258 Prof. Sedgwick on the Geological Structure of Scotland. 



Orthoceras^ traces of; Illoenus latus, M'Coy. Locality. — 

 Wrae on the Tweed. Murchisonia angustata, Hall, Chazy 

 limestone species ; EccuUomphalus Scoticus, M'Coy ; Orthis 

 confiniSf Salt, common; Illwnus latus ^ M'Coy; Maclurea magna, 

 Le Sueur, a Chazy limestone species. Locality. — Aldens on 

 the Stincher. Orthoceras annellatum, Hall, a Trenton lime- 

 stone species ; Orthis ? simplex, M'Coy ; Graptolites, traces of. 

 Locality. — Ardwell on the Stincher. Orthis conjinis, Salt, ; 

 Orthis a species allied to undulata. Locality. — Colmonel on 

 the Stincher. Orthoceras politum, M'Coy ; Orthis testudi- 

 naria, Dal. ; O. simplex, M'Coy ; Leptcena sericea. Sow. ; 

 Trochus lenticularis, Sow. Locality. — Glenquhapple, Upper 

 Stinchard. Atrypa hemispherica, Sow. ; A., pulchra, Sow. ; 

 Tentaculites annulatus, Schlot. ; Ptilodictya {Stictopord) costu- 

 lata, M'Coy. Locality. — Half a mile east of Girvan. 



Fourth, or North Girvan Group. 



EccuUomphalus Scoticus, M'Coy ; Bellerophon dilatatus. 

 Sow. ; Murchisonia cancellatula, M'Coy ; M. simplex, M'Coy ; 

 Euomphalus tricinctus, M'Coy ; Trochus moorii, M'Coy ; T. 

 helicites. Sow. ; Modlolops'is semisulcata. Sow., sp. ; Orthis re- 

 versa. Salt. ; 0. testudinaria, Dal. ; O. filosa ; Atrypa hemi- 

 spherica, Sow., and some new species ; Illcenus Bosenbergii, 

 Eich. ; Calymene diademata, Bar. ; C. tuberculosa. Salt.; Palwo- 

 pora subtilis, M'Coy ; P. tubulosa, M'Coy ; P. favosa, M'Coy ; 

 Petraia cequisulcata, M'Coy ; P. subduplicata, M'Coy ; Ptilo- 

 dictya {Slictopora) costulata, M'Coy. Localities. — Dalquharran, 

 Mulloch, Drum Muck, &c. Maclurea macromphata, M'Coy, 

 very common; Palceopora favosa, M'Coy; Atrypa, n. s. ; 

 Leptcena, allied to alternata, Trenton limestone species ; Or- 

 this, allied to pectinella, Trenton limestone species. Locality. 

 — Craig Head Quarry. 



Fifth, or Balmae Group. 



Murchisonia, allied to M. gracilis, a Trenton limestone 

 species ; Orthis lynx, Eich., var. ; Leptcena alternata, Tren- 

 ton limestone species ; Orthonota inornata, Phill. ; Graptolites 

 Sagittarius, Linn. ; C, Ludensis, Murch. 



