5) 



100 SELECTED NOTES FROM THE SOCIETY'S NOTE-BOOKS. 



Plate III. 



Upper Portion. 



Fig. 1. — Transverse section through the small intestine of mouse. 

 X 20. 



2. — A single villus. x 100. 



3. — Diagram of part of the extremity of a villus, showing, c. e. , 

 conical epithelium ; a. , artery ; i'. , vein ; c. , capillaries ; 

 I. , lacteal. Drawn by Tutfen West. 



Lotver Fortiori. 



Fig. 1. — Egg of Cheyletus, 2/3rd in. objective, and A eyepiece. From 

 Science Gossip. 



,, 2. — Head of Cheyletus eruditus, $ , showing muscles, etc. 

 /. , falces ; n , rostrum ; r. r., retractor muscles of rostrum ; 

 e.r., extractor muscles of rostrum. x 143. 



,, 3. — Foot of same, x 425. 



,, 4. — One falx of same, x 250, from a slide in the possession of the 

 writer, showing muscles and comb-like falces more plainly 

 than in Fig. 2.' Drawn by H. M. J. Underbill. 



Plate IV. 



Upper Portion. 



^.— First tarsus of Dolichopus longicornis, x 25. 



B. — First tarsus of another species of Dolichopus, x 25. 



C. — Antenna of Dolichopus longicornis, x 25. 



-D, E. — Diagrams of second and third joints of the same. 



F. — Haltere of Dioctria rujipes, a dipterous insect, showing otoconia 

 at X. 



G. — A few otoconia from haltere of Tachino virgo, a dipterous insect, 

 X 630. Drawn by F. J. Allen. 



H. — Fore-wing-case in pupa of Crane Fly, showing undeveloped wing. 



I. — Hind-wing case of same, containing haltere. 



Lower Portion. 



Fig. 1. — Diagrammatic sketch of the duplicative sub-division of the 

 thoracic segments. 



,, 2. — Sexual segments of Eristalis tenax (male). The several plates 

 are indicated by numerals, followed by the letters v. or cL, to 

 indicate whether ventral or dorsal ; thus, 8y. is the eighth 

 ventral abdominal plate, dorsal aspect. The figure shows the 

 increasing extent of exposure of the sixth, seventh, and 

 eighth ventral plates towards the dorsum. 



,, 3. — The same, ventral aspect, showing diminishing exposure 

 towards the venter of the same segments, and the eighth 

 dorsal plate wholly turned towards the centre. 



4. — The male generative organ and surrounding parts : front view. 



5. — Ditto, side view, marked^, in Figs. 2 and 4. 



6. — Same segments from another slide, similarly lettered for coui- 

 parison. Drawn by A. Hammond. 



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