Notes on Sjoecies of Cemtiocaris. 389 



Owens College Museum, From near Ludlow. Style and stylets, 

 not perfect, 105 mm. 



M. P. G. ft, Catal. 1878, p. 118. Leintwardine. Style, 103 mm. 

 This and a piece of a carapace associated are labelled " C. tyr annus, 

 Salter." 



Mr. Morgan's Collection : Cwm-y-sul, near Welshpool (Wenlock 

 Shale). Fragment of style, with stylets, 95 mm. 



Lndlow Museum, P. Lower Ludlow ; TrijDpleton, near Leint- 

 wardine. Lower part of style and stylets, 80 mm. 



Specimens B, C, D, in the Oxford Museum, from the greenish-grey 

 mudstone near Ludlow, are also good tail-pieces. 



Broken pieces : — 



Murchison's fig. 10, pi. 4, Sil. Syst. (fig, 1, pi. 19, Siluria), Upper 

 Ludlow beds. One piece measures 92 mm,, and more, if the piece 

 lying at its end belonged to it. 



Fig. 9, PI, X. Geol. Mag, Vol. IIL (M. P, G. H, Catal. p. 84), 

 Casterton, Low Fell, Kirkby-Lonsdale ; Wenlock Shale. Frag- 

 ments, 50 mm. 



Cambridge Museum, hjl. Upper Ludlow beds; Benson Knot, 

 Kendal. Fragment, 43 mm. 



M. P. G, X -„V, Catal. p. 142. Upper Ludlow ; Benson Knot, 

 Kendal. Fragments, 40 mm. 



Cambridge Museum (Marr Coll.), Upper Coldwell beds=: Wen- 

 lock; south of Coldwell quarry, Windermere. Part of style and 

 ends of stylets, 40 mm. 



Small fragments, smooth (? MurcMsoni) ; straight and ribbed ; 

 curved and ribbed (? MurcMsoni) ; M. P. G. x -^q-j 'aXi sV '■> from the 

 Downton Sandstone ; Kington, Herefordshire. 



Strongly ribbed and pitted (=spinose), British Museum; Bury 

 Ditch, Salop ; and Oxford Mus. D, Ludlow. 



Both in M'Coy's C. leptodactylus and C. MurcMsoni (the latter 

 ^Salter's C. leptodactylus, in part, and his MS, C, tyrannus and C. 

 gigas) the last abdominal segment is striated with straight, some- 

 what inosculating, raised lines ; and other segments, where preserved, 

 are similarly marked, A somewhat crushed specimen from Dane- 

 field, Kington, Herefordshire (Lower Ludlow), M. P, G. x |-, Catal. 

 p. 141, showing a terminal segment with similar nearly straight, but 

 wriggly, inosculating, thin riblets, and ridged and fluted caudal 

 appendages, as far as preserved, has been labelled C. gigas by 

 Salter ; but this may well belong to the series here placed as C. 

 MurcMsoni ; C. leptodactylus being restricted to M'Coy's specimens 

 and figs. 7, 7a, 76, and a few other slender and simply striate forms. 

 The carapace belonging to these is not yet known. It is quite 

 possible that these rare and thinner styles and stylets may have 

 belonged to some variety of C. MurcMsoni. In this case a separate 

 specific name is not required for them, and they should be merged 

 in C. MurcMsoni, as arranged in H. Woodward's Catal. Brit. Foss. 

 Crust. 1877, p. 71. 



There is little or no doubt that the figure given by Mr. Salter in 

 the Catal, Cambr. Silur. Fossils, 1873, pp, 16, 164, and 178, as 



