800 



BRITISH GRAPTOTJTES. 



Horizon ainl JaxuiIHIcs. — lilaiiduvery (Birkliill Sliales), .siil)-zone of M. (irf/ciifciis 

 and zone of il/. coniwlvhis. 



S. Scotland: Dohb's Linn, Bolcraig Burn, etc. Lal-r J)isfrict : Skelgill. 

 C. ]V((les : Rlieiclol Gorge. iV. ]V<(Ies : Parj's Mountain, Anglesea. 



Associates, etc. — Var. ci/(jii('u.s appears to l)e a commoner form than M. (iiy/cnffii.^, 

 and takes its place more or less com|)letely in S. Scotland. It is commonly found 

 with Monog. IrpfofJirca and M. roncinnns; and in the Lake District it occurs with 

 M. argenteus itself. 



Collections. — Sedgwick Museum, Geological Survey of England and Wales, 

 British Museum (Natural History), Greenly, Jones, and the Authors. 



Monograptus limatulus, Toruquist. Plate XXXVIII, figs. 7 a — d. 



1892. Monof/rajitus Umaiiilvs, Toruquist, 

 pi. i, figs. 6 — 8. 



Figs. 259 a — c. — Monograptus li)natidus, 

 Tornquist. 



a. Proximal portion of jxilypary, inn inly preserved 



as a fast. Llanystwiiidwy, near Criccieth ; 



Llandovery Beds. Coll. Fearnsides. 

 h. Specimen, showint; the proximal theca;. Skel- 



f^ill; Stockdale Shales (zone of Monog. con- 



vohitus). Sedgwick Museum. 

 c. Small proximal fragment in relief. Rheidol 



Gorge, Cardiganshire. Geol. Survey of 



England and Wales. 



Siljansomr. Grajit., Acta Univ. Luud., vol. xxviii, p. 9, 



1897. ? Monograptus limatulus, Peruer, Etudes sur 

 les Graptolites de Boheme, pt. iii, sect, a, p. 10, pi. 

 xiii, fig. 9. 



1899. Monograptus limatulus, Toruquist, Mouograp- 

 tidse of Scaniau Rastrites Beds, Lunds Univ. Ai"ssk., 

 vol. XXXV, pt. 2, no. 1, p. 14, pi. ii, figs. 18 — 20. 



Polypar}'- short, not exceeding 4 cm. in 

 length, arcuate or straight distally, 

 stiffly and abruptly recurved in proxi- 

 mal ])ortion ; very slender and thread- 

 like at origin, but widening abruptly 

 and rapidly at the bend to a maximum 

 breadth of about 1 mm. Thecte twelve 

 in 10 mm,; those of the proximal 

 portion in contact only, with slightly 

 curved walls and slightly retroverted 

 apertural margins ; those of the distal 

 portion sim})le tubes, overlapping one- 

 half their length, with even everted 

 apertural margins. 

 Description. — The form of the polypary 

 with its stiff and al)i-upt recurvature, and 

 slender proximal portion is highly character- 

 istic of this species; so slender, indeed, is 

 the polypary at its proximal extremity that 

 it sometimes appears to taper to a mere 



