in Tertiary Rocks of New Guinea. 207 



No. 1. This consists of a cream-coloured limestone of one uniform 

 tint throughout, and is that previously determined by the writer for 

 Professor Gregory as exhibiting Akeolina, TVliliolines, and coral 

 structures, and which was referred to the Middle and Lutetian stage 

 of the Eocene period. A further examination of this pebble has now 

 furnished evidence of the presence of Lacazina and Orthophragmina, 

 so that its geological age seems to be beyond question and, moreover, 

 it fairly closely corresponds with tlie " Mixen " and " Clibs " rocks 

 of Bracklesham Bay, England, and the "Miliolite" Limestone of 

 the Paris Easin, all of which contain Alveolina associated with 

 Miliolines, and which belong as well to this stage of the Eocene 

 Series. 



No. 2. A cream-coloured limestone, but with deep reddish-brown 

 veins extending to the centre of the pebble. It contains occasional 

 Alveolina, Corals, and an abundance of the Nullipore, Lithothamnium 

 ramosissimum, whilst the absence of Miliolines and Lepidocyclines 

 may also be noted. Chiefly from the occurrence of the NuUipore, so 

 peculiarly characteristic of the Miocene limestones of Europe and 

 Far Eastern countries, this pebble is regarded as belonging to that 

 division of the Tertiary system. 



No. 11. Is cream-coloured, but intersected by thin dark veinings. 

 It resembles No. 1 in possessing similar coral structures, of which it 

 is mainly composed. Miliolines are also present, the polished surface 

 exhibiting a transverse section of Pentdlina like saxorum. No 

 Alveolines are discernible, but the assemblage denotes an Eocene 

 origin for this pebble. 



No. 12. A yellowish cream-coloured limestone containing Miliolines, 

 Textularia, Carpenteria conoidea, etc., and Lithothamnium ramosissimum, 

 the latter suggestive of its Miocene age. 



No. 28. This is mainly composed of a stellate coral structure, 

 although its narrower end reveals some minute Eorarainifera, 

 especially an Alveoliniform-looking organism, occurring as transverse 

 and longitudinal sections on the polished surface, which represents 

 Lacazina ivichmanni, a New Guinea fossil of known Eocene age. 



Organisms contained in the Pebbles. 



FORAMINIFEEA. 



Alveolina wichmanni, Rutten. (PI. VIII, Figs. \a, 2a, 3, 4a, 5, 6.) 



Alveolina wielimanni, Rutten, Wichmann's Nova Guinea, yoI.-v'i, "Geologie," 

 pt. ii, pi. ix, figs. 1, 2, p. 45, 1914 ; Samml. Geol. Reichs.-Mus. Leiden, 

 ser. I, vol. ix, pi. xxvi, figs. 3, 4, and pi. xxvii, fig. 2, pp. 315-18, 1914. 



This is an Eocene species having been originally described from 

 the limestones of south-west New Guinea (Triton Bay) and after- 

 wards from the Island of Celebes. It presents a narrow, tapering, 

 and spindle-shaped axis composed of few and often irregularly formed 

 layers which vary in number from nine to fourteen. Those forms 

 with more regularly disposed layers are represented by Figs. 3 and 

 4a, whereas Figs, la and 2a show a greater irregularity and thus 

 more closely approach the type. A transverse section displayed on 

 the polished surface of the pebble. Fig. 6, exhibits a series of 



