52 Mr. H, J. Carter on the 



(fig. 9, a a), the filaments (fig. 9, h b), and the chalky substance 

 charged with foramhiiferal detritus and grains of glauconite 

 (fig. 9, c), only arranged in a peculiar manner; thus the 

 internal or plane surface of the tangential section (fig. 7) 

 presents a massive veno-reticulated structure of a light brown 

 colour (fig. 8 a), with an equal amount of interstices which 

 are filled with the chalky substance just mentioned (fig. 8, h), 

 thus indicating that the whole sphere was composed of this 

 reticulated structure &c. ; while in some parts the chalky sub- 

 stance under a high power by reflected light may be seen to 

 be pervaded by the myceliated structure also, in the inter- 

 stices of which, as well as in its substance generally, the 

 smallest as well as the largest particles of the foraminiferal 

 detritus and grains of glauconite are imbedded. On the other 

 hand, the massive veno-reticulated structure appears to have 

 been chiefly composed of the filamentous part of the MiUar- 

 elJa (fig. 9, 5 5), which, where the filaments are situated hori- 

 zontally, are easily recognized, that is laterally^ although this 

 of course is not the case where the section has passed through 

 them transversely, so that they are more or less represented 

 "end on" (fig. 9, a a). In this way the central portion of 

 the Parheria has become a solid mass, in which I could dis- 

 cover no traces of its coenenchyma. Thus, although analo- 

 gous in general form to the " calcitic " transformation, it is 

 in other respects perfectly different, inasmuch as the " cal- 

 citic " one indicates a mineral or 2*?«organic change, while the 

 imbedded fragments of foreign matter in the Millarella are a 

 decided evidence of an organic one. 



Of the nature of Millarella when fresh I can only repeat 

 what has been before stated, viz. that it appears to have 

 belonged to some Saprolegnious Alga both in its plastic 

 character and destructive agency — the former indicated by the 

 imbedding in its mycelium of foreign material whose animal 

 forms are perfectly evident, and the latter evidenced by the 

 entire transformation of the coenenchyma of the Parheria into 

 Millarella ; while the latter in its independent existence has 

 been described under the name of '■'' Millarella cantabrigi- 

 ensis " in this periodical (/. c. p. 178)*. 



Further Observations on the ''^Opaque Scarlet Spherules." 



"When I was engaged in describing the " opaque scarlet 

 spherules " which are confined to the chambers and canals of 



* It no w seems to me that the forms of Loftusia persica and Stoliczkiella 

 TheohdJdi are so unlike any that would be produced by Millarella alone 

 that it is not impossible that these organisms respectively might, like 

 Tarkeria, have become invaded by a Millarella. 



