230 Dr. PiTTON on the Strata below the Chalk. 



Ostrea. A new species? Durlstone Bay. West side of Lulworth Cove, in bluish 

 sandy stone. Durdle Cove, in a bed like the " Cinder". 



Paludina carinifera. W. of Lulworth Cove, with Unio compressus, and a pearly 

 oyster, in the uppermost of the Purbeck beds, some of which are almost entirely 

 composed of shells of Paludinae. Also, with bones of fishes, in very blue com- 

 pact and sparry limestone. 



P elongata. Peverell Point. Abundant in the uppermost beds of the Pur- 

 beck stone, with much green matter. Durlstone Bay, with Cyclas media. 



P Sussexiensis. PI. XX. f. 6. Peverell Point ; in splintery limestone, with 



disseminated calcareous spar. Durlstone Bay. 



Uiiio compressus. Durlstone Bay ; in oolitic stone, with Cypris. 



U — new species ? At the upper part of the series ; in beds composed of carbonate 

 of lime, apparently derived from the presence of these shells, with a large pro- 

 portion of green matter (silicate of iron). East side of Lulworth Cove. Wor- 

 barrow Bay. [The occurrence of bivalves in this place is mentioned by Mr. 

 Webster, Geol. Trans., 2nd Series, vol. ii. pp. 39, 40.] 



Reptiles. — Turtles. Fragments of the shell and bones of Turtles are not unfre- 

 quent, and even entire skeletons are sometimes found in the Purbeck strata. 

 Saurians. Fragments of bone, and teeth. 



Fishes. Palatal bones : Durlstone Bay. The scaly remains, also, of different spe- 

 cies, are frequent in the slaty strata of the Purbeck stone. 



Plants. Near the junction of the lower slaty beds of the Purbeck with the 

 Portland stone, large trunks and branches of coniferous wood are found in great 

 abundance in the "Black Dirt" above the " Cap ", in the Isle of Portland, and 

 on the coast east of Lulworth Cove ; and in the dirt below the " Cap " ? between 

 Upton and Poxwell. 

 A Cone, represented in Plate XXIL f. 9., and stated to be "from Purbeck", is 

 in the Museum of the Geological Society. It has some slight resemblance to 

 the cone of a Dammara of the Moluccas. 

 Cycadeoidea {Mantellia of Adolphe Brongniart, " Prodrome ", &c.). Remains of 

 at least two species of Cycadeae occur in the Isle of Portland, along with the 

 trunks of coniferous trees, in the " Black Dirt" above the " Cap" ; and those 

 of at least one species, also in the dirt or clay, between that bed and the " SkuU- 

 Cap". 



{Portland Stone.'] 



Ammonites biplex. Isle of Portland. 



A new. Isle of Portland. 



Cerithium? excavutum (Turritelia excavata,^in. Con.). West of the Isle of Port- 

 land. 

 Cytherea parva (Venus, Min.Con.). West of Portland, in the flint of the "Roche". 

 Lithodomus. New. Upper part of the " White Bed", Portland. 

 L — . Another species ? Same situation. 



