By Gygi R.A.

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Extra resources for Perisphinctacean ammonites of the type Transversarium Zone (Middle Oxfordian, Late Jurassic) in northern Schwitzerland

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Their forward inclination varies be­ tween 5" and 8°. At 72% of the whorl height they split into two to three strong secondary' rihs. The secondaries have the same direction as the primary ribs. They are not attenuated at the siphonal side. The lasl whorl covers the preceding one by 25%. Affinities: The specimen MNHB J 23645 (fig. 1 23645. Material: 7 specimens: MNHB J 23168. J 23645. J 24613. J 24616. J 24622, J 24623. J 24829, Perisphinctes {Diclwhmiosphiticics j all', biicitmani Arkell. 1936 [m| Holotype: Geological Survey Museum, number 47844.

Aff. Type locality: Trept, Departement Isere. France. Type horizon: Couches a Peltoeeras iraiisversuriuni. Description: "Ihe glaucoiiiiical. curbonale internal mould of MNHB J 24581 is septate lo the diameter of 65 mm. A small fraction of Ihe last whorl is occupied by the body chamber. The whorl section is thick-oval and somewhat depressed. The primary ribs begin at the umbilical suture line on the inner whorls, bui from [he begin nine of ihe last V. horl the umbilical wall becomes smooth. On the last whorl the primary ribs begin first on ihe tippet umbilical wall, then al the umbilical margin.

J 24824. J 24826. J 24834. J 24835. Hohlvpe; Museum of Natural History, London. C 3S0O8. plate 32:2 in ArkeJJ. (193S). Type area: Cowley-Horspalh district. i: Corallian. Description: The glnnconitical. carbonate internal mould of MNHB J 31560 is wholly septate. The whorl section is rectan­ gular 10 suUpiadrale with \cry slightly comerging whorl sides. The siphonal side is rounded. The primary ribs begin on the inner whorls al the umbilical suture line and on the last W'horl on the umbilical margin.

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Perisphinctacean ammonites of the type Transversarium Zone (Middle Oxfordian, Late Jurassic) in northern Schwitzerland by Gygi R.A.


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