318 



Rev. A. Irving — On the Permian and Trias. 



DYAS. 



FAUNA. 



(Very rare) Protozoa 



Calamopora , ) „ 



AlveouL } CCELENTERATA. 



(Very rare) Annuloida ... 



Fenestella retiformis* Polyzoa . . 



Crustacea 



Spirifera undulata* , 



Prodiictiis korridus* 



Strophalosia Morrisiana* ., 

 Caviarophoria Schlotheimi^ 



Terebratula elongata?^ 



Lingula Credne7-i* 



}- Brachiopoda.. < 



Schhodus obscurits ") 



Avictda spelimcaria | 



Area striata ! Lamelli- 



Mytilus Hausmanni f 



Gervillia ceratophaga j 



Pecten piisilhis J 



BRANCHIATA 



Turbo , ") 



Pletirotomaria | 



Chiton )> Gasteropoda.. 



Natica | 



Deiitaliiim J 



TRIAS. 



.Rhizocoralliitm yanense (B). 



Encrinus liliiformis^ (M). 

 E. gracilis (M). 

 Aspidiira scutellata (M). 



{ Peinphix Siieiiri (M). 

 ( Esther ia minuta (K). 

 f Terebratula vulgaris* (M K), 



T angiistata (M). 



T. cycloides (M). 



Retzia trigonella \ (Common to M 



Spiriferina fragilis > and Alpine 



Spirifera Mentzeli ) Trias.) 



Spi7-iferina hirsuta (M). 



Rhynchonella Mentzeli (M). 



R. decurtata (M). 

 \^Lingtila tenuissima (K). 

 ( Ostrea placunoides (M). 



Pecten IcEZ'igatus* (M). 



P. discites* (M). 



Lima striata* and Z. lineata (M). 



Gervillia socio lis* (M K). 



Myophoria vulgaris* (M). 



M. costaia* (B). 



M. lineata, M. pesanseris (M). 



M. oj-bicularis, M. elegans (M). 



Trigonodus Sandbergeri (M). 



Myacites elongatus (M). 

 L Unio and Anodonta (K). 



/ De7ttalium loeve (M). 

 I D. toj-quattim (M). 

 j iVatica gregaria (M). 

 \ Turbonilla seal at a (M). 



{Nautilus bidorsatus (M). 

 Ceratites nodosus* (M) 



Xenacanthzis Deeheni 

 Acanthodes gracilis 



J 



Nautilus \ 



Orthoceras \ CEPHALOPODA. \ C. semipartitus, C' Buchi {M) 



Cyrtoceras ) | Rhyncholites hirundo (M) . 



L ConchorhyncMts avirostris (M). 

 PalcEoniscus Freieslebeni ...'\ { Saiirichthys {\s\Y^). 



P. Vratislaviensis | j Gy7-olepis {^¥J). 



Platysomus gibbosus I PiscE^ ) Semionot2is Bergei-i {¥^. 



Amblypte7-us macropterus ... [ '' ; Ceratodus (K). 



I Acrodus (M K). 

 X^Hybodus plicatilis (M K). 

 [ Cheiivtherium (B). ^ 



I Trematosaw'us (B). 

 \ Mastodonsaurus Jdgeri (K). 

 I Placodus gigas (M). 

 X^Nothosaurus niirabilis (M K). 



Mammalia ... Microlestes {Y^). 



* Highly characteristic of the Dyas and Trias respectively. 

 A reyiew of the above table shows, (1) That of the jiora of the 

 two periods there is not a single genus of any importance which is 

 known to range through both systems ; (2) That of the fauna only 

 three genera of Brachiopods, two genera of Lamellibranchiates, two 

 genera of Gasteropods, and one genus of Cephalopods common to 



Proterosaurus Speneri ) Reptilia 



