384 Transactions. 



PIRIPAUAN. 



The complete fauna recorded from the Ostrea beds is as follows : 

 Nemodon (?) sp., "Area" hectori Woods, Cucullaea sp., Trigonia hanetiana 

 d'Orb, Ostrea sp. cf. dichotoma Bayle, Pecteyi (Camptonectes) hectori Woods, 

 Cardium sp., Pugnellus waiparensis Trechmann, and a rhynchonellid. Of 

 these, Trigonia hanetiana and Pecten hectori are found also in the calcareous 

 conglomerate and black grit respectively of Amuri Blufi and in the Ostrea 

 bed of the Malvern Hills, and Ostrea sp. cf. dichotoma occurs also in the 

 Ostrea bed of the Malvern Hills. Woods considers that the Trigonia and 

 Pecten indicate that the Ostrea bed belongs to the horizon of the Amuri series 

 of Amuri Bluff, and is equivalent to the Ostrea bed of the Malvern Hills. 



The Ostrea bed of the Trelissick Basin contains Ostrea sp. and Inoceramus 

 sp., which have not yet been obtained in specifically determinable specimens, 

 and also a small rhynchonellid, as yet undescribed, which is specifically 

 identical with one found in the Ostrea bed of the Malvern Hills. It may, 

 therefore, be also correlated with the Ostrea bed of the Waipara. 



Ostrea beds of similar stratigraphical position and presumably of the 

 same age are known from the upper Motunau Kiver (McKay, 1881), from 

 the Mount Cass Range,* and from the Harper River (Speight, 1917b). 

 There must be other correlative beds in the area between Motunau and 

 Amuri Bluft', but they have not been described in such a way that they 

 can be identified and correlated. 



Woods (1917) states that the fossils of the Amuri group of Amuri Bluff 

 include only a few forms identical with species found in other parts of the 

 world, but- these and the affinities of the other species show that the fauna 

 is of the Indo-Pacific type, and is of Upper Senonian age. Of the Waipara 

 species, Trigonia hanetiana is one of the characteristic species of the Quiri- 

 quina beds of Chile, while the Ostrea is similar to a species found in the 

 Senonian of other regions. 



The complete saurian fauna from the " saurian beds " and Waipara 

 greensands of the Waipara is as follows : Platecarpus oweni (Hector), 

 Cimoliosanrus australis (Owen), C. hoodi (Owen), C. holmesi (Hector), C. haasti 

 (Hector), C. caudalis Hutt., and Leiodon haumuriensis Hector. The " saurian 

 beds " of Amuri Bluff contain an almost identical assernblage, concerning 

 which Dr. C. W. Andrews has stated, according to Woods (1917), that it 

 indicates an horizon near the top of the Cretaceous, and that it is very 

 similar to the reptilian fauna of the Niobrara chalk of the United States, 

 which is of Senonian age. 



The fish-remaims from the " saurian beds " comprise Scapanorhyuhcus 

 suhulatus (Ag.), a species ranging from Albian to Danian ; Odontaspis 

 incurva (Davis), found also in the Tertiary of New Zealand and Australia ; 

 and vertebrae of Lamna (?). 



The Mollusca of the "saurian beds" include Malletia (Neilo) cymhida, 

 which resembles M. pencana (Philippi) from the Quiriquina beds ; Trigonia 

 waiparensis Woods, comparable in ornament with T. parva Briiggen from the 

 Senonian of north Peru, and with T. crenifera Stoliczka from the Ariyaliir 

 group, of southern India ; and Thracia sp. None of these species has been 

 found at Amuri Bluff or the Malvern Hills. The gasteropods from the 

 Waipara have not yet been described. 



The " saurian beds " and Waipara greensands are without doubt correla- 

 tive with the similar beds of Amuri Bluff. Saurians are also known from the 



* IJ. Speight, personal communication. 



