A Rotifer New to Britain. 49 



animation it will be seen that along the slender maxillary pro- 

 jection there exists on each side a row of minute teeth which, 

 on a small scale, bear no distant resemblance to the lateral 

 teeth on the snout of the saw-fish, and which are very thickly 

 projecting along the border on each side, with their points 

 directed a little downward. 



The ordinary length of this fish is about a foot, but not un- 

 frequently it is seen a few inches longer ; the shape inclined 

 to round near the head, more compressed along the body, and 

 tapering towards the tail. The head flattened above, the jaws 

 protruded, the lower jaw longest, upper jaw the most slender. 

 Scales rather large, but easily lost ; and then the general colour 

 becomes green where in the perfect state it is a light blue. 

 Lateral line obscure ; the belly with a low ridge along each side- 

 Eye lateral, conspicuous ; nostril in front of it open. The peo 

 toral fin is broad at the base, pointed above ; dorsal and anal 

 fins far behind, nearly opposite, and close behind them five 

 finlets above and the same number below ; but I have seen six. 

 and even seven finlets above and below. Central fins small ; 

 tail forked. There is a row of minute blue dots along the border 

 of the first gill-cover, seventeen in number, which appear to be 

 the orifices of mucous-glands. 



A ROTIFER NEW TO BRITAIN— (CEPHALOSIPHON 



LIMNIAS). 



BY PHILIP HENRY GOSSE, P.R.S. 



In the admirable new edition of Pritchard's " Infusoria" (p. 670), 

 Professor Williamson has included in the family Floscularicea, 

 between the genera Limnias and Lacinularia, a genus named 

 Cejphalosiphon, with the following brief characters : — " Rotary 

 organ bilobed : eyes two; sheath single; two frontal horns, 

 including the siphon." One sole species is mentioned, thus 

 characterized : — " C. limnias. Sheath membranous, annulate, 

 1—6".' to 1—5"'. On Ceratophyllum. Berlin, July." 



As no references are given to any authority, I wrote to 

 Professor Williamson for further information, suggesting that 

 for " including," we should probably read " inclosing." I was 

 favoured with the following note in reply : — 



" I am afraid I can give you no information respecting it. I 

 found it in the last edition of 'Pritchard,' and from the habitat 

 (Berlin) I concluded that it had been one of those genera established 

 by Ehrenberg, which he has scattered broadcast through half the 

 journals of Germany. Hence I did not feel at liberty to omit it, 



VOL. I. — NO. I. E 



