Vol. 50.] 



GOSAU BEDS OF THE GOSAU DISTRICT. 



145 



Cretaceous age by Lydekker. Thus we cannot hope to get much 

 result from studying the reptiles of Neue Welt as to the geological 

 horizon of the beds in which they occur. 



Neither do we get any further help from the cephalopoda, as 

 none of them are characteristic of any particular English horizon, 

 the form best known in England, viz. Scaphites cequalis (Sow.), 

 ranging from the Gault to the Chalk "Rock. 



Probably none of the Gosau species of gasteropoda occur in any 

 English Cretaceous beds whatsoever. It is doubtful whether 

 Aporrhais calcarata (Sow.) of the Gault and Upper Greensand of 

 Blackdown occurs at Gosau, the form from Gosau, originally named 

 Rostellaria calcarata (Sow.), having been assigned by Stoliczka to 

 Alaria (probably Aporrhais) granulata (Sow.). In fact only a very 

 few gasteropoda at all are common to the Gosau Beds and the North 

 of Europe, e. g. Turritella Eichwaldiana (Goldf.), occurring in the 

 Upper Chalk of Haldem; Nerinaia Buchi, iV. flexuosa, and Volvu- 

 lina Icevis, in Bohemia ; Natica h/rata, in North Germany ; and 

 Fwus Nereidis (Miinst.), in the Chalk of Haldem. 



Coming now to the lamellibranchiata, we find the following 

 Gosau species in English Cretaceous beds, with the subjoined dis- 

 tribution : — 



Nkocomian Modiola (squalls (Sow.) Atherfield. 



1 Cardita tenuicostata (Sow.). 



J Gervittia solenoides (Defr.). 

 Gau lt ■{ Ostrea vesicular is (Lam . ) . 



J Janira (Neithea) quadricostata (Sow.). 



( Inoceramus Cripsi (Mant.). 



fProtocardia hillana (Sow.) . 

 Gervittia solenoides (Defr.) . 



I Janira (Neithea) quadricos- 

 Uppeb Greensand ■{ lata (Sow.). 



j Cypricardia testacea (Zitt.) . 



1 



Isle of 



( 



Lower Chalk 



Cardita temdcostata (Sow.) 

 Gervittia solenoides (Defr.) . | 

 Ostrea vesicularis (Lam.) ... ■{ 

 Janira (Neithea) quadricos- I 

 tata (Sow.) j 



Blackdown. 



Warminster. 



Blackdown and 

 Wight. 



Comes very near Cyprina 

 cuneata (Sow.) from the 

 Blackdown beds. 

 /'Gault forms occurring as 

 derived fossils in the Cam - 

 bridge Greensand (see 

 Geol. Surv. Mem. on 

 Geology of Neighbour- 

 hood of Cambridge, p. 

 152). 



Middle Chalk 



Upper Chalk 



Ostrea vesicularis (Lam.). 

 Spondylus striatus (Sow.). 



Badiolites Mortoni Also in Cambridge Green- 

 sand. 

 Inoceramus latus (Mant.). 



f Ostrea vesicularis (Lam.). 



'" \ Inoceramus latus (Mant. ). 



( Ostrea vesicularis (Lam.). 



Pecten virgatus (Nilss.). 



■ cretosus (Defr.). 



Icevis (Nilss ). 



Janira (Neithea) substriatocostata (Sow.). 



Inoceramus Cripsi (Mant.). 



Lamarcki (Park.). 



^ latus (Mant.). 



