200 R. B. Newton — Cretaceous Zones in Dorset. 



survived to later times, viz. Pleuromya plicata and Cncnllcea cariuata ; 

 tlie other species are not known in a higher horizon than this zone. 

 Soplites Benettianns appears to be confined to it ; whereas Ostrea 

 Leymeriei and JExogyra sinuata, having been found at Atherfield and 

 in the upper part of the Speeton Cliff, etc., would date their 

 existence from the Rhodanien stage of the Urgonian (or Barremian) 

 epoch. The examples of Ostrea Leymeriei are of great size, one of 

 them measuring 221 - 5 by 180 millimetres, being in excess of the 

 largest known specimen figured by Coquand in his work on the 

 " Ostrea," 1869, pi. lxxi, fig. 6, which measures 180 by 175 mm. 



(B) The Hojolites interruptus Zone. 



The matrix of this zone, as represented at Okeford Fitzpaine, is 

 more sandy than argillaceous, and full of minute specks of mica; 

 in these characters, as well as in its dark-grey colour, it bears 

 a strong resemblance to what obtains in the Lower Gault beds at 

 Black Ven, near Lyme Regis — and Lima parallela appears to be 

 equally abundant at both localities. 



As this is the first record of Gault fossils from this part of Dorset- 

 shire, the following list of species recently collected by Miss Forbes 

 and Miss Lowndes will, it is hoped, be of special interest : — 



PISCES. 



Lamma appendiculata, Agassiz, sp. 

 Synechodus, sp. 



CEPHALOPODA. 



Samites, sp. 



Soplites interruptus, Bruguiere, sp. 

 Soplites spkndens, J. Sowerby, sp. 

 Nautilus Clementinus, Orbigny. 



GASTEROPODA. 



ActcBon Bvpiniana, Orbigny (allied to). 

 Anchura carinata, Mantell, sp. 

 Avellana ivjlata, J. de C. Sowerby. 

 Natica Gaultina, Orbigny. 

 Scala Bupiniana, Orbigny. 

 Solarium ornatum, J. de C. Sowerby. 



LAMELLIBRANCHIATA. 



Cucullcea carinata, J. Sowerby, sp. 

 jEntolium orbiculare, J. Sowerby, sp. 

 Gervillia solenoides, Defrance. 

 Inoceramus concentricus, Parkinson. 

 Lima parallela, J. Sowerby, sp. 

 Mytilus subsimplex, Orbigny (allied to). 

 Nucula pectinata, J. Sowerby. 

 Ostrea canaliculata, J. Sowerby, sp. 

 Tecten, sp. 



Pleuromya plicata, J. de C. Sowerby. 

 S'den Bupiiiianus, Orbigny. 

 Thracia simplex, Orbigny, sp. 

 Trigonia ai<eformis, Parkinson. 

 Trigonia Archiaciana, Orbigny. 

 Trigonia Filtoni (Desbayes), Leymerie. 





