THE FORAMINIFEEA OF LORD HOWE ISLAND. 641 
Common, and presenting all the usual modifications of biconvexity. The 
specimens are for the most part strongly developed. No specimens of the 
tuberculate varieties, so abundant in some tropical gatherings, were seen. 
197. Amphistegina lessonii, var. oibba cVOrbu/ny. 
AmpJiistegiiia gibba d'Orbigny, 1826, TMC. p. 304, no. 6. 
mamillaia d'Orbigny, 1846, PEV. p. 208, pi- 12. figs. 6-8. 
,, lessonii, var. gibba Heron-Allen & Earland, 1914-15, FKA.. 
p. 737. 
This variety is fairly frequent and typical. It is characterized by its 
marked piano-convexity. 
Opercttlina d'Orbigny. 
198. Opercdlina complanata {Defrance). 
Lenticulites complanata Defrance, 1822, Diet. Sci. Nat. vol. xxv. p. 453. 
Ojiercidina „ d'Orbigny, 1826, TMC. p. 281, no. 1, pi. 4. figs. 7-10 ; 
Module, no. 80. 
Brady, 1884, FC. p. 743, pi. 112. figs. 3-5, 8. 
Heron-Allen & Earland, 1914-15, FKA. p. 737. 
Extremely rare ; represented by two moderate-sized water-worn specimens 
and one very minute individual. The rarity of this form is noteworthy. 
Heterostegina d'Orbigny. 
199. Heterostegina depressa d' Orhigny. 
Heterostegina depressa d'Orbigny, 1826, TMC. p. 305, pi. 17. figs. 5-7; 
Modele, no. 99. 
Brady, 1884, EC. p. 746, pi. 112. figs. 14-20.. 
\, ,, Heron-Allen & Earland, 1914-15, EKA. p. 738. 
Rare, but large and well-developed. 
List of Works referred to in Abbreviated References in this Report. 
B. 1837, LG. H. G. Brown.— Lethcea Geognostiea. Stuttgart, 1837-8. 
B. 1855 FSH. J. G. BoKNEMANisr. — Die mikroskopisehe Fauna des Septarienthones vou 
Hermsdorf bei Berlin. Zeitschr. d. Deutsch. geol. Ges. vol. vii. pp. 307- 
371, pis. 12-21. 
B. 1864, RFS. H . B. Beady.— On the Rhizopodal Fauna of the Shetlands. Traus. Linn. 
Soo. (London), vol. xxiv. pp. 463-475, pi. 48. 
B. 1870, FTR. G. S. Brady, D. Robertson, & H. B. Brady.— The Ostracoda and 
Foraminifera of Tidal Rivers. Ann. & Mag. Nat. Hist. ser. 4, vol. vi. 
pp. 273-306, pis. 11, 12. 
B. P. & J. 1870, GP. H. B. Brady, W. K. Parker, & T. R. Jones.— A Monograph of 
the Genus Polymorphina. Trans. Linn. Soc. (London), vol. xxni. 
pp. 197-253, pis. 39-42. 
B. 1879 etc. RRC. H. B. Brady. — Keticidarian Rhizopoda of the ' Challenger ' Expe- 
dition. Q. Journ. Micr, Sci. u. s. vol. six. pp. 20-63, pis. 3-5 ; pp. 261- 
299, pi. 8; vol. xxi. 1881, pp. 37-71. 
