Speight. — The Tertian/ Beds of the Trelissick Basin. 



347 



It is generally, admitted that the tuft's underneath the limestone in the 

 Whitewater Creek section are in the same stiatigraphica! position as those 

 between the limestones in the Porter. From the former the following were 

 collected : — 



*Ancilla australis (Sow.). M. 

 *AncUla depressa (Sow.). T. & S. 

 *Callistoma aucklandicum Smith. T. 



& S. 

 *Calyptraea maculata (Q. & G.). M. 

 *Cantharidus tenebrosus A. Ad. M. 

 *Capulus australis (Lamk.). M. 



Cardinal ■ facetum Sut. T. & S. 



Cardium patidum Hutt. M. 

 *Cochlodesma angasi (C. & F.) I M. 



Gymatium minimum (Hutt.). M. 



Cypraea ovulatella Tate. M. 



Gypraea trelissickensis Sut. M. 



Gytherea chariessa Sut. M. 

 *Emarginula wannonensis Harris. M. 



Epitonium cylindrellum Sut. M. 



Fissuridea annulata Sut. M. 



Lapparia corrugata (Hutt.). M. 

 *Lima ballata (Born). M., T. & S. 



Lima colorata Hutt. M. 

 *Limopsis aurita (Brocchi). M. 

 *Mactra elongata Q. & G. M. 



Marginella dubia Hutt. M. 



Pecten palmipes Tate. M. 



Polinices huttoni Iher. M., T. & S. 



Protocardia sera Hutt. M. 



Siphonalia orbita Htitt. T. & S. 

 *Siphonium planatum Sut. M. 



Teredo heaphyi Zitt. M., T. & S. 



Trivia zealandica T. W. Kirk. M. 



Trochus nodosus Hutt. M. 



Turritella bicincta Hutt. M., T. & S. 



In addition to the species enumerated, Hutton records the occurrence 

 of the following in the tuffs and greensands, presumably from the upper 

 tuffs, since he does not mention the lower tuffs (loc. cit., p. 405) :■ — 



Ancilla hebera (Hutt.). 

 *Arca decussata (Sow.). 



Brissus eximius Zitt. 

 *Calliostoma spectabile (A. Ad.). 



Grassat elides attenuatus (Hutt.). 



Echinus woodsii Laube. 



Flabellum laticostatum T. -Woods. 



Flabellittit, sphenodeum T. -Woods. 



Fvlgoraria attenuata (Hutt.). 



Leicidaris australis Duncan. 



Lima jeffreysiana Tate. 

 Mitra enysi (Hutt.). 

 Mytilus striatus Hutt. 

 *Natica australis (Hutt.). 

 Paphia attenuata Hutt. 

 Pecten polymorphoides Zitt. 

 Pericosmus compressus McCoy 

 Turritella ambulacrum- Sow. 

 Yenericardin pseutes Sut. 



Hutton remarks that Flabellum laticostatum is not found elsewhere, but 

 it certainly occurs in the lower tuff bed at Broken River. He also places 

 the percentage of Recent Mollusca at about 10 per cent. This, however, 

 is much too low in point of fact, and the discrepancy emphasizes the danger 

 of trusting to such percentages for the purposes of determining the age 

 when the number of forms collected is comparatively small. 



He also records the occurrence of Pecten hochstetferi Zitt. and Wald- 

 heimia triangularis Hutt. in the overlying limestone. 



From the upper tuff beds McKay records obtaining Echinus enysi Hutt., 

 Gidaris (plates and spines), Meoma tuberculata Hutt.. Turbinolia, and 

 numerous branching and leaf corals which I do not think have been 

 definitely identified. 



The following is a list of the fossils collected from the shell bed above 

 the upper limestone at the spot where the great fall of rock into the Porter 

 River has taken place. The greater number occur in a layer which it is 



