Manchester Memoirs, Vol. ii. (1907), No. 9. 15 



angle formed by two chambers of a Milioiina. A few 

 are upon what appear to be thin pieces of shale. 



There is no doubt in my mind that the free specimens 

 found have all been adherent. 



These specimens, like the one figured, have, generally 

 speaking, the floor intact, but in one or two cases this 

 floor has come off, and reveals very perfectly what a 

 curious dissolving-out of the chambers of the central shell 

 has taken place. Fig. 8, of PI. 3, shows this shell viewed 

 from the underside. The underside of the central test is 

 almost level with the edge of the encircling chamber, and 

 is simply supported in its place by the arched props which 

 spring from the sides of the front part of the central 

 shell ; all the internal walls of the chambers being dis- 

 solved, leaving only the back and front, on which the 

 sutural lines are still to be seen. In all cases where the 

 test has become detached and the floor broken, this 

 condition is revealed ; when the floor remains, and is clear 

 enough to see through, either dry or when damped, I 

 think it is likewise present, at any rate to some extent. 

 The arches supporting the back of the shell are not 

 always as regular as in the example chosen for illustra- 

 tion. The dotted lines in fig. 9c. give some idea of the 

 position of the floor, or underside of the test. To prevent 

 confusion I have not indicated the arches. Brady in the 

 Challenger Report ('84), p. 563, refers to this breaking up 

 of the chamber walls in Polymorphina angnsta, Egger. 

 In a note at the end of this part, reference will be made 

 to this peculiarity in the Polymorphinae found at Delos. 

 At Palermo this form is minute and very rare. Rather rare. 



*Polymorphina spinosa, d'Orbigny, sp. var. (PI. 3, 

 figs. 10, 11.) 

 Globulina spinosa, d'Orbigny ('46). p. 203, pi. 13, 

 figs. 23, 24. 



