105 



disintegrating cells ol" voluin, some ol' which have been eaten, 

 are not represented, x u60. 



Fig. 25. Transverse section of larva. From a specimen 

 in which the luoi was i:ioru iru L rac tod tii-a:; in iij. 24, The 

 ventral r.iantle edre is filled with cells gorged with materi- 

 al, evidently for the I'apid growth or the shell -^ -^ its 

 transformation, x JGO. 



Fig. 26. Horizontal section of specimen in which the 

 cavity of the velvim was partially obliterated. On the left 

 side the contents of the gland of Deshayes are sliown; on the 

 right side, the duct, x 660. 



Fig. 27, Transverse section of a specimen 1 mm, long, to 

 show especially the extent and relations of the gland of De- 

 sliayes. x 250, 



Figs, 28-35. A series of transverse sections of a spe- 

 cimen 10 cm. long, along the lines indicated in fig, 9. The 

 drawings were made with the aid of a camera and afterwards 

 touched up, though not essentially changed. The details of 

 structure are semi-diagrammatic. The rir;ht side in the sec- 

 tions is on the left side of the observer. All x 30, 



Fig, 28. Section through the posterior -" --tor muscle 

 and cephalic hood. Tubular part of style sheath to the right 

 side. Posterior aorta asyinmetrical , on the right side. 



