SPIRILLUM. . 277 



an explanation which M. Morren considers somewhat hazard- 

 ous, although not improbable. As to the phenomenon of the 

 Red Sea, by the fact that its extent has impressed apon it a 

 character of majesty calculated to affect strongly the imagin- 

 ation of the vulgar, it ought to produce still more sensation. 

 Since now we know the origin of it, if we compare together 

 the immensity of this phenomenon, and the infinite smallness 

 of the being which produces it, one cannot divest oneself 

 from a profound sentiment of admiration for the Omnipotence 

 which effects such great ends with such feeble means." 



Section i. 

 Filaments not enclosed in gelatine of a definite form. 



32. SPIRILLUM Ehr. 

 Char. Filaments spiral, ceruginous green. 



1. SPIRILLUM JENNERI Hass. 

 Plate LXXV. Fig. 5. 



Char. Filaments rather thick, each being usually composed of 

 about eight or ten regular spiral coils. Striae distant, per- 

 ceptible. 



Hob. Tunbridge: Mr. Jenner. 



This is the finest species of the genus. I have not seen a 

 pure specimen, those sent me by Mr. Jenner being mixed 

 up with different species of Oscillatorice. 



2. SPIRILLUM RUPESTRE. 

 Plate LXXV. Fig. 6. 

 Char. Filaments slender, regularly spiral. 

 Oscillatoria spiralis Carm. 



Hab. On rocks by the seaside where the birds are in the 

 habit of resting, Appin : Capt. Carmichael. 

 T 3 



