ON THE ANASPIDACEA, LIVING AND FOSSIL. 539 
purely of trophic cells (Pl. 12, fig. 16). The lower portion of 
the duct has a thick epithelial wall with oval granular 
nuclei, and these cells produce an albuminous material that 
is cast into the lumen of the duct and solidifies round the 
TErxt-Fic. 41. 
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PAPAS NHANES 
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41. 
Anaspides tasmaniz. Testis and vas deferens of one side. 
spermatozoa to form the spermatophores. here is a thick 
muscular layer surrounding the lower part of the vas deferens. 
In the section (Pl. 12, fig. 16) the top of the spermatophor, 
with its albuminous coat, is cut across. 
The spermatozoa are filiform elongated bodies with a con- 
