80 H. HEATH and M. H. SPAULDING, Anatomy of Corolla spectabUis Dall. 



Fig. 10. Diagram of the accessory reproductive organs, alb al- 

 bumen gland, mu muciparous gland, ovd oviduct, sr seminal receptacle, 

 ut uterus. 



Fig. 11. Pericardial cavity, heart and kidney, c.a cephalic artery, 

 e outer kidney opening, Jc kidney, p. c pericardium, v. a visceral artery, 

 vn ventricle; two lobes of the stomach, against which the heart rests 

 are shown. 



Fig. 12. Longitudinal section through the visceral mass showing 

 the oesophagus (oe), stomach with three teeth in position, intestine (cut 

 across in three places), bile duct and liver {li) which is coated by the 

 gonad (g). On the left the heart (ht) is shown within the pericardium 

 behind which the kidney sinus (s) and the glandular part of the kidney 

 are shown. An arrow indicates the inner connection between the 

 muciparous and albuminiferous glands. 



Fig. 13. Early stage in the development of one of the marginal 

 fin ocelli, g.c ganglion cell and nerve fibres, l.c lens cells, r,c retinal 

 cells. 



Fig. 14. Later stage in ocellus development. Some of the lens 

 cells show darkly staining swollen nuclei. 



Fig. 15. Still more advanced stage in the formation of ocelli. 

 nu nucleus partially degenerated, v.n last stage in the vacuolization of 

 nucleus. 



Fig. 16. Fully formed ocellus. Some of the lens cells in de- 

 generating condition still persist while others have entirely disappeared 

 leaving a fluid that fills the lens cavity that is surrounded by sheath 

 cells (s.c). 



