Speight. — Geology of the TnJissick Basin. 159 



state of preservation. A fragment of a gasteropod showed part of a suture- 

 line with a well-defined band below it, suggesting the Cretaceous genus 

 Nerinaea, which has recently been obtained in Southland by Marshall. 



A special object of my recent visits to the locality was to collect fossils 

 from the loose sands and concretionary bands above the limestones, beds 

 which have been classed as '' Pareora " by all who have examined the 

 Castle Hill Basin. A fu.ll description of these beds, specially those occurring 

 between the two gorges of the Porter River, was given in my previous paper, 

 and so it is unnecessary to mention their lithological features any further; 

 but the beds are also exposed in the bed of Broken River below the road- 

 crossing, in the Thomas, in Home Creek near its junction with the Porter, 

 and in a tributary coming in on the north side of Whitewater Creek, and 

 elsewhere. Collections were made in four of these localities. It is unfor- 

 tunate, however, that the great majority of the fossils are in a poor state of 

 preservation. Between the two gorges of the Porter there are two distinct 

 horizons yielding shells. In the lower of these the following were obtained : — 



Cardium ? sp. 



Cerithium hectori Harris. 



Conwiinella infiata (Hutt.). 



* Macrocallista multisfrkita (Sow.). 



* Mactra discors Gray. 



* Mesodesma atistrale (Gmel.). 

 Paphia curta (Hutt.). 

 Polinices gibbosus (Hutt.). 

 PoUnices ovatus (Hutt.). 



* Tellina eugonia Sut. 



In the lower horizon at Whitewater Creek, in the same stratigraphical 

 position as the above, the following were obtained : *Calyptraea macnlata 

 infiata (Hutt.), Cerithimn hectori Harris, Crassatellites aftenuatus (Hutt.). 



In both these localities there is a well-defined upper horizon characterized 

 by numerous individuals of Sfnithiolaria, which for that reason may be 

 called the Struthiolaria bed. Between the Porter gorges the following were 

 collected : — 



Cerithium hectori Harris. 



Crepidida striata (Hutt.). 



Fastigiella australis Sut.t 



Glycijmeris globosa (Hutt.). 



Glycymeris laticostata (Q. & G.). 



Paphia curta (Hutt.). 



Plejona (Athleta) huttoni pseudorarispina Sut. 



Polinices gibbosus (Hutt.). 



Struthiolaria tuberculata Hutt. 



In beds in similar stratigraphical position in the tributary of the White- 

 water the following were obtained : — 

 Cerithimn hectori Harris. 

 Crassatellites attemiatus (Hutt.), 

 Crepidula striata (Hutt.). 

 Fastigiella australis Sut.f 



* Mactra discors Gray. 

 Polinices gibbosus (Hutt.). 

 Paphia curta (Hutt.). 

 Struthiolaria tubercidata Hutt. 



* Recent. f New species described in this volume (p. 68). 



