90 CJOKS, RETIC'ULARIAN HIIIZOPODA OF THE CARIBBEAN SEA. 



Globigerina nniversa D' 



Tab. VI, fie;. 194. 



This species has received a smaller number of names than most of the .other 

 species of this class, owing to its simple and nearly uniform structure in all seas and 

 in those geological strata, where it has appeared. 



Orbulina Neojurensis KARU. from the secondary strata of Austria is distinguished 

 by a strongly reticulated surface, but this feature is common within the whole genus, 

 and is not a mark of essential importance. 



A twinform is sometimes met with, which has been identified with Glob, bilobata 

 D'ORB. from the tertiary strata ;it Vienna. But n'OiiBiGNY's form is provided with a 

 lateral aperture like that in the ordinary Glob, bulloidcs. Our twinform is destitute 

 of such an orifice, in place of which it is provided with the usual large pores, scat- 

 tered between the finer ones. 



Globigerina bipartita Rss., from the Aritwerpen.-Crag may belong to this form. 



Globigerina universa of different sizes and thinness of shell is very common on 

 both sorts of bottom at our localities. 



The twinform, fig. 194, is very rare in the coralline-gravel. 



Syn. Orbulina universa n'C-RB., 1839, Cuba p. 3, t. 1, fig. 1; 1844, lies Canaries p. 122, t. 1, 



fig 1; For. ten. Vicnne p. 22, t. 1, fig. 1. 



BAIL., 1850, Microsc. Exam, of Soundings; Smitlison. Contrib. 2. :5, p. 9> 



fig. 1. 



COSTA, 1854, Pal. Nap. 2, t. 11, fig. 5. 



tuberculata, granulata COSTA, ibid. fig. 1 2; t. 15, fig. 14. 



granulata ft impressa, y areolata ibid. t. 11, figg. 3 4. 



universa WILLIAMS., 1858, Brit. rec. Porf. p. 2, fig. 4 (arcnacen"). 



Neojurensis KARU., 1867, For. Ostcrr.; Wien. Ak. Sit/.-Ber. 1. 55, p. 368, t. 3, fig. 10. 



universa WALLICH, 1876, Deepsea Researches fig. 13. 



Globigerina universa BRAD., 1879, Notes on Ret. Rhi/op. CImllcng. Exp.; CJn. Journ. Micr. Sc. 



(n. Ser.) 75, p. 289. 



Globigerina bulloides D'ORB. 



Tab. VI, figg. 195 207. 



As with most other species of this class Glob, bulloides also has its tiny pigmy- 

 form, that in some respect deviates from the type. It is usually of more regular 

 growth; the first chambers are extremely small (about 0.02 mm.) and with 5 or 6 in 

 each convolution; the pores are generally finer than in the larger and coarser form, 

 It was distinguished by D'ORBIGNY as Glob, cretacea and Glob. Dutertrei; Glob, dubia 

 EOGER. 



The stoutly developed form of Glob, bulloides commences its life with much larger 

 and fewer chambers in each convolution. It is often very irregular, the chambers 



