JOURNAL OF MICROSCOPICAL SCIENCE. 



DESCRIPTION OF PLATE III, 



Illustrating the Rev. W. Houghton's Remarks on the Glossi- 

 phonidse, a family of Discophorous Annulata. 



rig- 



1. — Diagram illtistrating the digestive and intestinal apparatus of a Glos- 

 siphon : ar, stomachal caeca ; b, intestinal cseca. 



2> — ^Diagram showing a portion of the great dorsal Vessel, with the valve- 

 like processes and branching channels. 



3. — Tubular proboscis of Glossiphonia complanata, magnified about 20 

 diameters. 



4. — Portion of the same, magnified 350 diameters. 



5. — Cup-shaped plate from the neck of G. bioculata, magnified 25 diameters. 



6. — Nervous system of a Glossiphonia : c, cephalic portion ; b, a portion 

 from themiddle of the body. 



7. — Glossiphonia complanata in the act of incubatingj magnified 3 diameters. 



8. — A colony of parasites, Epistylis (?), common on the cervical plate of 

 G. bioculata. 



9. — Entozoan infusoria, from intestine of a Glossiphonia. 



10. — A young Glossiphonia, showing the red caeca, slightly magnified. 



11. — Generative system : a, b, c, male organ; d, e,/, female organ. 



12. — Ovary with attached vitelli, magnified about 4 diameters. 



13. — Vitelli, natural size. 



14. — Portion of the membranous covering (ovisac ?) of the ovary, with the 

 latter contained in it. 



15.-- G'. marffinata, magnified 4 diameters. 



16. — Diagram, showing (a) large contractile dorsal vessel ; b, lateral vessels 

 c, vessels leading from b to the margin of the body. 



17. — Spermatozoa: «, hedge-like mass ; ^, free spermatozoa. 



Note. — I am indebted to R. Chattock, Esq., of Solihull, for the drawings 

 (from my rough sketches) on the accompanying plate. 



