68 ^Ir. H. J. Carter on Carpenterla monticularis. 



VII. — On the Branched Form of the Apertu7'al Prolongation 

 from the Summit of Carpenteria monticularis. By H. J. 

 Caetee, F.R.S. &c. 



In my paper on Foraminifera (' Annals/ 1877, vol. xix. pi. 

 xiii. fig. 11) I have represented what appeared to me to be 

 an embryonic form of Carpenteria monticularis , besides two 

 forms of the matured test (fig. 9, a, h) ; and by referring to the 

 former it will be observed that there is a tubular prolongation 

 of the aperture from the summit, whose margin (or, at least, 

 that portion of it which remains entire) shows that it was 

 inflated i. e. thickened and rounded, as in the aperture of 

 Polytrema miniaceum (' Annals,' 1876, vol. xvii. pi. xiii. 

 fig. 6, c, &c.). 



In the figure of the matured form [a) the margin was also 

 inflated and smooth, while that of " h " presented a jagged 

 edge, from which a portion had evidently been broken off. 



Just now, on a small branch of Oculina rosea {loc. un- 

 known), I have met with a matured specimen of Carpenteria 

 monticularis like that of ''a" (l-c), in which the aperture 

 is prolonged into a tubular form that at first divides into two 

 branches, one of which has been broken off just after the divi- 

 sion ; but the other, which remains, may be assumed to indi- 

 cate what the former might have been. After a certain 

 distance the remaining branch sends off three divisions, two 

 of which have been broken ofi', while the third extends 

 upwards for some distance, where the jagged form of its extre- 

 mity also indicates that this is not its original termination, 

 which probably had an inflated smooth margin. Thus in 

 this specimen of Carpenteria monticularis the tubular pro- 



Carpenteria monticularis, X 8. 



longation of the aperture at the commencement divided into 

 two branches, which were afterwards subdivided (see wood- 

 cut, magnified about eight diameters). 



By its side was another matured form like " h " {I. c), in 



