Towards the end of the month a great number of black pear-shaped bodies (Stentor niger), visible to the naked eye, were conspicuous in some water from the Kentish Town ponds. Upon examination they were found to be filled with granules that were red by reflected, and purple by transmitted light. Each one had a spiral wreath of cilia, with a mouth situated like those of the stentors, hereafter to be described, but none of them became stationary, and in a few days they all disappeared. Stein divides Ehrenberg's Stentor igneus from S. niger; the creature described seems to have agreed with Stein's _igneus_, which he describes as having blood-red lilac, cinnabar, or brown-red pigment particles, and as much smaller than his S. niger. In the same water were specimens of that singular Rotifer, the _Salpina_, about 1--150" long, and furnished with a _lorica_, or carapace, resembling a three-sided glass box, closed below, and slightly open along the back. At the top of this box were four, and at the bottom three, points or horns, and the creature had one eye and a forked tail. Keeping him company was another little Rotifer, named after its appearance, _Monocerca rattus_, the 'One-tailed Rat.' This little animal had green matter in its stomach, which was in constant commotion. I ought to have observed that the Salpina repeatedly thrust out its gizzard, and used it as an external mouth. In the annexed sketch the Salpina is seen in a position that displays the dorsal opening of the carapace. Its three-cornered shape is only shown by a side view. [Illustration: Salpina redunca.] Here we close a brief account of what March winds brought in their train. The next chapter will show the good fortune that attended April showers. CHAPTER V. APRIL. The beautiful Floscule--Mode of seeking for Tubicolor Rotifers--Mode of illuminating the Floscule--Difficulty of seeing the transparent tube--Protrusion of long hairs--Lobes--Gizzard--Hairy lobes of Floscule not rotatory organs--Glass troughs--Their construction and use--Movement of globules in lobes of Floscule--Chætonotus larus--Its mode of swimming--Coleps hirtus--Devourer of dead Entomostraca--Dead Rotifer and Vibriones--Theories of fermentation and putrefaction--Euplotes and Stylonichia--Fecundity of Stylonichia. Few living creatures deserve so well the appellation of "beautiful" as the _Floscularia ornata_, or Beautiful Floscule, although to contemplate a motionless and uncoloured portrait, one would imagine that it exhibited no graces of either colour or form. Mr. Gosse has, however, done it justice, and the drawing in his "Tenby" is executed with that rare combination of scientific accuracy and artistic skill, for which the productions of his pencil are renowned.