Formation of the layers and larval characters, pp. 225-273.
_Gasteropoda and Pteropoda_, pp. 225-242. _Cephalopoda_, pp.
242-254. _Polyplacophora_, pp. 254-257. _Scaphopoda_, pp. 257, 258.
_Lamellibranchiata_, pp. 258-269. _General review of Molluscan
Larvæ_, pp. 270-273. Development of organs, pp. 273-288.