Five New Floseules, &c. By Dr. Hudson. 163 



close to the buttress ridges, are the two eyes. It requires a httle 

 care and patience to get a sight of them, as they are of only a pale 

 pink and are frequently obscured by other parts of the animal. 



It is easy to see the true rotatory organ which consists, as 

 usual, of a ciliated horseshoe-shaped rim at the base of the mouth- 

 funnel and on the ventral side of it, and which is continued in two 

 long curved lines down the vestibule to the lips. The contractile 

 vesicle is unusually large and plain, and in all the specimens which 

 I have seen it contained a cluster of yellow globules, which appeared 

 black by transmitted hght. 



As Mr. Hood asked me to name this rotifer, I thought I could 

 not do better than name it after himself, not only because its very 

 shape suggested it, but also because it seemed only right that of 

 the five very remarkable rotifers that Mr. Hood has discovered, at 

 least one should bear his name. 



F. amhigua. (Plate IV. fig. 1.) 



F. arribigua was discovered by Mr. Hood on Sphagnum in a 

 mossy pool on Tent's Muir near Luchars in May 1881, and by 

 Mr. Bolton in September 1881 near Birmingham. Since then 

 Mr. Hood has found it in Loch Eea near Blairgowrie Perthshire, 

 on a coarse species of Chara, along with (Ecistes Janus. 



This is the least elegant of all the Floseules ; it is broad and 

 stumpy, and its trochal disk appears at first sight to have but three 

 lobes. There are however besides the three larger lobes two 

 shghtly raised setigerous eminences on either side. 



Like F. Hoodii it has two semi-transparent dorsal ridges 

 running up from the body to the dorsal lobe. These indeed exist 

 in some degree in all Floseules, but are unusually prominent in the 

 two above-named species. 



Its body is generally thrown into coarse transverse folds at the 

 lower extremity, so as to make quite a well-marked separation 

 between itself and the foot, the latter appearing to possess but 

 half the width of the body at the point where it joins it. At 

 various points across the body, and especially round the base of the 

 mouth-funnel, there are usually several thick corrugations obscuring 

 the internal structure. The creature's habits are curious, and have 

 been so well described by Mr. Hood in a communication to myself, 

 that I cannot do better than give his own words : — 



" This Floscule is not a beauty, but what it wants in grace it 

 gains in interest, for it is most amusing to watch it feeding. As 

 soon as it has fuUy expanded its large head, infusoria of various species 

 may be observed to be drawn swiftly down the large cavity formed 

 by the lobes. The inward-setting current thus formed by the cilia 

 at the base of the cavity seems to be stronger in F. amhigua than 



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