338 REPORT—1885. 
Owens College Museum. From near Ludlow. Style and stylets, not 
perfect, 105 mm. 
M. P. G. 323, ‘ Catal.’ 1878, p. 118. Leintwardine. Style, 103 mm. 
This and a piece of a carapace associated are labelled ‘C. tyrannus, 
Salter.’ 
Mr. Morgan’s collection : Cwm-y-sul, near Welshpool (Wenlock Shale). 
Fragment of style, with stylets, 95 mm. 
Ludlow Museum, P. Lower Ludlow; Trippleton, near Leintwardine, 
Lower part of style and stylets, 80 mm. 
Oxford Mus. B, telson about 105 mm. (more than 4 inches); also C 
and D. The head or proximal end of the telson is marked with longi- 
tudinal wrinkly lines. From near Ludlow. 
Broken pieces :— 
Murchison’s, fig. 10, pl. 4, ‘Sil. Syst.’ (fig. 1, pl. 19, ‘ Siluria’), 
Upper Ludlow beds. One piece measures 92 mm., and more, if the piece 
lying at its end belonged to it. 
Woodward's fig. 9 (M.P.G. +7, ‘ Catal.’ p. 84), Casterton, Low Fell, 
Kirkby-Lonsdale ; Wenlock Shale. Fragments, 50 mm. 
Cambridge Museum, 0/7. Upper Ludlow beds; Benson Knot, 
Kendal. Fragment, 43 mm. 
M. P. G. x 34, ‘Catal.’ p. 142. Upper Ludlow; Benson Knot, 
Kendal. Fragments, 40 mm. 
Cambridge Museum (Marr Coll.). Upper Coldwell beds = Wenlock; 
’ south of Coldwell quarry, Windermere. Part of style and ends of 
stylets, 40 mm. 
Small fragments, smooth (? Murchison‘) ; straight and ribbed ; curved 
and ribbed (? Murchisoni); M.P.G. x 35, 34, as; 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 OC. Murchisoni (the latter=Salter’s 
C. leptodactylus, in part, and his O. tyrannus and C. gigas) the last 
abdominal segment is striated with straight, somewhat inosculating, 
raised lines; and the other segments, where preserved, are similarly 
marked. A somewhat crushed specimen from Danefield, Kington, 
Herefordshire (Lower Ludlow), M. P. G. x 4 ‘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. Murchisoni; O leptodactylus being restricted to 
M‘Coy’s specimens and figs. 7, 7a, 7b, 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 O. Murchisoni. In this case a separate specific 
name is not required for them, and they shouid be merged in C. Murchi- 
soni, as arranged in H. Woodward’s ‘ Catal. Brit. Foss. Crust,’ 1877, 
pow. 
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 illustrative 
of the genus, is O. Murchisoni, as here defined. The eye-spot, however, 
and the hinge-‘oints are, in our opinion, superfluous and not sub- 
stantiated. 
