148 



PROF. W. N. PARKER ON THE LEFT POSTERIOR [Mar. 1 &, 



valuable suggestions to me by letter on this subject, for lie could 

 not believe that the two so-called " venae cavse posteriores " were 



Fig. 2. 



pre. 



rj>r.e 



.■&c2. 



Ir- 



A 



jjI.cz 



W} 



-Led 



v.v 



-C.V 



Dicaeram of the chief veins of Profoptcrm annectens. From the ventral aspect. 

 (N.B.— Tlie veins from the bocly-vi'alls and generative organs are omitted.) 



c.t', caudal vein; /«.«', hepatic veins : ^^ kidney ; /.c(^, left cardinal ; /r, liver ; 

 2)r.c, precaval ; pt.c \ hepatic portion of postcaval ; ft.c '-, renal portion 

 of postcaval ; jj.v, pelvic vein ; r.p, renal portal vein ; s.cl, subclavian. 



really the cardinals. Although my observations on Protopterus 

 do not point to a paired origin of the postcaval, as indicated by 



