74 W, ARCHER, 



form a kind of crown around it^ each apex showing an 

 agglomeration of contracted granular sarcode, lending a con- 

 siderable amount of resemblance to certain Podophryans. 

 The author, to account for this phenomenon, was disposed 

 to assume the presence of an extremely hyaline, though 

 imperceptible, gelatinous envelope surrounding the appa- 

 rently naked body, preventing the abrupt retraction of the 

 whole of the pseudopodia and causing the agglomeration of 

 the granular substance at its periphery. 



But, as Avell as the examples as above described, others 

 occurred with a distinct outer covering, and at the same time 

 Other alterations were perceptible, possibly indicating a 

 resting condition jDreceding a subdivision. A perfectly 

 pellucid gelatinous envelope directly and everywhere sur- 

 rounds the body, permeated by fine dark parallel lines pro- 

 ceeding from the stipes and becoming lost in the body- 

 sarcode. A more advanced stage could be seen in other 

 cases in which a layer of delicate fine strongly refractive 

 plates could be recognised on the surface of the gelatinous 

 investment (fig. 27). By degrees these seem to become 

 thicker ; their contours, however, not yet marked out by the 

 more evident, presently showing themselves as solid, 

 tolerably regularly hexagonal plates. Taken altogether, they 

 form an aiDproximately globular, ovoid, or pyriform case, 

 prolonged into a similar coating down the stipes. It is 

 striking that these plates do not touch by their lateral mar- 

 gins, at least the author always saw clear intervening narrow 

 zones, which could only be interpreted at intervals 

 between isolated plates or as thinner parts of a continuous 

 membranous coat. Owing to their withstanding concen- 

 trated sulphuric acids the author concludes they are sili- 

 ceous. Whether when fully formed the old stratum of 

 gelatinous substance still remains the author could not satisfy 

 himself. 



Further modifications consisted in the subdivision of the 

 nucleus, regularly preceded by an elongation, an assumption 

 of a biscuit-shaped figure and final breaking up into two 

 portions, each surrounded by its own special hyaline envelope 

 (fig. 27). The two newly-formed nuclei now recede from one 

 another. At the same time the pseudopodia may remain 

 quite unaltered and fully extended, even though the distinct 

 rudiments of the plates were present (fig. 27). But Avith 

 the further develojiment of the plates the pseudopodia 

 became wholly retracted, and at the same time the little 

 dark globular central body disappears. From the latter 

 circumstances the impediment to the nucleus attaining the 



