392 Prof. T. Rupert Jones and Dr. H. Woodward — 



2. Ceratiocaris ludensis, H. Woodward. 



1871. Ceratiocaris ludensis, H. Woodward. Geol. Mag. Vol. VIII. p. 104, PI. 



III. Fig. 3. 

 1884. Ceratiocaris ludensis, Jones and Woodward. Geol. Mag. Dec. III. Vol. 



I. p. 396. 



This large and indeed gigantic Ceratiocaris is represented by seven 

 abdominal segments, with the caudal appendages of telson and two 

 stylets, in the Ludlow Museum, and has been 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 being 

 about nine inches in length, the animal would be more than two feet 

 in total length. As pointed out in the paper referred to, the telson 

 is certainly the longest known. Thus we find the relative propor- 

 tions to be for C. ludensis, H. W., 144 ; C. Murchisoni (Agass.), 

 128 (as defined above); C. JDeweii (J. Hall), 100; C. bohemica, 

 Barr. (Brit. Mus.), 84; C. stygia, Salter, 32 ; C. Ncetlingi, F. Schmidt, 

 26 ; C. papilio, Salter, 16. 



The segments are ornamented along the back with imbricated or 

 lattice-like, raised, lines, which pass downwards on the sides into 

 oblique and then curved wrinkles, and sometimes form a reticulation. 

 The ultimate segment is striated longitudinally with interrupted and 

 inosculating lines. The spines are stout, tapering slowly, slightly 

 curved inwards (downwards), delicately ribbed, and bear close-set 

 marks of the bases of small spines between or on some of the ridges. 



This fine specimen is imbedded in the greenish-grey, sandy, lami- 

 nated mudstone of the Lower Ludlow series, at Church Hill, Leint- 

 wardine, near Ludlow, with Graptolites. It was found by the late 

 Mr. H. Pardee, and is preserved in the Ludlow Museum. 



3. Ceratiocaris papilio, Salter. (PI. X. Fig. 1.) 



859. Ceratiocaris, Salter. In Murcliison's Siluria, 2nd (3rd) edit. p. 262, wood- 



cut fig. \, p. 538. 



860. Ceratiocaris papilio, Salter. Ann. Mag. Nat. ser. 3, vol. v. p. 154, wood- 



cut fig. I, and p. 155. 

 865. Ceratiocaris papilio, Salter and II. Woodward. Catal. and Chart Foss. 



Crust, p. 17 (not fig. 5). 

 865. Ceratiocaris papilio, H. Woodward. Geol. Mag. Vol. II. p. 403, PI. 11, 



Figs. I and 2. 

 867. Ceratiocaris papilio, Salter. In Siluria, 3rd (4th) edit. p. 236, woodcut 



fig. I (not fig. 2), and p. 516. 

 873. Ceratiocaris papilio, Salter. Catal. Camb. Sil. Foss. p. 178. 

 873. ,, ,, R. Etheridge, jun. Mem. Geol. Surv. Scotl. Expl. 



Map 23, pp. 55, 56. 



876. Ceratiocaris papilio, Armstrong and others. Catal. W.-Scot. Fossils, p. 24. 



877. ,, ,, H. Woodward. Catal. Brit. Foss. Crust, p. 71. 



878. ,, ,, Huxley and Etheridge. Catal. Camb. Sil. Foss. p. 142. 



Of the two species, so abundant in the Upper-Ludlow Shales of 

 the Logan Water, near Lesmahago, in Lanarkshire, and described 

 (unfortunately without good figures) by J. W. Salter in the Ann. 

 and Mag. Nat. Hist, for March, 1860, we have examined many good 

 specimens. As mentioned by Salter, one ( C. papilio) has the cara- 

 pace more oblong than the other (C. stygia), which is deepened by 



