IX 



X 



XI 



36 T. H. Buhlend, 



End of body 9.32. 



Gut begins 2,4. Foregut ends 4,11. Heart 2,34—4,4. 

 Neurenteric canal 9,23—9,27. (Two gill -clefts open, two nearly 

 open.) 



Kidney on the left side. 



Glomus begins 4,7. 

 VII 4,12—4,14 First tubule opens by nephrostome into coelom. 



{4,19—4,26 Tubule leaves duct at 4,19; opens into coelom at 

 ^^^ and again at 4,26. 



4,31 Nephrostome opening at 4,31—4,33. Possibly a 



rudimentary tubule passing off from duct at 

 4,37. A distinct tubule passes from nephro- 

 stome at 4,31 to open into the duct at 4,39. 



5,1 to 5,8 Incomplete tubule passes off from duct at 5.1. 

 Tubule with coelomic opening at 5,5 and 5.6; 

 open nephrotomic opening at 5,2 and 5,3 ; joins 

 with duct at 5,6 and 5,7, 



5,10 — 5,19 Signs of incomplete tubule extending from open 

 nephrotome towards duct in 5,10 and 5,11. This 

 is closely related with a tubule opening into 

 nephrotome at 5,14 and 5,15, and into duct at 

 5,16 and 5,17. 



5,20 — 5,30 The nephrotome is not open in this region ; there 

 is a tubule opening into the duct with ope- 

 nings into the nephrotome in 5,22 and 5,26. 

 This segment seems to show without doubt meso- 

 nephric tubules. 

 The pronephric duct is fused with the wall of the gut at 8.35 

 and behind this section. 



Kidney on the right side. 



Glomus begins 4,4. 

 VII 4,16 — 4,22 Tubule with opening to coelom at 4,19. 



1 4,28 — 4,31 Tubule with opening to coelom at 4,28 and into 

 ^^^^ \ duct at 4,31. 



(4,37 — 5,1 Tubule opening to coelom at 4,37 and into pro- 

 ^^ \ nephric duct at 5,1. 



XII? 



