32 BRITISH PALAEOZOIC PHYLLOCARIDA. 



PI. IX, fig. 3. Part of an ultimate segment and caudal appendage (telson) 

 crushed and imperfect. The former shows strong, sharp, longitudinal, inoscu 

 lating wrinklets ; the latter, consisting of a broken telson, ridged and furrowed, 

 shows at its articular or proximal end nearly straight, feeble, but rather wide 

 wrinkles running down into the ridges, as in fig. 2. 



In the Museum of Practical Geology, marked x ■^. Grey mudstone, 

 brownish on one face, greenish elsewhere, finely micaceous, and partially cal- 

 careous ; with casts of Polyzoa, small Brachiopoda, &c. Upper Ludlow Beds ; 

 Whitcliffe, Ludlow (old wall). Collected by Mr. Lightbody. 



9. Ceeatiocaeis Lddensis, H. Woodward, 1871. PI. I, and PL IX, figs, la, lb. 



1871. Ceeatiocaeis Ludensis, if. Woodward. Geol. Mag., vol. viii, p. lOJ^, pi. 3, 



fig. 3. 



1884. — — Jones and Woodward. Geol. Mag., dec. 3, vol. i, 



p. 396. 



1885. — — T.S.J.^ H. W. Third Eeport Palffioz. PhylL, 



Brit. Assoc, p. 341 ; Geol. Mag., dec. 3, vol. ii. 

 No. 9, September, 1885, p 392. 



1886. — — T.R.J.Sf H. W. Fourth Eeport, p. 230 ; Geol. 



Mag., dec. 3, vol. iii, p. 457. 



This large and indeed gigantic Ceratiocaris, represented by seven abdominal 

 segments, with the caudal appendages of telson and two stylets, in the Ludlow 

 Museum, was described in the ' Geol. Mag. ' for March, 1871, and illustrated with 

 a reduced figure. The carapace is there estimated as having probably been eight 

 inches in length. The segments giving eight inches, and the telson having been 

 probably more than nine inches in length (possibly much more, see p. 34), the 

 animal was more than two feet in total length. As pointed out in the paper 

 referred to, the telson, as estimated, is certainly the longest known ; for we find 

 the relative proportions to be — for C. Ludensis, H. W., l-ii; C. Murcliisoni 

 (Agass.), 128 (as defined above); G. Deiceii {J. Hall), 100; G. Bohemica, Barr. 

 (Brit. Mus.), 84; G. stygia, Salter, 32; C. iVcBi/m^i, F. Schmidt, 26 ; C. papilio, 

 Salter, 16. 



The segments are ornamented along the back with imbricated or lattice-like 

 raised angular lines, which pass downwards on the sides into oblique and then 

 curved wavy lines, and these form an irregular reticulation at the anterior 

 margin. The ultimate segment was cylindrical, and is striated longitudinally 

 with interrupted and inosculating hnes. The caudal spines are stout, tapering 

 slowly, slightly curved inwards (downwards), and delicately ribbed ; and one bears 

 some marks of the bases of setae or prickles (p, in PI. IX, fig. 1 a). 



