J. G. WALLER ON PARASITIC VEGETABLE ORGANISMS. 357 



As I have refrained from classifying many of the objects 

 amongst known species of the Fungi, it may be useful at least to 

 make some provisional arrangement, which future investigators 

 may use or improve upon with better or more extended knowledge. 

 I have therefore consulted Mr. H. J. Carter, and have adopted 

 his suggestions and improvements. Leaving the question then 

 whether the objects are to be finally arranged with Fungi or Alga3, 

 it is proposed to include them under a general term, expressive of 

 the conditions in which they are found, viz., as parasitic organisms 

 excavating in calcareous matter, organic, or inorganic. 



Entolithe^e. 



lacune.e. pi. xiii. 



Organisms excavating globular, or subglobular, or flask-shape 

 conceptacles, having a pore or ostiolum, which often becomes 

 obsolete in maturity. Some without an ostiolum, some bearing 

 external sporangia. Some confluent, all composed of a granular or 

 mucilaginous substance, generally of a deep yellow. Spores glo- 

 bular, of a pale brown or yellow colour. Sometimes with a theca (?) 

 athwart the conceptacle, which has a mean diameter of 1000th of 

 an inch, and is sometimes seated on mycelia radiating from it. 

 (Lacuneas. L. globosa, mihi.) PI. XIII., Figs. 1, 2, 3, 4, 5, 6, 7,8, 9. 

 (The same. L. sporangifera, mihi.) Do., Figs. 12, 13, 14, 15, 16. 

 (The same. L. ampul loeformis, mihi.) Do., Figs. 17, 18, 19. 

 (The same. L. confluens, mihi.) Do., Figs. 20, 21, 22, 23. 



Retespore^e. PI. XV., Figs. 1, 2. 



Globular surface, making a network of spores in maturity, some- 

 times seated on a thallus : a warm yellow colour. It has a dia- 

 meter of 1000th of an inch. Only one species discovered, and in 

 the Galloper Sand. 

 (Retesporeas. R. Galloperi, mihi.) PI. XV., Figs. 1, 2. 



In referring the next examples to the SaprolegnieaB and Achlyese, 

 I have been guided by the general descriptions given and well 

 known. As some obscurity of their true plan and even separation 

 from each other is felt, 1 submit the classification with reserve. 

 (? Achlyeas. A. perforans. mihi.) PI. XIV., Fig. 1, 4. 

 (? The same. A. villosa, mihi.) Do., Figs. 2, 3. 

 (? The same. A. quadradiata, mihi.) Do., Fig. 5. 

 (? The same. A. simplex, mihi.) PL XV., Fig. 9. 



