BY H. LEIGHTON KESTKVEN. 295- 



Plate xxvi. 



Fig.l. — Sidneioides tamaramce Kestv. ; section of ovary. 



Fig.2.— ,, ,, ,, anterior end of zooid. 



Fig. 3.— ,, ,, ,, a test-cell. 



Fig. 4. — ,j ,, ,, portion of thorax. 



Fig.5. — ,, ,, ,, colony from above. 



Fig.6.-- ,, ,, ,, portion of a colony, from the side. 



Fig. 7. — Dendrodoa gregaria Kestv.; branchial wall. 



Fig. 8. — Molgida mortoni Kestv.; branchial wall. 



Fig, 9. — Corella valentince Kestv.; branchial wall. 



Fig. 1 is reproduced from a drawing on a faint bromide print, from a 

 microphotograph which, together with figs. 5, 6, 7, 8 and 9, were taken for 

 me by Mr. Louis Schaeffer, of the Anatomy Department. 



Plate xxvii. 

 Fig.l. — Dendrodoa gregaria Kestv.; outline of body removed from the test, 



seen from the right. 

 Fig.2.— „ ,, ,, outline of body removed from the test, 



seen from the left. 

 Fig.3. — ,, ,, ,, outline of complete specimen. 



Fig.4.— ,, ,, ,, outline of complete specimen. 



Fig.5.— ,, ,, ,, half branchial sac, from within. 



Fig.6. — Corella valenti7iceKest\. ; showing the situations of the parts seen 



in and through the branchial wall. 

 Fig. 7.— ,, ,, ,, body removed^from the test, dorsal aspect. 



Fig. 8.— ,, ,, ,, body removed from the test, ventral aspect. 



Fig.9.~ ,, ,, ,, complete specimen. 



Fig. 10. — ,, ,, ,, complete specimen. 



Fig. 11. — Molgida mortoni Kestv.; body removed from the test, seen from the . 



left. 

 Fig. 12.— ,, ,, ,, half branchial sac, seen from within. 



Fig.13.— Cionot intestinalis Linn., var. sidneiensis Stimpson; anterior end of 



body removed from the test, seen from the left. 

 Fig.H.—Oiona intestinalis Linn., var. sidneiensis Stimpson; dorsal tubercle 



and related parts. 

 Y\g.\6.—Ciona intestinalis Linn., var. .sirf»etewsis Stimpson ; body removed 



from the test, seen from the right. 

 Fig. 1 6. —Ceowa intestinalis Linn., var. sidneiensis Stimpson; body removed 



from the test, seen from the left. 



YxgAl.—Ciona intestmalis Linn., var. sidneiensis ^txmT^son; diagrammatic 



outline showing situations of gonad, vas deferens and alimentary 



canal. 



Fig. 18. — Ciona intestinalis Linn., var. sidneiensis Stimpson; dorsal languets. 



Fig. 19. — Ciona intestinalis Linn., var. sidneiensis '&i\m^s,on; branchial wall. 



