Van Name. — Simple Ascidians. 
Fig. 
Fig. 
43. 
44. 
Fig. 
45. 
Fig. 
46. 
Fig. 
47. 
PLATE 51. 
Caesira robusta, sp. nov. Large tentacle. X 18. 
Caesira robusta, sp. nov. Dorsal tubercle of large specimen. X 
10. 
Caesira robusta, sp. nov. Posterior ends of several internal longi- 
tudinal vessels showing teeth. X 18. 
Caesira robusta, sp. nov. Left gonad of large specimen with outline 
of intestinal loop. X 6. 
Caesira robusta, sp. nov. Right gonad of large specimen with 
outline of kidney. X 6. 
