Mycetomorpha. 593 



Explauatiou of tlie Figures. 



hr protoplasmic bridles connecting n. c nerve cord of host 



ovarian follicles with septa o. f ovarian follicle 



ch chitinous cuticle of ectodeim ooc oocytes 



eh. ped chitinous ring surrounding oog oogonia 



peduncle jjJi phagocytic cells of Cypris larva 



ect ectoderm of mantle ret reticular tissue of Cypris larva 



ed' ectoderm of visceral mass r rootsystem 



emb developing eggs h granulär substance secreted by 



emb. c embryonic cells of Cypris larva the glands of the visceral mass 



ej) surface epithelium of Cypris larva scp septa of visceral mass 



/. m longitudinal musculature of the ftp chitinous spike given off from 

 host, Crangon peduncular ring 



m. c mantle cavity rac vacuole 



m. d mantle duct y residual yolk iu Cypris larva 



onu muscles 



Plate 15. 



Fig. 1. Ventral view of the shrimp Crangon covuminis with its 

 parasite Mycetomorplia vancouverensis. 3:1. 



Fig. 2. Lateral view of the sarae : the right pleurae and appendages 

 of the first two abdominal Segments have been removed to show the 

 attachment of the parasite more plainly. 3:1. 



Plate 16. 



The figures in this plate refer entirely to Mycetomorplia. 



Fig. 3. Upper surface o{ Mycetoiiiorpha detached from its host: the 

 visceral mass and mantle duct are shown as seen through the mantle wheu 

 the larvae have been removed from the mantle cavity. 5:1. 



