A. E. Lechmere. 
198 
Mycelium consists of stout, robust hyphae, often standing up 
above the water-level, in some cases as much as 75/x thick, yet 
always more lax at times of oospore formation. 
Sporocysts are borne terminally on the main and lateral hyphae; 
they are club-shaped or cylindrical, vary very much in thickness 
and length, but are always rather thicker than the supporting 
hypha. After the discharge, upgrowth of the hypha occurs 
repeatedly, forming nested sporocysts. 
Oocysts are borne singly on the main or lateral branches ; they 
are spherical or pear-shaped, with many fairly large spots on the 
smooth coloured wall. The oocysts are sometimes cylindrical and 
may be formed within a discharged sporocyst; they usually contain 
many oospores, hut occasionally specially small oocysts are formed 
which only contain one oospore. 
Oospores, spherical, smooth, concentric, 20—27 g diameter. 
Resting period, 45—92 days. Germination by means of germ tube 
or sporocyst formation. 
Antherocysts and antheridial filaments entirely absent. 
A table is given below showing a comparison of the variations 
which exist between the various species composing the Ferax group 
(with the exception of S. hypogyna and S. anisospora, which have 
special characteristics) and the Species 11., under investigation. 
General Remarks on the Affinities of Species II. 
Taking into consideration the general characters shown in the 
life-history of Species II., it will be seen that a very close relation¬ 
ship exists between it, S. dioica, S. Thureti, and 5. tomlosa. 
Points of resemblance between Species II. and the genus 
Apodya have already been referred to and seem to be in this case 
more of the nature of a chance variation than having any specific 
value. 
The points of resemblance between Species II. and S. tomlosa 
are the following: — 
1. Occurrence of oocysts in rows and singly. 
2. Wall of oocyst not spotted. 
3. Special small oocysts with one oospore. 
4. Occurrence of gemmae. 
5. Older hyphae show septation into segments. 
