"Vol. 52.] IN YORKSHIKE AND LINCOLNSHIRE. 185 



certain presence of the upper portion of the Speeton Series in the pits, 

 there is no proof of the existence of the lower zones. 

 The fossils in question are as follows : — 



In the Natural History Museum, South Kensington (in the Bean 

 Collection). 



Ammonites (Hoplites) Deshayesii, Leym. One of the specimens bears a label 

 with the MS. name A. knaptonensis, Bean. 1 



Ammonites planus, PhilL, probably the young form of A. (Amaltheus) bicur- 

 vatus, Mich. I have recently found the same form at Speeton similarly asso- 

 ciated with Hoplites Deshayesii. 



? Ammonites (Hoplites) regalis, Pavl. It is doubtful whether this is really a 

 Knapton species. Two small unlabelled specimens are contained in a tray with 

 other fossils marked ' Knapton,' but in appearance they closely resemble Speeton 

 specimens and differ from the Knapton fossils. 



In the Woodwardian Museum at Cambridge. 



Terebratulina Martiniana, 2 d'Orb. ; labelled Terebratulina striata. 



In the Museum of the Scarborough Philosophical Society. 

 Pholadomya {Martini, Forbes) ? ; in a rather crushed condition. 



To these we may also add the following species recorded by Prof. J. Phillips 

 in his • Geology of the Yorkshire Coast ' (3rd ed. p. 242) : — 



Hamites maximus (mentioned in 1st edition only). 

 Waldheimia faba, d'Orb. 

 Ehynchonella lineolata, Phill. 



Some further evidence on the subject is afforded by the descrip- 

 tion of one of the Knapton pits given in 1822 by Young and Bird 

 in their ' Geological Survey of the Yorkshire Coast,' which reads as 

 follows (2nd ed. p. 62):— 



4 In one of the clay-pits at Knapton we see the junction of the 

 shale with the red and grey chalk. The clay, where it joins the 

 chalk, is soft and plastic ; and this, also, is the case with the lower 

 part of the chalk. The two substances are partly blended together ; 

 the soft chalk, which occurs here of both colours, approaching to 

 the state of red or grey clay ; while the clay that is next the chalk 

 is somewhat impregnated with calcareous matter, and is almost 

 divested of its schistose quality. The same facts are observed in 

 the specimens from the Staxton boring, and at the junction of the 

 chalk and shale in the lower part of the Speeton cliffs.' 



This description implies a gradual passage of the Red Chalk into 

 the underlying clay, and is quite opposed to Prof. Judd's view that 

 there is an unconformahle overlap of the base of the Chalk at this 



1 From a reference to this species in Young and Bird's ' Geological Survey of 

 the Yorkshire Coast,' I should, however, judge that the name was originally 

 applied by Bean to the ammonite next on the list, namely, A. planus, Phill., 

 since the fossil is classed with the Nautili, and described as follows : — 'A minute 

 flat shell, remarkably smooth, with a small umbilicus and a slight keel, occurs 

 in the upper shale. It resembles some of the ammonite family, and Mr. Bean 

 has named it A. knaptonensis' (2nd ed. 1828, p. 272). 



2 I am indebted to Mr. J. F. Walker, M.A., for this determination. 



