Van Name. — Simple Ascidians 
PLATE 52. 
Fig. 48. Caesira arenata (Stimpson). Left gonad and outline of intestinal 
loop. X 9. 
Fig. 49. Caesira arenata (Stimpson). Right gonad and outline of kidney. 
X9. 
Fig. 50. Caesira retortiformis (Verrill). Dorsal tubercle of medium-sized 
individual. X 10. 
Fig. 51. Caesira retortiformis (Verrill). Large tentacle from rather large 
individual. X 17. 
Fig. 52. Caesira retortiformis (Verrill). Left gonad and intestinal loop as 
seen from side next to branchial sac. X 6. 
