248 G. Sharman and E. T. Neuion— 



The specimens sent, which number between two and three 

 hundred, are all in the condition of internal and external moulds, 

 in a light-coloured, fine-grained sandstone ; and although slight 

 differences may be noticed in different pieces of the rock, they 

 are all so similar that one can scarcely question their having been 

 originally derived from the same bed. Notwithstanding this the 

 fossils clearly indicate more than one horizon. 



Most of Salter's type specimens are preserved in the Museum of 

 Practical Geology, having been presented by Mr. Ferguson ; and the 

 matrix of those referred to the Upper Greensand is like that of the 

 specimens which form the subject of this note. 



Several forms, in addition to those mentioned by Salter, have been 

 identified ; and as some indicate lower horizons than the Upper 

 Greensand, some remarks upon certain of the species are called for. 

 These specimens being, as above stated, in the condition of moulds, 

 it has been necessary to take impressions of the cavities ; and these 

 give the external forms of the shells, some of which are thus 

 reproduced in a beautifully perfect manner; this was especially 

 the case with the Troclius pulcherrimus and Ecliinocyplius. At first 

 we were prepared to find these fossils to be of Upper Greensand 

 age, as stated by Salter; and when we became aware that several 

 of the forms were of a Lower Greensand or Speeton Clay type, we 

 consulted with our friend and colleague, Mr. Lamplugh, who for 

 years has been familiar with the Speeton fossils, and he at once 

 recognized in the. Ammonites and some other forms a distinctly 

 Speeton facies. We are much indebted to him, not only for valuable 

 suggestions, but also for the opportunity of comparing our specimens 

 with his large series of Speeton fossils. 



Cephalopoda. 



AmmonitidcB. — Three Ammonites were recognized by Salter, but 

 only one specific name was given in the list, namely, Ammonites 

 Selliguinus, Brong. ? and this with doubt. We have seen nothing 

 that could be referred to Brongniart's species. 



Ammonites (Olcostephanus) Speetonensis, compressed variety. — The 

 two forms figured by Salter, but not named, we have recognized. 

 One of these (Salter, pi. ii, fig. 10) was said to be allied to 

 Ammonites Jeannotii (D'Orb., Terr. Cret., pi. lvi) ; but we recognize 

 a closer relationship to Ammonites Speetonensis, and it seems to us 

 to come nearest to the form called by Pavlovv Olcostephanus 

 (Simbersltites) Payeri (Bull. Imp. Soc. Moscow, 1891, pi. xviii, 

 fig. 1) ; but although flatter forms than that figured by Pavlow 

 occur at Speeton, none are so much compressed as some we have 

 from Moreseat ; this, however, may be due to pressure in the rock. 

 The obliquity of the ribs varies in different specimens. We regard 

 this Ammonite as a flattened variety of A. Speetonensis. The 

 Olcostephauus PhiUipsii (Neumayer, Palasont., vol. xxvii, pi. xv, 

 fig. 7) from the Hilsbildungen, is another closely allied form. 



The second specimen figured by Salter (pi. ii, fig. 9) is related to 

 the flattened variety of Speetonensis, and this we have also recognized, 



