14'2 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



Fig. 5. Transverse section of the Scolex passing 

 through the central nervous system. Mag. 

 about 10 dia. 



The figure should be compared with Text- 

 fig. 1, p. 106, which is based upon this and the 

 adjacent sections of the series. 



Fig. 6. Transverse section near the posterior extremity 

 of the animal, and passing through the 

 appendix. The crescentic cavity is produced 

 by the involution of the integument con- 

 sequent on the retraction of the appendix. 

 Mag. 20 dia. 



Fig. 7. Transverse section passing through about the 

 middle of the animal. Mag. 14 dia. 



Plate II, figs. 1-8. 



Fig. 1. Melanotic sarcoma from Rata batis. Round 

 and spindle cells containing melanin 

 granules; diffuse melanin granules; slight 

 connective tissue stroma ; nuclei of cells either 

 modified or normal. 



Fig. 2. The same. Two typical spindle cells. Length 

 about 0"08 mm. 



Fig. 3. The same. Part of the tumour where a break- 

 down of the walls of the blood capillaries has 

 occurred. The darkly shaded cells belong to 

 the sarcoma ; the lightly shaded ones are red 

 .blood corpuscles. 



Fig. 4. The same. Section of a metastasis. The 

 darkly shaded part represents the sarcomatous 

 tissue; on the left, part of the epidermis. All 

 the structures shown belong to the integument. 



