156 THE LIAS AMMONITES. 



Anthozoa. 



Thecosmilia gregaria, Edw. Sf Haime. 

 Isastrsea tenuistriata, Edw. ^ Haime. 

 ThamnastrEea Defranciana, Michelin. 



Latomseandra Davidsonii, Edw. Sf Haime, 

 Montlivaltia Wrightii, Edw. Sf Haime. 

 — Delabechei, Edw. & Haime. 



No. 2. Chemnitzia-grit is a thin band of brownish marl and clay, in which are 

 sometimes found specimens of Chemnitzia procera, Deslong., and moulds of Nerincea. 

 Pishes' teeth are occasionally collected in this band. 



No. 3. Euhhly Oolite. — Consisting of oolitic ragstones, in a fragmentary state, with 

 few fossils. This bed caps the next division. 



B. The Zone of StepJianoceras Humphiesianum. 



No. 4. The Brackiopoda-hed is a compact crystalline buff-coloured limestone ; 

 many blocks of great hardness are almost entirely composed of the shells of Terebratula 

 Phillipsii. It measures two feet six inches, and contains the following species of 

 fossils : 



Lima proboscidea, Sow. 

 Terebratula Phillipsii, Mor. 



— perovalis, Sow. 



— carinata, Lamh. 



Terebratula Buckmani, Davids. 

 Rhynchonella spinosa, Schloth. 



— subtetrahedra, Bavia 



— aiigulata, Sow. 



On one occasion, by digging into the floor of the quarry, I found a bed of marly 

 oolite, or mudstone ; it contained many fossils, the shells of which were in such a 

 perished condition that I could not determine all the species. I noted, however, the 

 following : — 



Chemnitzia. 



Nerinaea. 



Modiola plicata, Sow. 



Pecten comatus, MUnst. 



Cypricardia cordiformis, Desh. 

 Terebratula Etheridgii, Eavids. 

 Montlivaltia, species. 



No. 6. The Boad-stone consists of a coarse, brown, ferruginous, oolitic limestone, 

 hard and crystalline in some parts, and in others traversed by sandy layers, containing 

 concretionary masses of calcareo-siliceous rock, having an unequal fracture and crystalline 

 structure. It contains a small assemblage of Mollusca, many of which are specifically 

 distinct from those of the upper beds, as Chemnitzia Smmanni, Oppel, nearly identical 

 with the Coralline-oolite species, C striata, Sow., gigantic forms of Pholadomya Heraulti, 

 Ag., and very large shells of Trichites undidatiis, Lye. This bed varies in thickness 

 from ten to fifteen feet. 



