UNPRESSED MOUNTING FOR MICROSCOPE. 129 



(a) 2 claws and scopula 



(/^) 3 claws 



(c) more than 3 claws 



(d) 3 pairs of spinnerets 



(e) 4 ditto 



(/) 2 branchial vents 



(^) 2 branchial and 2 trachaeal vents. 



EXPLANATION OF PLATE XIL 



Fig. 1. — Diagrammatic section of Spider's abdomen, showing the silk- 

 glands and other organs in situ, a, Spinnerets ; 6 c, Silk- 

 glands ; d, Pulmonary leaflets ; e, Pulmonary chamber ; 

 /, Heart ; g, Pericardium ; /(, h, Vessels which return the 

 blood to the heart after aeration ; k, Anal outlet ; I, Ovary 

 containing eggs. 



,, 2. — Female of Dolomedes mirahills, carrying her cocoon attached 

 to the breastplate. 



,, 3. — Spinnerets of Cinifio atrox, 4 pairs. 



,, 4. — Ditto of Agelena labyrintliica, 3 pairs. 



,, 5. — Long, 3-jointed spinneret of ditto, side view, showing 

 spinning-tubes. 



,, 6. — Foot of Tegenaria civilis, with 3 claws. 



,, 7. — Ditto Epeira dladema, with 3 large and several subsidiary 

 claws. 



,, 8. — Foot of Scdticus scemcus. with 2 claws and scopula. 



,, 9. — Hind-leg of Cinifio, with calamistrum in situ. 



,, 10. — Calamistrum, more magnified. 



'\Ilnpre06eJ) flftountino for tbe HDicroecope^ 



By Alfred W. Stokes, F.C.S. 



BLUE-BOTTLES are still in season ! At every window, with 

 very little or very great panes, the microscopist, on that 

 happy hunting-ground, may meet the buzzing monster. 

 There are few cabinets in which " the Tongue of a Blow-fly " is 

 not to be found ; it haunts the boxes of " The Postal Microsco- 

 pical Society " with painful regularity ; go to any soiree, and you 

 will, with certainty, through some brazen tube, see the blow-fly 

 putting out his tongue at you. Most books on the microscope 



