400 s. HATTA : 



Teleostei, and I agree with the view of Ruckekt, here represented 

 by tliat of MoLLiER. 



MoLLiER and Field agree with each other in assigning three 

 pairs of the tubules for Rana and Bufo, extending from the 

 second to the fourth somite, and two pairs for Tnlon (Mollier) 

 and Amhlystoma (Field), covering the third and fourth somites/' 

 In addition to these, Mollier observed occasional occurrences of 

 the third tubule in Triton, ^Yhicll is, according to Field, not 

 equivalent, as Mollier maintains, to the third tubule in Bufo 

 and Rana, because the additional third tnbule in Tnlon is fonnd 

 in tlie fifth somite, while the third tubule in Rtana and Bufo is 

 under the fourth somite. According to Semox, there are ten 

 pairs of the tubules on either side of the body in Ichthyoj)hi>^. 



A pair of glomeruli has l)een made out in Amphibia ; 

 the structure is connected by special vessels with the dorsal 

 aorta on one hand and with the cardinal vein on the other. 

 This branch of the aorta is believed by Field to correspond 

 to a part of Mayer's vessels in Selachia. Beside these, there is 

 no vessel arranged segmentally or otherwise. 



The section of the body-cavity corresponding to the pro- 

 nephric stretch is gradually expanded, and is shut off temporarily 

 from the rest of the cavity by a close contact of the parietal 

 and visceral layers of the cœlome ; this part of the cavity is, 

 according to Goette, homologous with the pronephric chamber 

 in Teleostei and with the homologous structure in Peiromyzon, 

 wdiich is called by him the '* peritoneale Scheidewände." 



The so-called ventral portion of the Amphibian pronephros 

 is, according to Mollier, brought about by the separation of 



1) According to FielDj Mollier's first body-segment in Tiiton corresponds to his third 

 somite in Amblyslonia. 



