I 



i860. 

 1867. 



1873- 

 1877. 



460 Frof. T. Rupert Jones and Dr. S. Woodward— 



The state of the case is therefore as follows : In the Fhjllograptus- 

 schists light grey, shining Graptolites are associated with numerous 

 small, rounded bodies of the same colour, and with isolated, larger, 

 black, lustreless Brachiopoda. In the zone of Didymograptus Murchi- 

 soni we meet with light grey, shining Graptolites associated with 

 numerous small, rounded Brachiopoda, with a lustreless, black surface, 

 with a few isolated, larger, black, lustreless Brachiopoda. 



This brings to a close the considerations upon the organization and 

 economy of the Graptolites. We have taken as the starting-point 

 the often cited section in Zittel's " Handbuch der Palaontologie," 

 and refrained from repeating here all those newer views which are 

 referred to in it, and which did not call for any comment. 



IV. — Notes on the British Species of Ceratiocabis. 



By Prof. T. Eupeet Jones, F.E.S., and Henry Woodward, LL.D., F.E.S. 



{Concluded from September Number, p. 397.) 



5. Ceratiocakis inornata, M'Coy. 



1851. Ceraiiocart's mortiattis {Salter MS.), M'Coy. Brit.Pal.Fos. p. 137, pi. iE.f.4. 



1854. ,, ,, Morris. Catal. Brit. Foss. 2nd edit. p. 102. 



Salter. In Siluria, 2nd (3rd) edit. p. 532. 



Salter. Ann. Mag. Nat. Hist. ser. 3, vol. v. p. 156. 



Salter. In Siluria, 3rd (4th) edit. p. 516. 



Salter. Catal. Camb. Sil. Foss. pp. 177, 178. 



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

 This is the third of M'Coy's original species. The specimen in 

 the Cambridge Museum has its carapace ovate-oblong or somewhat 

 boat-shaped in outline, 50 mm. (2 inches) long, 18 mm. high ; 

 moderately convex ; straight or very slightly arched above and more 

 strongly arched below (both edges are partly imbedded in the matrix 

 of the original specimen, b/5, M'Coy's fig. 4). The anterior end 

 (damaged) was neatly rounded, sloping up gracefully from below. 

 The posterior is obliquely truncate from above downwards and 

 outwards, with the postero-dorsal angle distinct, and the postero- 

 ventral angle prominent and blunt. There is no eye-spot. Traces 

 of longitudinal strise are visible on the impressions of the valves in 

 the grey, micaceous, Upper-Ludlow sandstone, from Benson Knot, 

 near Kendal, Westmoreland ; two specimens (one of them good) are 

 in the British Museum, No. 44342, from the same locality. 



The foregoing description does not quite tally with the account of 

 the species in the Brit. Pal. Foss. p. 137, nor with that in the Ann. 

 Mag. N. H. I.e., but is based on the original specimen, and not on the 

 restored figure in the Brit. Pal. Foss. The figure annexed by Mr. 

 Salter to his note on C. inornata in the Catal. Camb. Sil. Foss. 1873, 

 p. 178, is used also in connection with two other species at p. 16 and 

 p. 164. In the latter case it is probably intended for C. leptodactylus, 

 which we recognize as G. Murchisoni. 



C. inornata approaches C. papilio in form in some cases, but we 

 think that they are quite distinct species. There are some small 

 carapaces, one from Lesmahago, B.M. 59648, very near to C. papilio 

 in form, and measuring 34 x 13 mm., and one from Benson Knot, 

 B. M. 44342, measuring 35 X 14 mm. These proportions are dif- 



