36 SYNOPTIC COLLECTION. 



has found one-chambered shells in the pre-Cambrian 

 rocks of Brittany, but is unable to determine with cer- 

 tainty whether they are primitive Foraminifera or Radio- 

 laria ; he thinks they may be the latter and therefore does 

 not figure them. They are doubtless older than those 

 discovered in New Brunswick, as pointed out by Mat- 

 thews, since they occur in an older series of rocks and are 

 very much smaller in size. Associated with the unilocu- 

 lar forms are Foraminifera consisting of from two to seven 

 chambers (PI. 29, figs. 1-6) and belonging to the Perfor- 

 ata. Fig. i shows a two-chambered shell, figs. 2 and 3, 

 three-chambered shells, figs. 4 and 5, two different forms 

 of four-chambered shells; fig. 6 is the only shell possess- 

 ing more than four chambers that M. Cayeux has found. 

 The irregularity and imperfect attempts of these primitive 

 Perforata to make a symmetrical shell remind one of the 

 similar efforts and results among the Imperforata already 

 figured and described. 



The microscopic slide No. 30 represents the Globige- 

 rina ooze from the deep sea off Cape Hatteras obtained 

 by the U. S. S. Albatross, in 1883. Although the Glo- 

 bigerina shells predominate in it, yet a number of other 

 genera are also represented. PI. 31 is a beautiful draw- 

 ing taken from the Narrative of the Challenger Report 

 (Vol. i, part 2, PI. N, fig. 10. p. 926) of Globigerina ooze 

 seen by reflected light. This was dredged from a depth 

 of 1900 fathoms in lat. 21 38' N.. long. 44 39' W. Slide 

 No. 32 exhibits Globigerina shells dredged from the At- 

 lantic. No. 33 is the rosy Globigerina rubra d'Orbigny. 

 PI. 34, fig. i, is the young of a bottom specimen of Glo- 

 bigerina bulliodes d'Orbigny, which does not possess 

 spines; PL 34, fig. 2, the adult, showing more chambers, 

 and fig. 3, a view of the same, showing the large opening 

 of the last chamber. 



We have already pointed out that doubtless Globigerina 

 arose from a single hollow sphere such as Orbulina 

 (slide No. 35) appears to be when observed externally ; 



