ANALYTICAL INDEX. 353 



CHAPTER X. continued. 



6. NEREIS PHASMA, The Spectre Nereis, . PAGE 259 

 Difficulty of obtaining distinct views of a living subject per- 

 plexes observers, .... 260 



Discovery of specimen in a vessel of sea- water, . . ib. 



So transparent as to be scarcely perceptible Mr Syme, ib. 

 Other specimens, . . . . .261 



Animal described, ..... ib. 



Is colourless, ...... ib. 



Swims horizontally, ..... ib. 



The Briarean scolopendra of Quoy and Gaymard bear resem- 

 blance to it, . . . . 262 



Plate XXXVI. explained, . . . ib. 



8. OCTODACTYLUS INHjERENS, .... ib. 



Strange that life shall only be sustained at the expense of life, ib. 



This parasite infests the gills of the ling, . . 263 



Description, ...... ib. 



Twenty-nine specimens removed from the gills of a ling, ib. 



Plate XXXVI. explained! . . . . ib. 



9. SPH^RULA, ...... 264 



This animal seems to have no place in the Systema, . ib. 



Its form, organs, &c., .... ib. 



Motion extremely slow, . . . . . ib. 



10. ANIMALCULA, ..... ib. 

 The Animalcula infusoria form the greater portion of this class, ib. 

 Their minuteness obstruct observation, . . 265 



11. MELICERTA RINCJENS, . . . . ib. 

 This minute animal may prove one of the Annelides, . ib. 

 Form described, . . . . . ib. 

 The tube, in which it dwells, tapers upwards, . . ib. 

 Found in fresh-water lakes, . . . ib. 

 Plate XXXVI. explained, .... ib. 



12. CARBASARIA FIMBRIATA, . . . . . ib. 



Resembles a Planaria, .... ib. 



Description, . . . . . .266 



Is a beautiful animal, .... ib. 



Plate XXXVI. explained, . . . . ib. 



13. ANIMALCULUM CRUCIATOM, .... ib. 

 Shuttle-shaped Animalculum found among the ova of the 



Lumbricus cirratus, .... ib. 



VOL. II. d 



