502 MR. W. A. E. TJSSHER ON THE DEVONIAN 



between Carej' Arms, Babbacombe, and Ilsbam, for the most part, 

 the Kingskerswell and Kerswell-Down limestone mass, the lime- 

 stones of Woolborough, Langs Copse, Bradley Manor, East Og well, 

 Conniter, and Dornalield, north of Ipplepen, belong to a higher 

 horizon, in which we may also include the Clennon-hill limestones 

 and most of the limestones south of Groodrington. Parts of the East- 

 Ogwell, Woolborough, Kingskerwell, Barton, and Ilsham limestones 

 may be included in the Upper Devonian. The commonest corals 

 are Alveolites, Favosites polyinorplia, and /':>tromaf02Wfa, whilst in 

 the lower beds Cystiphyllum vesiculosam, Cyatliophyllum lielian- 

 tJioides, and C. damnoniense are locally common, as also jhfeliolifes 

 porosas, and Favosites Goldfussi. 



The Marldon limestones contain in the lower beds Amplexus 

 tortuo.ms, CyatJiophyllum heliantJioides, and Cystiphyllum vesi- 

 culosum. 



The age of the West-Ogwell limestone is sufficiently proved by 

 the occurrence in it, near Chircombe Bridge, of Stringocephalus. 

 Receptaculites Neptuni was found in the same locality by Professor 

 Gosselet ; yet three species of Phillipsia, identified by Salter, viz. 

 P. anticipator, P. Brongniarti, and P. Pengellyi, are recorded bj' 

 Mr. Pengelly (in '' Notes on Recent Notices," «S:c., pt. i. Trans. Dev. 

 Assoc, for 1874) as having been obtained at Chircombe Bridge *. Cri- 

 noidal limestones occur at Denbury and Torbryan ; but crinoidal 

 limestones are not restricted to particular horizons. 



Strlngoceplialas has been obtained at Clennons-Linhay, near 

 Ipplepen, and in the Kingsteignton limestone mass, which also con- 

 tains Heliolites porosus. I can trace no persistent Gasteropod- 

 horizon in the Middle-Devonian limestone ; numerous small Gas- 

 teropods occur locally in it, as near Stantor, north-east of Marldon. 



The limestones betray a tendency to pass into slate near Little 

 Hempston ; and, as the Marldon, Berry-Park, and Dartington lime- 

 stones form only the lower part of the larger masses of Ipplepen, 

 Kingsteignton, Kingskerswell, and Torquay, it seems as if the centre 

 of the Dartington trough was occupied by slates representing the 

 middle or upper parts of the Middle-Devonian limestone. As the 

 Ashburton limestones also die out southward, there is an apparent 

 replacement of limestone by slate to the south of Torbryan, the 

 upper part of the limestones being the least persistent. 



At Dartington, north of Little Hempston, and at Dainton, blue- 

 black slates, similar to those at the base of the Babbacombe clifi', 

 occur : but the suggestion that these are a type of slates replacing 

 the medial portions of the Middle-Devonian limestone is not at 

 present susceptible of proof. Those in the Babbacombe cliff were 

 compared by Dr. Kayser to " the upper part of the AVissenbach and 

 (xoslar slates of the Upper Harz, which belong to the Striugo- 

 ceph(dus-h.oYizo\\J^ Mr. Champernowne's version of the Dartington 

 structure would entirely confirm Dr. Kayscr's comparison, which is 

 also in general accord with the facts ; but these are of so complex 



* These would now be doubtless referred to the Devonian genus Dcrhani'lla. 



