April 37, 1S88.] 



SCIENTIFIC NEWS. 



389 



the first section oi PeneropUs arietinus, Batsch(fig. i), in 

 which at first the chambers grow on a spiral plan, ulti- 

 timately extending in a rectilineal manner, the stolon 

 passages by which the sarcode, or body substance, in 



no perforation of the outer wall of the shell can be seen 

 in this type, as in those of the other division, it appear- 

 ing as a homogenous translucent substance throughout ; 

 hence the name Imperforata applied to these forms. In 



Fig. I. — PeneropUs arietinus. Batsch. 

 Median section, showing 

 stolon passages, x 30. 



Fig. 3. — Biloculina rin- 

 gcns. Lam. Sp. 

 X 30. 



Fig. 2. — Marginulina Wetherellii. Jones. 

 Small portion of tubulated wall. 



Fig. 4. — Spirolocidiiia limbaia. d'Orb. 



Fig. 5. — Miliolina seminulum. Linne Sp. x 30. 



Fig. 



7. — Cormispira in- 

 volvens. Reuss. 



Fig. 



Vcrtebralina striata. 

 d'Orb. X 30. 



each chamber is connected, may be distinctly traced 

 perforating the septum or floor of the latter, passing 

 through that of the first or oldest septum, and through 

 each in succession to the one last formed, which emits 

 the pseudopodia. It is also to be remarked that how- 

 ever high the magnification used in examining a section, 



Fig. S. — PeneropUs pcrtusns. Forsk. x 30. 



the second section (fig. 2) of Marginulina Wdhcrellli 

 the figure of which shows only a portion of the outer wall 

 of the shell, we observe countless striations across the 

 shell-layer; these are the tubules, through which the 

 sarcode filaments pass to the outside. The tubules in 

 this specimen are about tutjs of an inch in diameter. It 



