36 



PROCEEDINGS OF THE GEOLOGICAL SOCIETY. 



[Apr. 6, 



their chambers filled with crystallized carbonate of lime. The light 

 marl (e) contains Ammonites Sowerbyi, Astarte modiolaris, Pecten 

 demissus, Trigonia costata, and many other bivalved shells. The 

 shell-bed (/) contains Pleurotomaria, Ceromya Bajociana, Terebra- 

 tula perovalis. In the " Dew-bed" (g) bones and portions of fossil 

 wood are found, although 1 failed to observe any shells. 



5. Section in the Quarry at Bradford Abbas, Dorset. 



ft. in. 



A. Parkinsoni-zone. 



a. Light-coloured oolitic ragstone 3 6 



b. Light cream-coloured marl 5 



B. Humphriesianus-zone. 



c. Ammonite-bed; brown ferruginous oolite, much 

 iron-shot, with crystallized carbonate of lime ; 

 Ammonites Sowerbyi and A. concavus 1 



d. The Shell-bed ; a brown, iron-shot oolite, con- 

 taining many Gasteropoda and Conchifera 2 4 



e. The " Dew-Bed" ; greyish, hard, crystalline rock, 

 partly shelly, with Polyzoa in nests on the sur- 

 face 1 6 



The ragstone and cream-coloured marl of A are employed for 

 road- material, and contain impressions of Ammonites ParTcinsoni 

 and many fragments of Belemnites canaliculatus and B. giganteus. 

 b contains many specimens of Astarte modiolaris and Lima semicir- 

 cularis. In the zone of Ammonites Humphriesianus (B), c is very 

 rich in Ammonites Sowerbyi and A. concavus ; and here I found the 

 new Ammonites Oppeli, Wr. d has yielded most of the Gasteropoda 

 and Conchifera contained in the annexed list. The " Dew-bed" (e) 

 contains Ceromya Bajociana, Cypricardia cordiformis, and a species 

 of Spiropora ; portions of bone and wood have likewise occasionally 

 been found in it. 



Fossils from the Humphriesianus Zone of Somerset, contained in my 



Cabinet. 



Belemnites giganteus, Schlofh. 



canaliculatus, Schlofh. 



Nautilus lineatus, Sow. 



sinuatus, Sow. 



Ammonites Sowerbyi, Mill. 



leeviusculus, Sow. 



Brocchi, Sow. 



— — Humphriesianus, Sow. 



Braikenridgii, Sow. 



Blagdeni, Sow. 



— Dorsetensis, Sow. 



discus, Quenst. (non Sow.). 



concavus, Sow. 



Oppeli, Wr., sp. n. 



Chemiritzia lineata, Sow. 

 bicarinata, Wr., sp. n. 



Chemnitzia multistriata, Wr., sp. n. 



tm-ritelliformis, Wr., sp. n. 



Straparollus spinosus, Wr., sp. n. 

 Turbo elaboratus, Bean. 



Milleri, Wr. 



Natica, sp. n. 



Neritopsis Bajocensis, d' Orb. 



Trochus duplicatus, Sow. 



heliacus, d' Orb. 



Monodonta laevigata, Sow. 



obliquimuricata, Wr., sp. n. 



Cirrus nodosus, Sow. 

 Trochotoma calyx, Phil. 

 Pleurotomaria armata, Milnst. 



Bessina, d' Orb. 



ornata, Sow. 



