208 R. Bullen Newton — Forcwvmifera, etc., 



apertures which represent tlie longitudinal channels that perforate 

 the organism throughout its longer axis. A good longitudinal view 

 of a weathered specimen exposing a partial interior is illustrated by 

 Fig. 5, in which the margins of the layers are to be observed together 

 with the closely set, external, transverse striations. Miliolines of 

 the Quinqueloculine type and other Forarainifera accompany this 

 species, see Figs, lb, 2b, and 4b of Plate VIII. 



Dimensions. — Length 3-8, width l-2Jmm. 



Occurrence. — Pebble No. 1. 



Distribution. — Eocene deposits of New Guinea and the Island of 

 Celebes. 



Alveolina sp. (PI. IX, Fig. 6^.) 



A longitudinal section of tliis genus occurs in No. 2 pebble 

 associated with LitJiothamnium ramosissimiim. It is rounded at the 

 poles and not fusiform as is the case in A. wichmanni, being most 

 nearly related to A. melo (Fichtel & Moll), which, according to Brady, ^ 

 ranges from Eocene to Recent seas. The presence of the Nullipore 

 in this pebble strongly supports its Miocene origin. 



Dimensions. — 1 by ^mm. 



Occurrence. — Pebble No. 2. 



Lacazina wichmanni, Schluniberger. (PI. IX, Figs. 1, 2, 3«.) 



Alveolina sp., of. A. spherica (Fortis), Marthi & Schwager : Samml. Geol. 



Eeichs.-Mus. Leiden, vol. i, pp. 70-83. pi. iii, figs. 9-10, 1881. 

 Lacazina wichmanni, ydilumberger. Bull. Soc. Geol. France, ser. Ill, 

 vol. xxii, pi. xii, pp. 295-8, 1894 ; Eutten, Wiehmann's Nova Guinea, 

 vol. vi, " Geologie," pt.ii, pi. viii, figs. 8, 9, p. 44, 1914. 

 The form here referred to is of frequent occurrence in No. 1 pebble, 

 and is also found in No. 28 pebble accompanying a stellate coral 

 structure. Specimens showing both longitudinal and tz'ansverse 

 sections are well exposed on the polished surfaces of the limestones, 

 and they resemble Martin's figures of Alveolina sp. found in the 

 north-west coastal regions of New Guinea, which was determined by 

 Schwager as being related to A. xpherica (Fortis\ the equivalent of 

 A. melo (Fichtel & Moll), a characteristic Miocene species. At 

 a later date, however, Schlumberger studied Martin's material - and 

 recognized the supposed Alveolina sp. as a new species of Lacazina, 

 Munier-Chalmas (Bull. Soc. Geol. France, ser. iir, vol. x, p. 472, 

 1882, tx^e = Alveolina compressa, Orbigny), a genus hitherto restricted 

 to the younger Cretaceous rocks of Europe and Palestine. 



The chief features of inteiest respecting L. icichnanni are its 

 possession of a spherical initial chamber succeeded by chambers the 

 walls of which are alternately open below and above the poles 

 throughout its growth. The chambers are also divided internally 

 by numerous longitudinal ribs radiating from the external wall of 

 each chamber and often appearing to reach the inner surface of the 

 succeeding laj'er. These characters are more or less expressed in the 

 present examples, although the delicate openings of the chamber 

 walls are most difficult to trace, and their existence is only obscurely 

 indicated. The radio-longitudinal ribbing appears also to be finer 



^ CJiallenger Report : Foraminifera, 1884, pi. xvil, figs. 13-1-5, p. 223. 



