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 corpuscule of the //ustra 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. 
Pirate XXXVI. 
Fic. 6. Carbasaria fimbriata, group enlarged. 
7. Specimen magnified. 
13. ANIMALCULUM cRUCIATUM.—Plate XXXVI. Fig. 8. 
A very minute shuttle-shaped Animalculum has been seen among 
the ova of the Lumbrieus 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. 
Prats XXXVI. 
Fic. 8. Animaleulum cruciatum, magnified. 
14. Cercarta.—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. 
Pirate XXXVI. 
Fie. 9. Cercaria, magnified. 
