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MK, C. A. MATLEY ON THE 



[Aug. 1899, 



(y) Dicranograptus-heds of Penterfyn. — Near a cottage 

 called Penterfyn, south of Ogof Gynfor, are small quarries in flaggy 

 ironstone interstratified with black, often pyritous, shales, some of 

 the layers of which are crowded with Dicranograptus : — 



Ccenograptus gracilis, Hall. 

 Crypto (J raptus tricoi-nis, Hall. 

 Dicellographis intortus, Lapw. 

 Dicellograptus sp. 



Climacograptus Scharenhergi, Lapw. 

 Bicraiiograptus ramosus, Hall. 



Dicranograptus rectus, Hopk. 

 Diplograptus teretiusculus, Tullb., or 



euglyphus, Lapw. 

 I)idyr)iograptus sp. 

 Lingula hrevis, Portl. 



(^) At Ogof Gynfor, in pebbly grits, the following occur : — 



Strophomena, cf. Stropheodonta imbrex, 

 var. semiglohosina, Dav. 



Orthis or Ehynchonella (imperfect), 

 large form with very strong ribs. 



Ehynchonella sp. 



Crinoid-ring. 



Trace of a trilobite. 



Orthis vespertilio, Sow. 



{Balmanella) testudinaria, Dal. 



conjinis, Salter (?). 



calligramma, var. Carausii, 



Salter. 

 (?), small species with simple ribs. 



(e) At 100 yards east of Ogof Gynfor, in similar beds ;- 



Orthis vespertilio, Sow. 



(?), small species with simple ribs. 



Ehynchonella sp. 

 Lamellibranchs, cf. Ctenodonta. 



(<C) At 120 yards north of Ogof Gynfor, near the boundary-fault. 

 Beds similar to h and e yielded Lingula, cf. tenuigranulata, M'Coy. 



(rj) Craig Wen tramway. In ashy-looking flaggy beds Prof. 

 Huglies found Orthis Bailyana, Dav. 



I have also obtained : — 



Orthis calligramma, var. Carausii, I Orthis, cf. confit 

 Salter. | sp. 



Salt. 



(0) Limestone-blocks in Ordovician breccia, at the western Perth 

 Padrig, north-west of Mynachdy, yielded : — 



Stenopora (Favosites) fibrosa, Goldf. 

 Solenopora compacta, Bill. = Tetra- 



diiim Feachi, Nich. & Eth. jun. 

 Frasopora Graycs, Nich. & Eth. jun. ? 

 Monticuliyora sp. 

 Orthis, perhaps 0. calligramma or 



0. flabellulum ? 

 ? Operculum of a Maclurea resembling 



M. matutina. Hall. 



Operculum of a Maclurea Uke M. Lo- 

 gani, Salt., or M. Feachi, Salt. 



Large gasteropod, ? Maclurea. 



Crinoid-stems and ossicles. 



Cast of a portion of a trilobite 

 resembling lllcBnus. 



(ii) Notes on the Northern Fossils. 



The graptolites which have been identified by Prof. Lapworth 

 and Miss E. M. E-. Wood are all typical Glenkiln forms, and the 

 black shales in which they occur may be assigned to the Upper 

 Llandeilo, or the Lower Bala of some authors. The accompanying 

 brachiopods, Lingula brevis and Paterula balcletchiensis, are also 



