266 MISCELLANEOUS. 



widely, the orifice being directed somewhat downwards ; the posterior 

 extremity is obtuse. 



This is a beautiful animal, of colour finely variegated, mottled brown 

 and yellow, at first vivid, but fading as the water becomes stale. 



It seems one of the Animalcula infusoria origination, with the de- 

 composition of the corpusculse of the Flustra carbasea. I have seen it 

 under no other circumstances. But they have then occurred, though not 

 very numerously, in successive years. 



From contraction of the body they probably multiply by transverse 

 division. 



PLATE XXXVI. 



FIG. 6. Carbasaria fimbriata, group enlarged. 

 7. Specimen magnified. 



13. ANIMALCTJLUM CRUCIATUM. Plate XXXVI. Fig. 8. 



A very minute shuttle-shaped Animalculum has been seen among 

 the ova of the Lumbricus cirratus, besides one with a ciliated margin, 

 previously described when treating of the Lumbricus itself. 



Here there are no external organs, unless the indistinct appearance 

 of a St Andrew's cross on the back. Colour pale dingy yellow. Motion 

 very slow. 



PLATE XXXVI. 



FIG. 8. Animalculum cruciatum, magnified. 



14. CEROARIA. Plate XXXVI. Fig. 9. 



This is a minute Animalculum, somewhat resembling a Planaria, 

 with an annulated tapering tail. The mouth is an orifice in the centre 

 of the anterior extremity. The body is of mutable form, the tail very 

 extensile, when the rings are almost obliterated. 



Colonies of these animals, like white specks, dwell in fresh-water. 



PLATE XXXVI. 



FIG. 9. Cercaria, magnified. 



