178 K0L1.1KER, ON VEGETABLE PARASITES. 



5. Orbitolites complanata. (Fig. 6.) 



Ten vertical and horizontal sections of this genus all con- 

 tained numerous fungi, generally speaking of the same two 

 kinds as in Amphistegina. In general the wider canals were 

 the more numerous, and these also presented frequent dila- 

 tions, and were more serpentine than in the last-named genus. 

 The parasites were in this case also situated more in the 

 superficial layers of the shell, though some penetrated through 

 its entire thickness. Numerous young fungi were seated in 

 the walls of the chambers, in the layers immediately bound- 

 ing them, in the form of pedunculated, roundish, and pyriform 

 vesicles. 



6. Polystomella. 



Nine sections of shells of this form all contained numerous 

 fungi of the same two kinds as those in Amphistegina. Young, 

 undeveloped individuals might also be observed. 



7. Alveolina Boscii 



Contained numerous, far finer fungus-filaments, with some 

 of greater size. Numerous young forms. 



3. Anthozoa. 



In the great division of the Anthozoa, the calcareous 

 skeleton of the stony corals is very frequently pervaded by 

 fungi, whilst in other divisions of the class I have not yet 

 certainly met with any parasites. My researches have 

 hitherto been extended only to the following genera and 

 species : 



(a) Porites clavaria 



Contains numerous, moderately-branched, fine and coarser 

 fungus- filaments, from 0-002 /// to O0025'", or even 0003'", in 

 diameter, and veryoften supporting sporangia. These occurred 

 only in the thicker filaments, and appeared to be rarely or 

 never only terminal, but some always lateral as well. So that 

 one filament of this kind would often be seen supporting 

 4 to 6 or even 8 to 10 sporangia in tolerably close appo- 

 sition. In a few instances the lateral sporangia were shortly 

 pedunculate. 



(b) Astreea annularis (fig. 8) 

 Presents the same form of fungus, also abundantly fur- 



