NOTES ON RETICUL.VRIAN RHIZOPODA. 287 



fication of the " rubra " type, in which the early segments are 

 small and compactly arranged, and the spire convex rather 

 than trochoid; the later segments are large, particularly 

 the three forming the final convolution, and disposed so as 

 to give a convex base. The apertures on the superior surface 

 are numerous, and the test is thick and coarsely perforated. 



Glohigerina sacculifera, Brady {' Geol. Mag.,' Decade ii, 

 vol. iv, p. 535). — This is a distinct and conspicuous variety, 

 briefly noticed in a short paper on the Foraminifera of a 

 piece of white friable limestone from the New Britain Group 

 [loc. cif.). It is characterised by its large outspread test, of 

 of which the terminal chamber or chambers are pouch-shaped 

 or pointed. The apertures on the superior surface are 

 numerous ; that of the final segment is sometimes directly 

 over the inferior orifice, making a passage, as it were, 

 right through the shell. 



Glohigerina JieUchia, d'Orbigny (' Ann. Sci. Nat.,' vol. vii, 

 p. 279, No. 5 ; — Soldani, * Testaceographia,' vol. i, pt. 2, pi. 

 130, figs. j9/), qq, rr) — is an anomalous oblong form and one 

 rarely met with. It is not easy to describe it intelligibly 

 without the aid of figures. It most resembles an ordinary 

 small Globigerine shell, with the addition of a little inflated 

 chamber at two opposite points of its periphery. The superior 

 surface is obscurely spiral and shows two, three, or more 

 apertures. The inferior side has four visible segments; two 

 large and oblong, laid side by side, and two- small and in- 

 flated, one at each end of the test ; the later have inferior 

 apertures. It is possible that Gl. helicina may represent a 

 monstrous condition rather than one of the more permanent 

 varieties of the type. I have met with precisely analogous 

 specimens in two other allied genera, and these have been 

 treated as abnormal developments of the species to which 

 they are related, namely, Pullenia ohliqueloculata and Can- 

 dcnia niticla. Justice has, perhaps, scarcely been done to 

 the accuracy of Soldani^s drawings in the present instance. 

 Dr. Carpenter (' Introd.,' pi. 12, fig. ) employs the name 

 Gl. helicina for what appears to be only an immature speci- 

 men of a quite different variety {Gl. sacculifera). Of the 

 three figures in the ' Testaceographia,' referred to by 

 d'Orbigny, that marked qq, which gives both the superior 

 and inferior aspects of the shell, is the most cha racteristic, 

 and leaves nothing to be desired in point of defi nition. 



There is little difficulty in distributing the Gloherigina of 



