92 



No. 15. Nachet and Son's microscope, one-half inch objective, 

 owned by H. F. Shepard, of Salem. Object, perpendicular section of 

 Dermal Teeth of Saw Fish (Pristis). 



No. 16. French microscope, one inch objective, owned by H. F. 

 Shepard, of Salem. Object, longitudinal section of Tooth of Skate 

 (Raja). 



No. 17. Oberhaeuser microscope, one-half inch objective, owned 

 by Dr. Benjamin Cox, of Salem. Object, Mouth-parts of Humble Bee 

 (Bombus^). 



No. 18. Griinow microscope, two inch objective, owned by A. 

 Hyatt, of Salem. Object, Mouth-parts of Butterfly (Papilio). 



No. 19. Wooden stand, maker unknown, one-half inch Tolles' ob- 

 jective. Object, Mouth-parts of House Fly (Musca). 



No. 20. Small French microscope, owned by Charles Stodder, 

 of Boston. Object, Mouth-parts of Horse Fly (Tabanus). 



No. 21. Fraiinhofer microscope, simple model, one inch objective, 

 owned by Dr. Henry Wheatlaud, of Salem. Object, Mouth-parts of 

 Male Mosquito (Culex). 



No. 22. Oberhaeuser microscope, modele No. 2, one-half inch 

 objective, owned by John Cummings, jr., of Woburn, Object, Mouth- 

 parts of Female Mosquito (Culex). 



No. 23. Nachet, first class, one-half inch objective, owned by Rev. 

 J. A. Swan, of Kennebunk, Me. Object, Mouth-parts of Tiger Beetle 

 ( Cicindela) . 



No. 24. Nachet microscope, one inch objective, owned by Dr. 

 A. H. Johnson, of Salem. Object, Mouth-parts (Labium) of a Cock- 

 roach (Blatta). 



No. 25. Oberhaeuser microscope, modele, No. 2, one-half inch ob- 

 jective, owned by Dr. W. L. Bowdoin, of Salem. Object, Mouth-parts 

 (Maxillae) of a Cockroach (Blotto). 



No. 26. French dissecting microscope, owned by Essex Institute. 

 Object, entire specimen of Water Bug (Ectobia'). 



No. 27. Oberhaeuser microscope, petit modele, one-half inch object- 

 ive, owned by Dr. William Mack, of Salem. Object, Rows of Teeth 

 lining the stomach of the Cricket (Aclieta). 



No. 28. Microscope made by R. B. Tolles, one-half inch objective, 

 owned by S. H. Scudder, of Boston. Object, Mouth-parts of White 

 Ant (Termes'). 



No. 29. Mouth-parts of Shrimp (Pandalus), separated and mounted 

 on a large glass slide, to show their relation to corresponding parts 

 in the insect. 



No. 30. Microscope made by Charles A. Spencer, one inch object- 

 ive, owned by Dr. Wells, of Elliot, Me. Object, Mouth-parts of Leech 

 (Hirudo'). 



