MONOGRAPTUS. 397 



the proximal curvature is very slight, the sicula extends to nearly the level of 

 the aperture of th. 3, and the thecse are very closely set (sixteen to fourteen 

 in 10 mm.). 



Horizon and Localities. — Lower Ludlow Shales (zones of M. Nilssoul and 

 M. scanicus). 



Ludlow District: Elton Lane ; Elton-Evenhay Lane; Stormer Hall; Abberley 

 Hills. 



Associates, etc. — Var. ptimilm has a very characteristic gregarious habit, often 

 occurring in dense crowds on slabs of rock almost to the exclusion of any other 

 form. It occurs in the zone of M. Nilssoni associated Avitli the zone fossil, 

 M. colonus var. compactas, M. dahliis, and M. variaas ; and in the zone of M. 

 scanicus with M. scanicus, M. chimitira, and 3f. clilmaira var. Salweiji. 



Collections. — Sedgwick Museum, Wickham King, and the Authors. 



Monograptus Roemeri (Barrande). Plate XXXIX, figs. 2 a — d. 



1850. GrajitoUfhus Uveineri, Barraude, Grraptolites de EolK-me, p. 4-1, pi. ii, figs. 9 — 11. 



1869. Mvnoijraiilus Roaineri, Heideuhaiu, Zeitsdir. d. deutscb. geul. Gesellsch., vul. xxi, p. 150, 



pi. i, fig. 5. 

 1879. Graptolithus colviius, Queustedt, Petrefactenkuude Deutschl., vul. vi, pi. cl, tig. 40. 



1883. ? Monograptus colonus, Tullberg, Skaaes G-raptoliter, pi. i, fig. 21. 



1884. Monograptus Eauueri, J. D. La Touulie, Handbook to the Geology of Shropshire, p. 78, 

 pi. xviii, fig. 578. 



1897. Pristiograptus Eoeineri, Freeh, Lethsea Geoguostica, pt. iii, p. 656, fig. 210. 



1899. Monograptus Rosmeri, Peruer, Etudes sur les Graptolites de Boheuie, pt. iii, sect, h, p. 8, 

 pi. xiv, figs. 1, 7, 10, 18, 24, text-fig. 11. 



1900. Monograptus Boemeri, Wood, Quart. Jouni. Geol. Soc., vol. Ivi, p. 470, text-fig. 17, pi. xxv, 

 figs. 13a, 13b. 



Polypary 3 — 8 cm. in length, with slight ventral curvature proximally and 



slight dorsal curvature distally, increasing rapidly in width at first and 



then more gradually till the maximum breadth of about 3 mm. is attained. 



Tlieca? sixteen to eleven in 10 mm. ; two proximal ones with retroverted 



apertural extremity ; the rest approximately straight-walled simple tubes 



increasing in length distally till they measure 4 mm. or more in length, five 



or five and a half times as long as wide, overlapping fully two-thirds their 



length, and having an average inclination of 40° to 45°. 



Description. — The form of the polypary of Monoij. Iboemerl witli its slight double 



curvature is highly characteristic, as is also its rapid increase in width in the 



proximal portion. 



The sicula has a length of about 1"8 mm., and it extends well above the 

 apertural margin of the second tlieca. 



