F. Chapman — Egyptian Foraminifera. 11 



Patellina was well described by Williamson, who took the typical 

 little P. corrugata for the jDiirpose. This form is quite hyaline 

 throughout. In most cases the large fossil forms above referred to 

 show very little evidence of hyaline structure, but it is extremely 

 probable that this absence of tubulation is due to recrystallization 

 of the calcitic substance of the shell-wall. In the Egyptian Patellina, 

 however, by careful examination under high powers, a distinct but 

 extremely fine tubulation can be made out in portions of the 

 hell-wall better preserved, the tubules sometimes radiating in 

 i characteristic manner. 



Couulites was founded on specimens of Patellina from India, but 

 described at later date than Williamson's type-form. This form 

 approximates very closely to the Egyptian species in general 

 structure. 



The whole group of the PatelUnce require a systematic and 

 exhaustive study, and this I believe is being undertaken by 

 Mr. A. Vaughan Jennings, who possesses a valuable collection of 

 material for the purpose. I will here express my sincere thanks 

 to Mr. Jennings for much assistance in making comparison with 

 (pecimens of Patellina from his collection. 



J, Patellina Egyptiknsis, sp. nov. (PI. IT, Figs. 1-3.) 



Test conoidal, in vertical section nearly equilateral, the two sides 

 slightly convex, straight, or incurved in the middle of the test ; 

 base circular in outline, and with a slightly convex sui'face ; 

 peripheral edge rounded. The chambers are arranged on two 

 plans, consisting (1) of an internal cone of chamberlets arranged 

 at the apex in a spiral, and afterwards annular, or discoidal, each 

 disc being subdivided into chamberlets by labyrinthic or irregular 

 septa, the chamberlets alternate with those above and below ; 

 (2) of a cortical or external layer of rectangular chambers, partially 

 subdivided by imperfect septa attached to the outer wall of the 

 chamber and projecting inwards. The spire at the apex or aboral 

 end of the test is large and simple, consisting of about one and 

 a half turns, and in some cases the primordial sphere is well shown. 

 The primordial chamber is most frequently megalospheric, measuring 

 about bV inch (■416 mm.) in diameter; one sphere of the microspheric 

 type measures aV inch (-20 mm.) in diameter. 



In vertical section the cone is seen to be divided laterally b}' 

 curved floors parallel with the convex surface of the base. These 

 are subdivided somewhat irregularly by vertical septa iti the 

 central area. Average height of test, A inch (o mm.) ; average 

 diameter at the base, ^ inch (4'16 mm.). 



Affinities. — The present species differs considerably in point of 

 structure from the large Cretaceous PatelUnce, the chief distinction 

 of the latter forms being the more or less hemispherical or spherical 

 shape of the chambers constituting the cortical layer. In the 

 Tertiary speciiiiens the cortical chambers are <leci<ledly rectangular. 



I have lately taUen the o[iportuiiity of examining the specimens 



