W. B. CARPENTER ON THE STRUCTURE OF ORBITOLITE8. 



97 



Species. Mr. Darwin had not at that time given his views to the 

 world ; but when he read the conclusions I had arrived at, he said 

 that he not only agreed with them, but was disposed to go a good 

 deal further. It was by this previous enquiry that I found myself 

 prepared, when the " Origin of Species " was published, to accept 

 all its main positions as scientifically tenable. 



The next stage was made in the course of the Porcupine expedi- 

 tion in 1869, when, from 1,200 fathoms' depth off the west coast 



Fig. 9. 



1. Disk of Duplex Type of Orbitolite (0. duplex). 



2. Edge of disk, showing double row of marginal pores. 



3. Central portion of sarcode body : — a, primordial segment ; b, circum- 

 ambient segment, budding off a half-ring of sub-segments, from which 

 complete rings are afterwards formed. 



4. Portion of the sarcodic body of one ring ; a a J and b b 1 , the two halves 

 of the columnar sub-segments in connection with c c', the annular cord ; 

 from this are given off the pairs of stolon-processes d d', d d', which con- 

 nect it with the sub-segments of the next annulus. 



