IN THE MUD OF THE LEVANT. 43 



from the centre, passing through the elastic skin, 

 or we should surely have found some traces 

 of perforations in the latter, through which they 

 could have been projected. Besides, it accords 

 much more with what is presented by the other 

 inferior animals— to regard the true cuticle as 

 investing, in one form or another, all the super- 

 ficial extension of the organism. This is the case 

 in the long and beautiful pseudopodia of the 

 Beroe, to which the analogous organs in the 

 Foraminifera bear some slight resemblance. 



Fig. 28 represents what 1 have frequently 

 found in the Levant deposit, as well as elsewhere, 

 and what I believe to be the same species as 

 fig. 26, in an advanced stage of growth. In the 

 young state, the cells preserve the spiral arrange- 

 ment ; as the growth advances, the new cells 

 become less regular in their form, and ultimately 

 appear to be arranged without any order what- 

 ever ; the later cells have also, invariably, two 

 large orifices, one at each end, giving them the 

 shape and appearance of a number of small 

 Cypres fixed upon the back of the Rosalina, — the 

 two orifices being analogous to the communica- 

 tions through the septa, which connect the various 

 segments of the soft animal at an earlier stage of 



