12: 



)•> 



ions. HOYK PKIKHSEN 



cf. Gerncck 1. c. Tal). \I, li}». 29, 30) I have loimd a distincl coiistriction 

 at oni' end in all llie t-ells, which iiulicales liial Ihe wall is composcd 

 of twi) valves ol" vcrv (liircronl size as in Ophiocutiuiu. in tlie ciilliiros 

 I »iflen t'ound eniply cclls Ironi which ihe s|)()res had csca|)ed, and in 

 cerlain cases Ihe small 'lid* was Ihen Ivin"« bcside Ihe rest of the wall 



Fig. 3'i. Riimilleriopnis bretyis (Gern.) 



Priiitz. F'rom cultiire of soli sample. 



(X 1200). 



Fig. 3;}. Bumillcriopsi.'i brevis 

 (Geni.) Priiitz. From .sample 17i). 

 [X 1200). 



(Fig. 32c). Thus there can hardly be any doiibt that the cell wall in 

 this species has in reality the same structure as that of Ophiociitiuin 

 cf. Gerne ck 1. c. Tab. XI, fig 27 . 



Chlor-zinc-iodinc does not stain the wall which, consequently. does 

 not contain any cellulose. 



In sample 17i) Fig. 33^ the cells olien had a somcwhat diircront 

 appcarance. there being a slight constriction and a small thickening of 

 the wall at both apices. This was perhaps the beginning of a simple 

 cell division which I also saw ellccted. Occasionally the two daughter 

 cclIs were curvcd as shown in fig. 33 d, but most frequcntly tlicy wcre 

 in line with each otlier. Tiiey were not always of c(|ual size. often the 

 division would give rise to a long and a short cell. In sample 179 I 

 saw no sporulation, which niay perhaps be due to the faet that most 

 of the rells seemed to be in the lesting stage, being (illed with nnmerous 

 clear dro|)s which turned out not lo be fat, but more i)robably, as 

 mentioned above, was the same substance which was found by Piercy 

 in Hormiditun fhucidiim 1. c. . 



In ils entire structure Huniillerio|)sis brevis bears a striking resem- 

 blance to the iMuhezellen'i oi Cunfcrixi described and ligured by Lager- 

 heim (1889. p. 204 f., Taf. VI, fig. 53.) This would seem to indicate a 

 close relationship with thai genus, Ihough 1 do not think liial Biimil- 

 leriopsis can be regarded as a developmental stage of Conferua. 



