Recent Researches on the Infusoria. 307 



Such are the principal forms of the teeth of the Rotatoria, to 

 which class of Infusoria, until lately, Dr Ehrent)erg supposed 

 them to be confined. By a recent improvement of his micros- 

 cope, however, he has succeeded in discovering a distinct pha- 

 rynx and teeth in the Loocodes CucuUtdtts, which belongs to the 

 Polygastrica. 



Explanation of Plate I. ; the figures are all much magnified. 



Fig, 1, Philodina eryihrophthalma^ showing thg double rotatory 

 organ^ behind which is the process named calcar or spur, 

 and the two eyes. 

 2-6. Show the forms of the alimentary canal in the Rotatoria, 

 viz. 



2. Trachelogastrica from Chaetonotus maximus. 



3. Coeldgastrica from Euchlanis macrura. 



4. 5. Gasterodela, viz. 



4. From Enteroplea Ht/datina, showing the supposed biliary 



vessels connected with the oesophagus. 



5. From Diglena lacustrisy a. oesophagus, bb. two pancreas- 



like bodies, ccccc, five coeca connected with the stomach. 



6. Trachelocystica from Philodina roseola, 



7-10. Show the forms of the alimentaiy canal in the Polygas- 

 trica, viz. 



7. Anentera from Monas Atomus. 



8. Cyclocoela ft-om Vorticella citrina, 



9. Orthocela from Enchelys Pupa, 



10. Campylocoela from Leucophrys patula. 



11. Eosphora Najas, The three red spots placed anteriorly 



are the eyes, two being on the fore part of the head, and 

 one in the neck. The alimentary canal is filled with 

 carmine. 



12. Eudorina elegans, with the young inclosed, their eyes ap- 



pearing as a red spot. 



13. Microglena monadina, and 



14. Microglena volvocinOi showing the eye, which appears like 



a red spot. 



15. Lagenula euchlora, with its transparent covering or lorica, 



and single red eye. 



16. Distigma viride, seen in three different shapes ; its eyes re- 



semble two black points. 



u 2 



