, pi. xv. fig. 38. 
Quinqueloculina subrotunda, Brady, 1865, Nat. Hist. Trans. Nortbd. and 13 ur., vol. i. p. 94, pi. xii. fig. 2. 
Triloculina dilatata, Karrer, 1868, Sitzungsb. d. k. Ak. Wiss. Wien, vol. lvii. p. 139, pi. ii. fig. 1. 
Miliola subrotunda, Fischer, 1870, Actes Soc. Linn. Bordeaux, vol. xxvii. p. 386, No. 4. 
Quinqueloculina orbicularis, Terquem, 1876, Anim. sur la Plage de Dunkerque, fasc. ii., p. 86, pi. xii. 
fig. 9, a.b. 
The characters of Miliolina subrotunda may be stated in very few words. The shell 
is either Triloculine or Quinqueloculine, broad, compressed, and suborbicular, and the 
peripheral margin is thick and rounded. It is subject to irregularity both in the shape 
and disposition of the segments, and in the form of the aperture, which in well-grown 
examples has generally a conspicuous Milioline tooth ; but the general aspect of the 
shell answers to the foregoing description. Fleming (loc. cit.) states that the (visible) 
“ chambers are three sometimes four in number, inflated and wrinkled,” and that “ the 
fourth chamber when present seems always imperfectly formed,” by which he means 
shorter than normal ; and he gives an excellent figure of the species in this condition, 
taking on the Hauerine mode of growth. Such specimens are common in shallow water 
on our own coast, and have sometimes been confused with true Hauerince. Its more 
regular varieties resemble Miliolina secans in their broad discoidal contour ; but the 
inflated chambers and thick rounded margin are sufficiently distinctive when con- 
trasted with the sharp peripheral edge of the latter species. 
It would require a large series of figures to represent adequately the individual modi- 
fications of this form, but the illustrations referred to in the foregoing synonymy serve 
collectively to give a general idea of its various aspects. The drawings (PI. V. figs. 10, 11) 
are from South Atlantic specimens, off Tristan d’Acunha, 100 to 150 fathoms. The shell 
figured by Messrs. Parker and Jones (loc. cit.) is from the Arctic seas ; and the remainder 
of the list includes specimens from the British and French coasts, the West Indies, and 
South America, in every case from shallow water or from littoral sand. 
The fossil Triloculine specimens described by Dr. Karrer are from the Miocene of the 
Vienna Basin and of the Banat. The species occurs also in the Crag of Suffolk. 
