336 THK rRlNO-OENITAI. SYSTEiM, THE ADRENALS, ETO. 



of the kiduev are usually inoiv or less coloured with a i^-olden- 

 yellow pii>-uieut. Aiionliuii- to Tornier it hears short cilia (Fig-. 

 21 8 XIV). 



The thin! portion corresponds with the narrow limh of Henle'ii 

 loop; it is lineii with eiliattHl epithehum (Fi^;-. ^uS A'lII, d to r), 

 similar to that in the neck of the tnhe. 



The fourth portion (Flo^. 218 Y III, c to </, and XIII) repre- 

 sents the wider limh of Henk^'s loop. It has a winding- eourse 

 in the ventral part of the kidney, and then ascends dorsally to 

 open into a eollectino--tnbe. The fourth part of the tube is lined 

 with a short, columnar epithelium (Fig-. ai8 A'lII, c to d), which 

 has a clear, I'uticular, free bonier, larg'e nucleus, and a peeuliar 

 ari-ang-ement of the protoplasm, which shows a rod-like structnre 

 (:Figv. 21 8 XI). 



The collect ing'-tnbes course transversely near the dorsal surface 

 of the kidney (Fig*. 217), and the nriniferous tubes meet them at 

 rig'ht-ang-les. They are lined with a short ]>olviional einthelium 

 (Figv. 218 VII). 



The peritones»! funnels of the kidney ^nephrostomes^. Spengel, Meyer, and 

 Hortiuann desoribo these funnels as existing in the frog ; acooriiing to them they 

 open on the ventral snrtV.oe by narrow apertures, and eaoh is connected, by a vertical 

 tubule, with tlie fourth jvsrt of the uriuiferous tul>e ^SpengeD, but according to 

 Nussl\sum, with the neck of the tube. Accoi-ding to Spengel and Meyer the number 

 of tliese funnels is in Kaua from J50 to 360. 



Acconiing to AViedersheim the funnels hang free from the ventral surface like so 

 m.<»iiy jij^rasites att:iched by tine filaments, and do iiof open on the surface. 



Heidenh.ain (Arvh. f. niik. Anat., Vol. X^ was unable to find these organs. 



Being unable to find any trace of these organs in the kidneys of either K. tempo- 

 rari» or K esculeuta, in micn^scopic sections or in teased prejxirations, I inserted 

 cauulae int\^ the ureters of botli male and female specimens of both species, and 

 injected iJie nriniferous tubes with a solution of Berlin blue. Although the tubules 

 were, in some cj»*es, completely injected, in no case could I find any trace of a 

 peritoneal funnel, nor was there any escape of the solution from the kidney as would 

 be the case if the funnels were oj>en and communicated with any part of the nri- 

 niferous tubes. Even when the pressure was increased to the exT<?nt of a column 

 of 35 cm. high of the injection-mass, no escape took jilace fh^m tlie surface of the 

 kidney, though in numerous e.<ises the nriniferous tubes were ruptured by the abnor- 

 mally high pressure. 



Properly dissected fi\igs were placed in o-6 '^ , sodium cliloride solution, in which 

 finely divided gamboge w.-ts suspende<.i. Xo trace of ciliary action was, in .\ny ciise, 

 found on either surface of the kidneys. 



One m.sy therefore conclude thai if the j^eritoneal funnels exist in the adult frc^ 

 {1) they are very difficult t<> find : ^j' they do not form a free communicating path 

 between any jiari of the uriniferous tubes and the abdominal cavity ; (3^ their 

 superficial terminations have no free cilia. As before stated I have found no 

 trace of anv such organs. 



