The Histogenesis of Cysticercus pisiformis. 253 



Fig. 36. Capillary cell and tube from bladder wall, the latter termi- 

 nating blindly at either end, 1000 : 1. 



Fig. 37. Two developing flame cells and capillary from bladder wall. 

 1000: 1. 



Fig. 38. Portion of excretory ducts from neck of larva, with com- 

 municating capillary. The budding of the latter is indicated at x. 1000: 1. 



Fig. 39. Two developing flame cells and capillary cell — cc from 

 neck of larva. The excretory duct, e is here cut taugentially. 1050 : 1. 



Fig. 40, Four developing flame cells from neck of larva. 1000:1. 



Fig. 41. Commencement of excretory duct in bladder wall. Communi- 

 cating with the rudiment of the duct is a developing capillary into which 

 open two flame cells, one of which is represented only by the tip of its 

 ciliate process and funnel. The capillary cell is also shown. 1000 : 1. 



Fig. 42. Portion of excretory duct in neck of larva, with communi- 

 cating capillaries and three developing flame cells. 1000 : 1. 



Plate 10. 



Fig. 43. Developing neuro-muscular cell from bladder wall. 1200 : 1. 



Fig. 44. Developing muscle from bladder of larva. 1200 : 1. 



Fig. 45. Portion of sub-cuticula from posterior neck region of larva, 

 showing termination of a neuro-muscular cell on two of the sub-cuticular 

 muscles. 1000 : 1. 



Fig. 46. Portion of sub-cuticula of Taenia serrata. Note the cell, 

 2", which is probably dividing. 1000: 1. 



Fig. 47. Sub-cuticula of Taenia serrata. 1650 : 1. 



Fig. 48. Portion of sub-cuticula of neck of Taenia serrata, x an- 

 astomosis of sub-cuticular and parenchyma cells. 1200 : 1. 



Fig. 49. Portion of sub-cuticula of Taenia serrata. Note the an- 

 astomoses of sub-cuticular cells ; also the mass of cytogenetic protoplasm, 

 mcif. 1000 : 1. 



Fig. 50. Section of wall of larva from posterior neck region, showing 

 termination of a neuro-muscular cell on one of the sub-cuticular muscles. 

 1000: 1. 



Fig. 51. Section of bladder wall. 1000:1. 



Plate 11. 



Fig. 52. Enlargement of three cells indicated at x^ in Fig. 65. 

 2200 : 1. 



Fig. 53. Enlargement of neuroblast indicated at x in Fig. 65. 2200 : 1. 



Fig. 54. Neuron from immature proglottid of Taenia serrata. 2850: 1. 



Fig. 55. Two neurons from main lateral nerve cord in neck of larva. 

 1000: 1. 



