400 



BRITISH GRAPT0LITEF5. 



LmUow District : Elton-Ludlow Road ; Elton Lane. Staffs.: Walsall; Wren's 

 Nest, Dudley. Welsh Borders : Aberedw Hill, Builtli ; Uclieldre Stream, Long 

 Mountain. 



Associates. — Monog. ehimsera occurs typically in tlie zone of M. scanicns, 

 associated with tlie zone fossil and M. Boemeri, but it is also found at a somewhat 

 lower horizon with M. Nilssonl, M. hohemicus, and M. diibbis. It is not a very 

 abundant fossil. 



Collections. — Lapworth, University of Birmingham, Wood. 



Var. Salweyi (Hopkinson MS.). Plate XXXIX, figs. 5 a—d. 



1880. Monographis Salweyi, Lapworth, Ann. Mag. Nat. Hist. [5], vol. v, p. 150, pi. iv, fii^-s. 2 a — h. 

 1884. Monocjraptus chbn;vra, J. D. La Touclie, Handbook to the Geology of Shropshire, p. 71, 



pi. xviii, fig. 571. 

 1900. Monograptns chim<vra, var. Salweyi, Wood, Quart. Journ. Geol. Soc, vol. Ivi, p. 472, text-fig. 



18, pi. XXV, figs. 19 A, B. 



Figs. 2G7 a and b. — Mnnorirajdus rhim- 

 tera, var. Salweyi (Hopkinson). 



^•i»' - 



Monoff. cliimpern var. Saln-eyi was originally named by Hopkinson as a distinct 



species, and his type specimen, which shows only 

 the distal extremity, Avas figured by Lapworth. 



As Wood, however, has already shown (loc. cit. 

 siijn-a), the collection of more material from the 

 type locality has revealed the close connection be- 

 tween this form and M. chima'va, and it is best 

 regarded as a variety of the species last described. 



Var. Salweyi differs from M. ehimsera itself in — 

 (1) Its smaller size — it appears rarely to exceed 

 1'3 cm. in length and 1*G mm. in breadth ; (2) 

 the straighter character of the proximal end ; (3) 

 the longer, slender, and more flexed thecal spines, 

 which may be fully 1 mm. in length. The virgula 

 is nsually a conspicuous feature at the distal end of 

 the polypary. 



Horizon and. Localities. — Lower Ludlow Shales 

 (zone of M. Nilssonl). 



Ludlow District : Stormer Hall, near Leint- 

 wardine ; Elton-Evenhay Lane. Tjong Mountain : Lettygynfach. 

 Collections. — Hopkinson, Wood. 



H < ^ ' — ^^ 



a. Complete specimen, showing sicula. 

 Figured Quart. Journ. Geol. Soc, 

 vol. Ivi, p. 473, fig. 18 a. Stormer 

 Hall, nr. Leintwardine ; Lower 

 Ludlow Shales. Coll. Wood. 



h. Distal thecffi, showing thecal spines. 

 Ibid., fig. 18 6. 



