156 



TXVKIiTEllKATE ANIMALS. 



simply for lining (heir luilutations. For the production of the web, 

 Spiders are furnished with special glands situated at the extremity 

 of the alidoiuen. Tlie s(.'cretion of these glanils is a viscid fluid, 

 which hardens rajnilly on exi>o.s\ne to air, and which is cast into 

 its proper threa.d-like shape liy passing tlirougli wliat nre called the 

 " siiinnercts." These are little conical or cylindiical organs, from 



Mg. lOt.-A, Thr iiia'i' nf l.lic [■niiiiiKMi I [niisi'-S| mli'i' {Triji' II nr', H cirilin) (-(.iisiil.TaMy 

 iiiiignilhM ; .■ Kiniil ]ini-|inii (if tlji' liiiily, L'uiisistiii- ,.f thr ainalgaliialeil lirad :m'\ 

 111, I, ax; ji .Maxillary ral|a; a AlulmiHMi. I!, r-'r.iiit |inith,ii of thp hrad of tlir 

 saiiir, siMAiiiig llir (M:4lil rjrs {,/") ami tlia Ilia 11,1 i I ilrs ( ,; -. C, Ullil,'!- si.l." ,if (ll,' llvail 

 ami trunk, .slNUvhi- 11,,, tnir jans (in). III,, l,,u,,r li|i (/), ami tlic li.iniy l.lafp t,i 

 wliirh 111,, l,x,s air a I taili,,!. D, Tii.ipiaiii ,,f ,>iir ,,f 111,, air-c-liaiiil.c'vs iir lirpafliing- 

 i.r-aiis. (I-'Iks. A, II, ami C. ■.,,■(■ altrr IrarkMall.) 



two to eight ill iiuinlicr, |il.ared ,'it the I'lid of the alidonien, and ]ier- 

 forated hy .a iiiiniliei- of extremely iniiude Inlie.s through which the 

 secrcUo]! of (lie gland h;is to p,ass liefore reaching tlic ail'. jNlany 

 Spiders, howevi'i', do not constrnet ;iii\' wcli, unless it lie for their 

 own h,a,liitations, lint simply hunt their prey" for thcmsehes. 



Tile S|iiders an, osipiiroiis, .and their young |i,-iss thi'ongh no 

 iii,'l:iiitor|i!iosis, lint they (,ast, their skin or "moult" rejieatedly 

 liel',,!-, they attain tile s)/.e of t'le adn!t. 



