Mie ROSCOPTC al Ess ays. 501 



A {lender gelatinous little animal, in the form of a long ferpen- 

 tine line, all the bendings being nearly equal in fize, and at equal 

 diftances ; it generally moves in a ftrait line ; an interline may be 

 difcovered down the middle. It is to be found in river water, 

 but is not commonly to be met with. 



5.7. Vibrio. Spirillum, 



Vibrio filiformis, ambagibus in angulum acutum tornatis.. 

 Filiform vibrio, twilled fomething like a fpiral wire, or cork- 

 fcrew ; the bending acute. 



It is an exceeding minute fmgular little creature, twilled in a< 

 fpiral form ; the Ihape of thefe bendings remains the fame even 

 when the animal is in motion, not occafioned by any internal; 

 force, but are it's natural fhape. It moves generally in a ftrait 

 line, vibrating the hind and fore-part. It was found in 1782, in 

 an infufion of the'fonchi arvenlis. 



58. Vibrio Vermiculus. 



Vibrio tortuofus gelatinus. This little vibrio is twifted and 

 gelatinous. 



The body is white, or rather of a milky appearance, eylmdric,. 

 long, the apex obtufe, rather growing fmaller, and twitted 

 towards the hind-part. It's motion is languid and modulatory, 

 like that of the common worm ; it fometimes moves quicker, but 

 with feeming labour. When it bends itfelf alternately from one 

 fide to the other,, a black long line may be difcovered, fometimes 

 m •■ whole;, 



