BemarJis on the Foraminifera. By Frof. T. Bupert Jones. 67 



alternations, or less regularly, there is no special grouping. Obser- 

 vations can now be multiplied in these directions, with the help of 

 good aquaria, towards the knowledge of Ehizopodal life. 



Shells of the Imperforata. — In the opaque shells of the Miliolida 

 (see Table), an important group of the Forcellana or hnperforata, 

 there is only one outlet for the sarcode, whether as pseudopodia, or 

 sarcoblasts (Wallich), or as a stolon with new segmental growth. 

 The simplest forms of their adult shells are either a mere cell-like 

 shell (SquamuUna), or a discoidal spiral tube (Cornuspira). A 

 similar coil forms the commencement of some Miliolx, which enlarge 

 with half-turns of tubular shell (investing a wire-like sarcode, 

 pinched at the bends), on one or three planes.* By growing out 

 straight, after having made a few of the alternate-sided (agathis- 

 tegian) turns, the shell becomes a CeratospiruUna, linking Miliola 

 with Vertehralina. 



The tooth-like process, or obsolete septum, in the aperture, is 

 sometimes bifid ; and by extending as a cribriform plate it becomes 

 the distinguishing feature of Hauerina. The inward extension of 

 this oral network, as labyrinthic structure, characterizes Quinquelo- 

 culina saxorum and Fabularia. Another modification of the 

 Forcellana is seen in the forms typified by Orbiculina and Fene- 

 roplis, towards which some flat, wide-spread Sauerinse seem to 

 lead us, whilst Fabularia and Alveolina have a similar internal 

 structure. Further, a Spiroloculina (from the Orbitoidal limestone 

 of Java) is figured by Ehrenberg,t which " is very interesting in 

 having lateral stolons from segment to segment, showing a pro- 

 lepsis of the more complicated and closely related Orhitolites, the 

 outside of the quasi-annular segments being multistoloniferous. 

 These supernumerary stolons begin by few, and become many 

 in later segments." | 



Dr. Carpenter states : § ''I have lately come into possession, 

 through the kindness of M. Munier-Chalmas, of the Sorbonne 

 Museum, of a new fossil type of Foraminiferal structure belonging 

 to the Orbiculine group, in which a partial coalescence (or sub- 

 division) of chamberlets, like that of the lamellar jjortion of Eozoon, 

 is very distinctly marked, so as to establish precisely the link of 

 connection which was wanting between the chambers of Feneroplis 

 and the completely divided chamberlets of OrhicuUna." 



* See Williamson's ' Rec. Brit. Foram.,' &c, 1858; and W. K. Parker, "On 

 Miliola," ' Trans. Microscop. Soc.,' new ser., vol. vi., p. 53. Here I take the 

 opportunity of stuting that for facts and views given in this paper I am largely 

 indebted to my friend Prof. W. K. Parker, F.R.S., with whom I have had the 

 jjleasure of working on the Foraminifera for twenty years. 



t ' Transact. R. Acad. Berlin ' (for 18o.n), 1856, pi. 4, fig. xxii. 



t ' Annals Nat. Hist.,' Oct. 1872, p. 2(35. 



§ ' Annals Nat. Hist.,' ser. 4, vol. xiii., p. 4G7. 



