Mr. H. J. Carter on Carpenteria moiiticularis. 69 



which the tubular prolongation was also divided into two 

 branches, hoth of loMcli had been broken off; while close by 

 are several embryonal forms of Polytrema mintaceum^ Avhich 

 also end respectively in an erect tubular prolongation of 

 the aperture, terminated by an inflated and everted margin 

 like that of fig. 6, c (/. c), whose form, at first single, be- 

 comes multiplied as the Polytrema increases in size. 



The erect, branched, tubular extension of the aperture in 

 C monticularis therefore shows what Max Schultze had 

 anticipated when he modestly said: — "Perhaps my obser- 

 vations on Polytrema^ which indicate the remarkable affinity 

 between that genus and Carpenteria^ ^^^J serve to shake 

 Carpenter's faith in his opinion " (' Annals,' 1863, vol. xii. 

 p. 419). 



The entire tubular extension of the aperture in G. monti- 

 cularis to which I have alluded is a little more than 1-1 2th 

 inch long, l-45th inch in diameter at the fixed end, and 

 l-138th inch in diameter at the free extremity of the ultimate 

 branch, which, as before stated, has been broken otf. 



It first commences in an undivided portion, about l-36th inch 

 long, which then bifurcates, when one of the branches is 

 broken off", but measures, like the other at this point, l-72nd 

 inch in diameter. The branch which has not been broken off 

 is then continued on for l-50th inch, when it sent off a branch 

 which is now indicated by a projecting aperture with inflated 

 margin, that may or may not have ever been longer than it 

 now is ; just after which the continuation of the tube divides 

 into two other branches of unequal size, one of which, viz. the 

 largest, has also been broken off just after the bifurcation, 

 where it is l-72nd inch in diameter, while the other is con- 

 tinued on for about l-33rd inch, when it also ends in a broken 

 extremity where the wall of the tube is about l-1800th inch 

 thick and the tube itself l-138tli inch in diameter, which, 

 from this diminished size, I should think, must have been 

 .very near its original termination. 



The tubular branched prolongation is cylindrical and circu- 

 lar throughout, and increases gradually in the thickness of 

 the wall as well as in the diameter of the tube from the free ends 

 to the fixed one. Moreover it is more or less filled with linear 

 spicules, some of which appear to be incorporated longitudi- 

 nally with the inner part of the wall of the tube ; while 

 throughout also it is sparsely punctate with the tubulation 

 common to the foraminiferal test. So that altogether C. mon- 

 ticularis thus bears a considerable resemblance to Polytrema ; 

 and commencing in the embryonic form (fig. and I. c.) with a 



