MONOGRAPTUS. 



Monograptus crinitus, AVood. Plate XLIV, figs. 3 a — c. 



1900. Monograptus crinitus, Wood, Quart. Journ. G-eol. Soc, vol. lvi, p. 480, pi. xxv, tigs. 26 a, b, 

 text-figs. 23 a — d. 



Polypary irregularly flexed, very slender, 8 cm. or more in length, widening 



from a thread-like proximal end to a maximum breadth of about - 4 mm. 



Thecge five to seven in 10 mm., of the type of those of M. scanicus but 



far more slender. Overlap insignificant. 



Description. — The polypary must have attained a considerable length, but 



only fragmentary specimens are found ; this is not at all surprising considering its 



thread-like nature. The flexure is irregular ; some 

 Fx«s. 298 a -c.-Oonograptus crinitus, f ragments are practically straight, others convexly 



curved ventrally ; the greater number, however, 

 show ventral curvature with the thecas on the con- 

 cave margin. The general appearance of the species 

 as presented on the rock is that of a tangle of hairs. 

 The sicula has a length of about 1/5 mm., and 

 j u th. 1 arises about half-way along its length. 



The thecge all show a beak-like apertural ter- 

 i ruination like that of M. scanicus, but are far more 



a b c elongated and drawn out, the ventral walls running 



a. Fragment showing- sicula. Figured almost parallel with the line of the axis of the 



Quart. Journ. Geol. Soc, vol. lvi, 



p. 481, fig. 23 b. Lower Winning- polypary. 



ton Lane, Long Mountain ; Lower . ,, . . -. . . . . . . a± • ,• 



Ludlow shales. Coil. Wood. Affinities. — Monog. en nit ns shows distinct amnities 



b. Proximal thecse. Enlargement of ..-, .-, ,-, ■, -, -, r . . n , • ,-, 



part of pi. xliv, fig 3 6. with the other slender Monograpm belonging to the 



c. More distal thecae. Enlargement of p ir • 7 i if 7 7 •,• T? ^ HT 



part of pi. xliv, fig. 3 « groups of M. prwdou and M. lobiferus. From M. 



gemmatus it may, however, be readily distinguished 

 if the thecge are well preserved, since there is no definite hook as in that species, 

 and from M. Barrandei it differs in the characters of the thecae, the latter having 

 more or less definitely coiled-up lobes at their apertural terminations. 



Horizon and Locality. — Lower Ludlow Shales (zone of M. Nilssoni). 



Shropshire. — Lower Winning-ton, N. side of Long Mountain. 



Associates, etc. — Monog. crinitus has been found in some abundance at Lower 

 Wilmington, where it occurs in the zone of M. Nilssoni in association with Monog. 

 Nilssoni, M. various and EetioHtes (Gothog.) spinosus. 



Collections. — Sedgwick Museum, Wood. 



Monograptus -Jaekeli, Perner. Plate XLIV, figs, la— b. 



1899. Monograptus Jaekeli, Perner, Graph de Boheme, pt, iii b, p. 4, pi. xv, figs. 1, 6—10, 20, 22, 

 24, 27, and text-fig. 8. 



