New Zealand Cenozoic molluscs described by Zittel in 'Palaontologie von Nue-Seeland' (1865) are revised, the plates republished, and most of the specimens reillustrated, along with comparative specimens. Hochstetter's fossil localities are clarified, based on diary entries and published descriptions, and Zittel's introduction and figure captions are translated. The locality 'several miles north of Raglan Harbour' is Te Hara Point, 6.5 km north of Raglan. Most molluscs have been interpreted correctly. However, Ostrea nelsoniana Zittel is a synonym of the late Miocene to living 'Bluff oyster' O. chilensis Philippi in Kuster, 1844, rather than an Oligocene Crassostrea species. Lentipecten hochstetteri (Zittel) is a short, wide Oligocene species (width 104-110% of height) rather than the taller, unnamed Miocene homeomorph (width 94-97% of height) to which this name is usually applied. Austrofusus conoideus (Zittel) is an Awatere Valley species (Starborogh Formation, Waipipian, Pliocene) integrading with Austrofusus allani King, 1934, Austrofusus zitteli (Suster, 1914), supposedly from Magazine Point Formation (Whaingaroan, Oligocene) at Nelson is unrecognisable, but probably also was based on a specimen of A. conoideus from Starborough Formation. Struthiolaria dolorosa King, 1934 is a synonym of S. cingulata Zittel. Cucullaea singularis Zittel, 1865 and Reredo heaphyi Zittel, 1865 are unrecognisable. A neotype is designated for Limopsis zitteli Ihering, 1907 (= L. catenata Suter, 1917), and lectotypes are designated for Mesopeplum burnetti, Talochlamys(?) fischeri, T. williamsoni, Dosinia greyi, Antisolarium stoliczkai, Crepidula incurva, Struthiolaria cingulata, S. canaliculata, and Dentalium mantelli, all of Zittel, 1865, Crypta striata Hutton, 1873 and Alcithoe hurupiensis Marwick, 1926. The publication date of all contributions in 'Palaontologie von Neu-Seeland' is 27 April 1865.