TYNDARIDEA. 161 



dochrome, ichich near the period of conjugation exhibits a 

 somewhat stellate arrangement. Sporangia circular, not 

 producing any material change in the primary form of 

 the cell. 



Conjugata cruciata Vaucher, Hist, des Conf. pi. vi. fig. 4. ; 

 pi. vii. fig. 2. p. 77. 



Hab. Cheshunt: A.H.H. 



I have but little doubt that this is the Conjugata cruciata of 

 Vaucher. It is the finest of all the Tyndaridea I have met 

 with. It is not common : and I have only once obtained it 

 with the sporangia formed. 



2. TYNDARIDEA ANOMALA Ralfs. 

 Plate XXXVIII. Figs. 2, 3. 



Char. Filaments smaller than those of T. cruciata. Cells in 

 the young state usually about as long as broad, densely 

 filled with endochrome, and invested with a broad and 

 very apparent mucous sheath; in a more advanced con- 

 dition the threads become narrower, the slteath smaller, 

 and the endochrome more scattered, and sometimes even 

 stellated ; finally, the sporangia are formed, which are 

 circular, and protrude slightly into the tubes of commu- 

 nication of the filaments. 



T. anomala Ralfs, MSS. 



Hab. Penzance and Dolgelly : Mr. Ralfs. High Beech : 

 A. H. H. In a boggy spot near Cross in Hand, oppo- 

 site to where the road branches to Hailsham ; Barcombe, 

 in Sussex, and Weston Bogs, near Southampton: Mr. 

 Jenner. 



This remarkable and somewhat anomalous species was first 

 discovered by Mr. Ralfs, who submitted it to the examination 

 of several friends. For a long time, however, doubts were 

 entertained by many as to whether it really was a Tynda- 

 ridea or not ; doubts which I myself, in common with others, 

 for a period entertained, but which I was happily enabled to 



M 



