44b 



BRITISH GRAPTOLITES. 



Monograptus M'Coyi, Lapwortli. Plate XLIV, figs. 9 a and b. 



1877. Monograptus M'Coyi, Lapwortli, Proc. Belfast Nat. Field Club, p. 130, pi. vi, fig. 2. 



Pig. 306. — Monograptus M'Coyi, 

 Lapwortli. 



The specimen upon which this species was founded is re-figured on Pi. 



XLIV, fig. 9 a, so that there may be no doubt of 

 its identity. It is, however, so poorly preserved 

 that little or no detail can be made out, and certain 

 features lead us even to be doubtful of its reference 

 to the genus Monograptus. There are, however, 

 certain broad lL(lli-\\ke forms which mierht be 

 referred to it, but we feel doubtful if these have a 

 more than local value (PI. XLIV, fig. 9 l>). 



The original specimen has a length of 7'5 cm. 

 and a maximum width of 3*5 mm. The thecae 

 number ten in 10 mm., and so far as can be made 

 S e v e T S V,- E « 1:u <rT meilt ( ' part of out approach the distal thecae of M. Ealli in 



PI. XLI\ , fij;. 9 b. i i 



their general characteristics. 

 Horizon and Localities. — Tarannon Beds. 

 Ireland: Tieveshilly, Co. Down. Scotland: Belcraig ?. 

 Collections. — Belfast Natural History Museum, Geological Survey of Scotland. 



Fragment doubtfully referable to this 



IV. B. 2: Monogvapti in which the thecae are bi-form and the polypary shows 



spiral curvature. 



Monograptus testis var. inornatus Elks. Plate XLIV, figs. 7 a and b. 



1900. Monograptus testis var. inornatus, Elles, Quart. Journ. G-eol. Soc, vol. lvi, p. 408, fur. 20. 



This British variety is a small Monograptus agreeing with Barrande's -1/. testis 

 in general form, but apparently differing in the minor characters of the thecae, 

 which are rather of the type of those of the proximal portion of M. SedgivicJcii, and 

 seem to be devoid of the long apertural spines which are so conspicuous a feature of 

 the Bohemian examples of j\f. testis. Nevertheless, the British specimens at present 

 known are not sufficiently well preserved to make it certain whether the thecae 

 might have spines like M. SedgwicHi (Fig. o07 L") or not; and they are all proximal 

 fragments, so that it is possible that in complete examples the spines may be 

 conspicuous in the distal region alone. The proximal thec-e of the Bohemian form 

 of .1/. testis are more distant, and never show the retroverted apertural regions 



