456 



Tin-: AMKh'lC.W \.\ TrRALlST [Vol. XLI 



pleura and am al)le so far to testify to tlie correctness of (rold- 

 sehmidt's observations. On the other hand Metcalf finds some 

 eviden(^e of metamerism in the rapheal nerve of the Molguli(Ue, 

 Perhaps these facts sh'trhtly support Perrier's view that the aikilt 

 sedentary simple ascidian is nearest to the vertebrate ancestor 

 and that consequently Aj)p(Mi<licularia is a modified ascidian larva. 



Seeli^rer and .Metcalf doubt that there is a true homol()(iy between 

 the tunicate and vertebrate hypophysis. Xeither docvs Seeliirer 

 believe the vertebrate thyroid to be related uviici k ally to the iinii- 

 cate endostyle. 



Lar<rcly from the character of the stiu'niaia and the ahseiKc of 

 an epi<..rdimn, Julin hold, a ^bMlite,ann."an .pe- ie> < alle.l In him 



A. K. intra-'la.. kin.hi|,.. perhap. nnd.inu' of oreuler uvneral 

 interest iia-. come m liuht (hiin)i: the decade than that ( )ctacnenms 

 is an ascidian i)roper and has nothinu- to do with the Salpidte. 

 Metcalf and Hitter have made this positive. 



The ])olvphvletic character of the eompoun.l ascidians is now 



