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By Kennedy W.J., Cobban W.A.

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We figure here some of the more perfect examples known to us (Pis. 10-11), and would also point to the following examples, readily available in the Treatise (Arkell et al. 1957), among a host of others: 1. Ptychites (Anisian to Ladinian ceratitid) and Neoptychites (Turonian acantho­ ceratid). 2. Balatonites (Anisian ceratitid), Tropiceltites (Carnian tropitid), Arietites (Sinemurian psiloceratid), and Mortoniceras (Albian acanthoceratid). 3. Discotropites (Carnian tropitid), Grammoceras (Toarcian hildoceratid), and Neoharpoceras (Albian acanthoceratid).

Post-mortem distribution, which may be: (a) Minimal, in which case the occurrence closely reflects the original life distribution. (b) Extensive, the resulting post-mortem drift producing a distribution pattern far wider than in life, as in Recent Nautilus. (c) Tectonic separation or juxtaposition of regions as a result of plate motions. Much information on ammonite distributions has been published in three recent compilations: Faunal Provinces in Space and Time (Middlemiss and Rawson 1971), the Atlas of Palaeobiogeography (Hallam 19736, specifically Cariou 1973; Enay 1973; Dietl 1973; Howarth 1973a; Kummel 1973; Matsumoto 1973; and Wiedmann 50 AMMONITE ECOLOGY 1973a-6), and The Boreal Lower Cretaceous (Casey and Rawson 1973).

La-b, 10 the c o s t a t e var. regularis H a a s a n d la-b, the typical form. F r o m the m i d - T u r o n i a n Carlile S h a l e o f the B l a c k Hills at U S G S M e s o z o i c locality 2 1 7 9 2 . F i g s . 3 , Oxytropidoceras (Manuaniceras) hubbardi K n e t c h e l , U S N M 2 6 1 0 6 5 , f r o m the m i d - A l b i a n o f P e r u a n d 4, Discotropites sandlingensis H a u e r , U S N M 7 4 0 0 9 , f r o m the late Triassic H o s s e l k u s L i m e ­ s t o n e , S h a s t a C o u n t y , California.

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