486 W. J. SOLLAS ON THE SILURIAN DISTRICT 
Wenlock. | Ludlow. 
Bellerophon trilobatus, Sow. ............ * * 
Heculiomphalus levis, Sow. ............ * 
Murchisonia Lloydii, Sow. ........:.0066-|  ceeeee 
Pterinea Sowerbyi, M‘Coy .........20002-| vases 
tenuistriata, Coy). .....:...0c.0.000)|  veense 
Ohmrabiolks, iain, SIR, coocssosconose0n0cced| — gaaooe 
Orthoceras ibex, Sow. ...........ccseeeeees * 
josmellegenng,, SUK js5000ad0000800000004] . o00000 
sp. nov. 
Iinraeqeiley, Ibis, SCAM, cacsocoscoosneb00cGed|| | o0c000 
Orthis elegantula, Dalm. .............006.. * 
HOSP, ISIOCD),” abd obadoobunocubdodoooobdDe * 
Strophomena euglypha, Daim. ......... * 
depressa, Dali. .......c0.c.ceeeoeee- * 
Chonetes lata, Von Buch......cccccececee.|  ceceee 
Meee, IDET > cogooonsdosKsooc0oD0c|  sogood 
Leptzena leevigata, Sow. ....2......220000] sea eee 
Rhynchonella nucula, Sow..............-: * 
borealis SCHL Pa een teneec peice * 
* 
* 
KK OK OK OK °K 
2K OK OK OK OK CK OK OK 
KKK OK KOK OK OK XK 
Phacops caudatus, Briinn. .........06066- 
Calymene Blumenbachii, Brongn. ...... 
leloprnrlkonoyguiss Gauls atl, JCI, Gocnopoas||. cocaoo || sooonc 
drachyderma|squamosayc/01 que needs || eeseeee tilde ener 
Syringopora serpens, Linm..........0..0 * * 
Monticulipora Fletcheri, 2. g Hl. ......|  ...... % 
Cyathophyllum pseudoceratites, M‘Coy| ...... * 
Worm-burrows and worm-tracks. 
Kk Kk KOK kK ok Ok OK OK 
* OK OK 
On the evidence of these fossils we may safely refer the beds in 
which they occur to the Ludlow series, and on stratigraphical 
grounds to the lower part of that series. 
To this series belongs also a peculiar red ferruginous bed which 
crops out near the end of the ditch on the right-hand side going up 
Rhymney hill. It contains, amongst others, the following fossils :— 
Strophomena filosa, Sow, Pterinea, sp. 
applanata, Salt. Phacops caudatus, Briinn. 
Atrypa reticularis, Linn. Proétus latifrons, M‘Coy. 
Orthis lunata, Sow. Petraia bina, Lonsd. 
Sowerbyana, Dav. Cyathophyllum, sp. 
Rhynchonella nucula, Sow. Nidulites favus, Saiz. 
Chonetes, sp. Syringopora bifurcata, Lonsd. 
Mytilus exasperatus, Sal¢. Ptilodictyum, sp. 
The succeeding beds are to a great extent concealed for about 
140 feet, measured vertically above the top of the preceding expo- 
sure ; but wherever they can be seen they present the same characters 
as those just described. After passing this broken ground we meet 
with several feet of clearly-exposed greenish-grey mudstones, 
abounding in fossils, of which the following list gives but a very 
poor idea :— 
