By Di Bartolo C., Gambini R., Porto R.A.

We learn the canonical therapy of classical limited mechanical systemsformulated with a discrete time. We turn out that lower than very basic stipulations, it ispossible to introduce nonsingular canonical differences that safeguard the constraintsurface and the Poisson or Dirac bracket constitution. The stipulations for thepreservation of the restrictions are extra stringent than within the non-stop case and asa outcome the various continuum constraints develop into moment type upon discretizationand must be solved via solving their linked Lagrange multipliers.The gauge invariance of the discrete thought is encoded in a collection of arbitrary functionsthat look within the producing functionality of the evolution equations. The resultingscheme is common sufficient to house the therapy of box theories on thelattice. This paper makes an attempt to explain and wear sounder footing a discretizationtechnique that has already been used to regard numerous platforms, together with Yang-Mills theories, BF thought, and common relativity at the lattice

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Masoni. Spath (1923, pp. 58) commented on the distinctiveness of the New Zealand material now described as H p. masoni and remarked particularly on the characteristics of the ventral ribbing and ventral sinus (see items (i) and (ii) on p. 3 1). Holcophylloceraspassari masoni juv. Auckland. P. Mason. cf. Holcophylloceras, sp. indet. LOCALITIES: New Zealand Geological Survey collections: CE1678: GS5941, east coast of Totara Point, KawhiaHarbour. A. Fleming, D. R. Stevens, 1956. University of Auckland collections: C389, Klondyke Road, Onewhero, Port Waikato.

Grant-Mackie et al. 1968. C1537, 1538: AU9893, Moewaka(=Ponganui) Quany. W. Auckland. P. Mason 1951. 1779). Collected by P. A. Maxwell. REMARKS:Four small ammonites, up to 18 mm in diameter, have been collected from the base of the Ethelton Conglomerate outcropping in the Hurunui River, North Canterbury (McKellar et al. 1962, p. 491), and in a neighbouring area (UCM14 above). All represent the same taxon and have been tentatively assigned to P salima. Associ- ated fossils, including hivalves, belemnites and the holotype ofldoceras speighti (Marshall) range in age from Heterian toPuaroan (Stevens 1965, pp.

Suture saddles diphyllic and triphyllic. RANGEOF GENUS:Bajocian-Tithonian (Arkell et al. 1957, p. 189). Ptychophylloceras sp. indet. Plate 9, fig. ; Fleming & Kear, p. 32. 1960 PfychophyNoceras;Fleming, p. 267. 1968a PlychophyNoceras;Stevens, p. 22. 1974 Pfychopkyl~oceros; Stevens, p. 746. 33 LOCALITY:NZ Geological Survey collections: CE281: Kowhai Point KawhiaHarbour. S. Browne. HORIZON:Lower Ohauan [Late AGEAND STRATIGRAPHIC Kimmeridgian]. In the Kawhia Harbour succession the species occurs in the middle ofthe Kowhai Point Siltstone (Fleming & Kear 1960, p.

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