392 EXTERNAL ANATOMY OF INSECTS. 



3. Furca (the Fork). An inflected elastic anal organ, 

 ending in a fork, by which the animal is enabled to 

 leap a . Ex. Podura. 



4-. Styli (the Styles). Rigid, exarticulate, long and 

 narrow anal organs b . Ex. Staphylinus. 



5. Foliola (the Leaflets). Rigid, exarticulate, dilated, 



leaf-like anal organs c . Ex. Libellulina. 



6. Flosculus (the Floret). A small, tubular, lunulate 



anal organ, with a central style d . Fidgora cande- 

 laria, &c. 



7. Cerci (the Cerci). Two short, flatfish, sublanceo- 



late, jointed, lateral anal organs e . Ex. Blaita. — 

 N.B. Analogous organs are observable in the Gryl- 

 lina, but usually conical and without joints f . In 

 Gryllus Latr. they are setiform s . 



8. Caudul^: (the Caudtdce). Two or more slender, fili- 



form or setaceous, jointed, flexile anal organs h . Ex. 

 Lepisma, Machilis, Ephemera. 



9. Fila (the Threads). Two exarticulate, slender, fili- 



form anal organs '. Ex. Machilis. 



10. Mammulje (the Mammulce). Anal protuberances, 

 containing instruments for spinning web k . Ex. 

 Araneidce. They include the Fusi. 



11. Fusi (the Spinners). Organs, consisting of two re- 

 tractile pieces, issuing from the Mammtdce, and ren- 

 dering the threads '. 



■ Plate XV. Fig. 14. M" . b Ibid. Fig. 17- N" . 



' Ibid. Fig. 15. 0" . «• Ibid. Fig. 13. P" . 



p Ibid. Fig. 23. Q". 



f De Geer iii. t. xxii ./. 10. a a. 8 Ibid. I. xxiv./. 2. c; and/. 11. 



h Plate XV. Fig. 16. R" . * Ibid. S" . ' * 



* Ibid. Fig. 10; and Plate XXIII. Fig. 16, 17. T " '. 



> Ibid- Fig. 12. B". 15. 



