244 TRANS. OF THE ACAD. OF SCIENCE. 
mid with five salient and five retr renting angles, the | 
angles being directly opposite the extr the in 
Pieces stand over eac 
uniting with peas fellows of the opposite side at the salient 
n sl of the pyramid. 
| these se thageetdions there would:seem to be but little 
doubt that the summit openings are closed in all the forms of 
the genus Pe entremites, whether they belong: t to the 
/ Truncati, or Clavati. 
e circumstane 
