The Cambridge natural history, Vol. 03 (of 10)Note 408 — Chapter XV · CLASS GASTEROPODA (continued): OPISTHOBRANCHIATA AND PULMONATAReading editionProc. Ac. Philad. 1892, p. 390.◇Copy noteReturn to CHAPTER XV CLASS GASTEROPODA (continued): OPISTHOBRANCHIATA AND PULMONATA