34 MICROSCOPICAL OBJECTS FOUND 



Some of the genera, instead of having but one 

 series of necks or processes connecting the soft 

 animal contents of the various cells together, 

 have several, which also communicate with the 

 exterior by means of a corresponding number of 

 foramina in front of the last cell, some in the 

 centre, some in the circumference. Alcide 

 d'Orbigny was well acquainted with this fact, and 

 it is surprising that it did not lead him to see the 

 error of resrardino; these animals as Nautili. He 

 was also acquainted with the pseudopodia, as he 

 says, " L'aiiimal fait sortir des filamens non 

 seulement par les ouvertures du dessus de la 

 derniere loge, mais encore par les pores des cotes 

 des dernieres loges."* He still, however, re- 

 garded these creatures as possessing an exsertile 

 head, with a plumose feeling and prehensile appa- 

 ratus, as is the case with the larger Cephalopoda. 



In addition to the distinctions already noticed 

 between the Foraminifera and the Nautili, espe- 

 cially that of the soft animal filling every cell in 

 the former, whilst in the latter it merely occupies 

 the terminal one, there are two other marked 

 characters, which separate the Polythalamia from 

 the Cephalapoda. One is, that while the septa 



* Voyage clans TA'Tieiique Mevulionale. Tome Sierne, p. 29- 



