V. linearis minutissimus. Very small linear vibrio.
This is one of the most minute animalcula, surpassing in slenderness the monas termo, [No. 1]. The greatest magnifier exhibits little more than a tremulous motion of myriads of little oblong obscure points. In a few days it almost fills the whole substance of the water in vegetable infusions.
53. Vibrio Rugula.
V. linearis flexuosus. Vibrio like a bent line.
Myriads of this species may be found; it is between the vibrio lineola, just described, and the vibrio undula, [No. 55]. It appears as a little line, which is sometimes drawn up in an undulated shape, and moves backwards and forwards in a straight line, often without bending the body at all.
54. Vibrio Bacillus.
V. linearis, æqualis utrinque truncata. Linear vibrio, equally truncated at both ends.
This is an exceeding small creature, but visible with the third lens; in a certain position of the light, transparent. It is gelatinous, and not half so large as the monas lens, [No. 5], though six, and sometimes ten times longer; it is everywhere of an equal size, and has no visible intestines; its action is languid, the serpentine flexures of the body are with great difficulty perceived. Müller made two infusions of hay in the same water, and at the same time, in the one he put the hay whole, in the other it was cut in small pieces; in the first there were none of the vibrio bacillus, but many of the monas lens and kolpoda cucullus, [No. 108]; in the latter, many of the vibrio bacillus, and few of the monæ.
55. Vibrio Undula.
V. filiformis flexuosus. A filiform flexuous vibrio.