244 WILMORE : CARBONIFEROUS LIMESTONE ZONES. 
The chief fossils in these beds are — 
Zaphrentis densa Carruthers ] . , 
„ - , . c somewhat rare. 
Zaphrentis ambigua J 
Caninia cornucopiae Mich. 
Caninia cyhndrica (Scouler), or gigantea Mich. 
Michehnia cf. grandis or MicheHnia cf. megastoma Phill. 
Syringopora reticulata Goldf. 
Syringopora cf. ramulosa Goldf. 
Productus sublaevis de Kon. 
Productus cf. pustulosus Phill. 
Pr. cf. semireticulatus Mart. 
Orthotetes crenistria (Phill). 
Chonetes cf. papilionacea Phill. 
Chonetes cf. comoides Sow. 
I have found a Clisiophj^llum just at the top of the beds with 
large Caninia at the Crags near Bell Busk. I have obtained a 
specimen of Lithostrotion from the material on the floor of the 
Quarry at Swinden Gill Head, where the tj^pical Caninia gigantea 
or cylindrica occurs. These are the earliest occurrences of the 
upper corals known to me. 
Seminula Zone. 
To this zone may probably be assigned most of the knoll beds, 
of Downham and Clitheroe, the upper beds of the Crags near 
Bell Busk, the " Knoll " beds of Crag Lai the and Fogger, and the 
exposure of white limestone near Newsholme. The zone also 
probably includes the lower beds which occur chiefly on the 
northern side of Elbolton, but which are partly folded in with 
the upper beds in that mighty knoll, also part of the folded beds 
of Swinden. The beds Avith Carcinophyllum and Lithostrotion 
martini near Threapland may also be provisionally assigned to S. 
Cyathophyllum cf . murchisoni appears and becomes plentiful. 
Carcinophyllum and Lithostrotion are also fairly common, but 
Clisiophyllids other than Carcinophyllum are still relatively rare. 
Syringopora cf. " distans," and Syringopora cf. geniculata occur 
rarely, but Cladochonus seems to have replaced Syringopora for 
the most part. Michelinia sp. tending towards tenuisepta occurs. 
Dibunophyllum Zone. 
This zone probably includes most of the rich collecting 
