84 D. BRYCE ON A NEW CLASSIFICATION OF THE BDELLOID ROTIFERA. 



was thread-like, when I know how particularly he w^as interested 

 in the structure of the alimentary canal and in the appear- 

 ances presented when the rotifers w^ere fed with indigo or other 

 pigments. 



2. Callidina rediviva, as stated above, was clearly a pellet - 

 maker, and had a stomach with a wide lumen. It had two teeth 

 on each ramus, and some resemblance to Philodina roseola in colour 

 and form. It occurred in sand from a rain-water gutter in 

 Ehrenberg's house. These details were given in 1838. At a later 

 date, 1848 (7), Ehrenberg states that the colour is brick-red and 

 that the body is spindle-shaped. The two-toothed pellet-makers 

 known to-day are comparatively few. The above particulars 

 apply best in my opinion to Hahrotrocha hideiis (Gosse), which 

 has the spindle-shaped body and a superficial resemblance to 

 F. roseola ; but I have never seen it of a reddish colour, but always 

 colourless or nearly so. To legard the two forms as identical 

 on such faint particulars and resemblance would not, I think, 

 be satisfactory. 



3. Philodina hirsuta, Ehrenberg, wrongly ascribed to 

 Pritchard by Janson (38), appears to have been accepted by the 

 last author solely upon the faith of its supposed recognition by 

 Anderson (30), who in turn seems to have been misled by a 

 ludicrous error in Pritchard's Infusoria (1861 edition). In 

 Ehrenberg's description the spurs are thus described : " Pedis 

 corniculis dorsualibus praelongis," the phrase meaning in modern 

 terminology " Spurs very long," but translated in Pritchard 

 as " Foot prolonged by dorsal spines." Anderson remarks that 

 the foot is not prolonged by dorsal spines, and figures a species 

 with quite short spurs, which cannot possibly be the species seen 

 'by Ehrenberg. If Fhilodina commensalis of Western be really 

 viviparous as described (of which I have doubts) it is possible 

 that it is a rediscovery of the original P. hirsuta, as not only 

 does it fit the few particulars given by Ehrenberg, but I have also 

 seen it partially covered with hair-like bodies, noticed both by 

 Ehrenberg and by Anderson on their respective species. It is 

 now well understood that the supposed " down " does not really 

 appertain to the rotifer, but is a parasitic fungoid growth, either 

 a species of Cladothrix or allied thereto. A similar growth was 

 seen on examples sent to me of A7ioino2)us telphusae, which, like 

 P. commensalis, is itself of parasitic habits. 



