PLATE XXXVIII. 



Monogr^iptvLS—rontinued. 

 Figs. 



1 a — e. — Monogntptus revolntus, Kurck. (Page 384.) 



la. Typical specimen, impression. Garple Linn, near Moffat. Lower 



Birkhill Sliales. Geological Survey of Scotland, Edinburgh. 

 1 h. Less complete specimen. Dobb's Linn. Birkhill Shales (zone of 



M. cijpliiis). Wood's Collection. 

 1 c. Proximal portion. Garple Linn, near Moffat. Lower Birkhill 



Shales. Geological Survey of Scotland, Edinburgh. 

 1 d. Specimen in relief. Rheidol Gorge, 235 yards S. of Bryn- 



chwith Farm-honse, Pont Erwyd. Rheidol Group. Geological 



Survey of England and Wales. 



1 e. Broad specimen (?). Lateral Gorge, Dobb's Linn. Birkhill 



Shales (zone of M. cyplius). Lapworth's Collection. 



2 a — c. — Monograptus revolntus, var. austerus, Tornquist. (Page 385.) 



2 a. Typical specimen. Long Cliff, Dobb's Linn. Birkhill Shales 



(zone of M. ci/phus). Wood's Collection. 

 2 b. Proximal portion. Dobb's Linn. Birkhill Shales. Elles' 

 Collection. 



2 c. Proximal fragment. Coalpit Bay, Donaghadee, Co. Down. 



Llandovery Beds. Elles' Collection. 



3 (I, h. — Monogmpins revolntus, var. prsecursor, Elles and Wood, var nov. 



(Page 386.) 



3 a. Type specimen, in full relief. Rheidol Gorge, 420 yards E.S.E. 



of Bryn-chwith Farm, Pont Erwyd. Rheidol Group. Geolo- 

 gical Survey of England and Wales. 



3 h. Incomplete specimen, doulitfully referred to this form. Dobb's 



Linn. Birkhill Shales. Lapworth's Collection. 



4 a —d. — Monograptus diffovmis, Tornquist. (Page 386.) 



4 a. Fairly complete specimen, in relief. Dobb's Linn. Birkhill 



Shales. Lapworth's Collection. 

 4 h. Smaller specimen. Dobb's Linn ?. Birkhill Shales. Lapworth's 



Collection. 

 4 c. Characteristic specimen. " Rheidol Gorge, S. of Bryn-chwith 



Farm, Pont Erwyd. Rheidol Group. Jones' Collection. 



4 d. Broader specimen, doubtfully referred to this species. River 



Twymyn, near Llanbrynmair. Dolgadfan Beds. Wood's 

 Collection. 



5 a — d. — Monograptus argenteus (Nicholson). (Page 388.) 



5 a. Specimen in full relief. Skelgill. Skelgill Beds (band of M. 



argenteus). Lapworth's Collection (presented by H. 0. 

 Nicholson). 



5 h. Similar specimen, in part relief. Skelgill. Skelgill Beds. Sedg- 

 wick Museum (Marr's Collection). 



5 c. Narrower specimen, showing more of proximal portion. Skelgill. 

 Skelgill Beds. Lapworth's Collection. 



5 d. Specimen, showing longer proximal portion. Ibid. 



