476 MB. p. W. PHILLIPS ON A 



wise. Eor it is not possible that any animal should be able to 

 ascertain the direction of a source of smell, unless the animal, 

 being freely locomotive, is able, by moving about, to perceive the 

 differential intensity of the olfactory sensation as it approaches 

 or recedes from such a body. But a Sea-anemone, being sta- 

 tionary, has no opportunity of thus distinguishing the direction 

 from vs^hich the odour is proceeding ; it can only be affected by 

 the odour as this occurs pretty equally diffused around its own 

 organism. 



Note on a new Ciliate Infusorian allied to Pleuronema. 



By Feedeeick W. Phillips, F.L.S. 



[Bead June 15, 1882.] 



Caltptoteicha *, n; gen. 

 Animalcules loricate, sedentary, more or less ovate or pyriform, clothed 

 with flexible, non-vibratile, setose cilise. Oral apertui-e ventral. A vibra- 

 tory membranous hood or velum. Contractile vesicles and nucleus pre- 

 sent, and trichocysts in cortical layer. 



Caltptoteicha PLEUEOiraiMoiDEst, u- sp. 



The adult form provided with an elongo-ovate, transparent, hya- 

 line lorica, opening teat-like at both ends. Body-cilia about two 

 thirds the body in length, with shorter, stronger vibratile cilia at 

 entrance of velum ; the velum almost equal to the ventral length. 

 Nucleus centrally situate, and two rhythmically contractile 

 vesicles present. Anterior extremity of body protrusible from 

 lorica. Length '001 inch. 



Hah. Pond-water. 



The above-named animalcule, which is now described for the 

 first time, was found attached to Myriophyllum, obtained from a 

 pond near Hertford. At first sight I thought it was an embryonic 

 or encysted stage of some monad ; but upon applying a magnify- 

 ing-power of some 900 diameters, I observed that it possessed a 

 singular vibratile membrane, closely resembling that which cha- 

 racterizes the members of the family Pleuronemidse. 



I observed that the animalcule was of an ovate form, the body 

 being clothed with numerous long, flexible, but non-vibratile 

 cilia, of a setose character ; that the membranous trap, or velum, 

 which in form resembled the old-fashioned poke-bonnet, con- 



* KaXvTrros, veiled or covered ; 0pi|, hair. 



f Trivial name in allusion to its resemblance to the gemis Tleuronema. 



