. The biology of the frog . FlG. 54. — Diagram of a kidney show-ing the ureter and collecting , collecting tubules; L, longitudi-nal canal of Bidder; S, seminalvesicle; T\ testis; U, ureter; VE,vasa efferentia. THE EXCRETORY SYSTEM 205 stance of the kidney, and the spermatozoa are carried throughthis organ to the ureter, which thus serves also as a vasdeferens. Thevasa erTerentia areoriginally out-growths of thewalls of the Mal-pighian corpus-cles which be-come connectedwith the some species(R. escu lento)the Malpighianbodies, which giverise to these out-growths, still pre-s

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. The biology of the frog . FlG. 54. — Diagram of a kidney show-ing the ureter and collecting , collecting tubules; L, longitudi-nal canal of Bidder; S, seminalvesicle; T\ testis; U, ureter; VE,vasa efferentia. THE EXCRETORY SYSTEM 205 stance of the kidney, and the spermatozoa are carried throughthis organ to the ureter, which thus serves also as a vasdeferens. Thevasa erTerentia areoriginally out-growths of thewalls of the Mal-pighian corpus-cles which be-come connectedwith the some species(R. escu lento)the Malpighianbodies, which giverise to these out-growths, still pre-serve their originalfunction, and dur-ing the period ofsexual activityspermatozoa maybe seen in themas well as alongthe whole lengthof the renal tu-bules which arisefrom them. Thevasa erTerentialead into a longi-tudinal canal {Bidder s canal) which runs near the medianedge of the kidney. In Ranafusca, according to Beissner, this canal is con-. C/3

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