Vol. 6.7.] SALOPIAN KOCES OF CATJTLEY AND RAVENSTONEDALE. 235 



with the one most completely figured by him in ; Skanes Grapto- 

 liter ' pt. ii, 1883, pi. iv, fig. 12. Previously 1 we have called 

 this species C. symmetricus, Elles. 



Figs. 2 & 3. — Cyrtograptus rigidus, Tidlb. x 2. 



^^^^^^^2^m^^ 



[2, coll. J. E. Marr ; 3, from Near Gill.] 

 MONOGRAPHS WANDALENSIS, Sp. nOV. (fig. 4). 



Polypary. — Maximum length observed = 2'5 mm.; width at 

 proximal extremity = 0*5 mm., increasing to a maximum of 1*5 mm. 

 at the distal end. Curvature dorsal, variable in amount, in some 

 specimens much marked at the proximal end. 



Fig. 4. — Monograptus wandalensis, sj). nov., rom Wandale Hill. 



[A = Proximal extremity, X2; B = Proximal extremity, showing part of 

 sicula, X 2; C = distal thecae, showing growth-lines, X 5.] 



Thecae. — Thirteen in 1 cm. ; inclined to the axis at an angle 

 of 35°. The thecae show a tendency to narrow towards the aper- 

 ture. Apertural margin concave. Overlap of thecoa a half to two- 

 thirds of their length. 



This form may be readily distinguished from all other Ludlow 



1 Geol. Mag. dec. 5, vol. vii (1910) p. 473. 



