Notes on Fhyllopodiform Crustaceans. 393 



decidedly Mesozoic aspect. These Lebanon beds I would correlate 

 with the similar beds above referred to near Edl'ou in Egypt, rather 

 than with the Nubian Sandstone. 



On the whole, therefore, it would seem that we may have in 

 Upper Egypt and in Sinai an Upper Paleeozoic sandstone, perhaps 

 supporting a not dissimilar sandstone of Lower Cretaceous age ; and 

 that the deposits which have been known by that name in the 

 Lebanon are altogether distinct, and belong to the Cretaceous ligni- 

 tiferous zone. 



II. — Notes on Phyllopodifokm Crustaceans, keferable to the 



Genus EcRmooARis, from the Paleozoic Rocks. 



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



(PLATE XIII.) 



TN 1863 Professor James Hall described and figured ^ three 

 abdominal segments, with the telson and its appendages, of a 

 Ceratiocaridal Crustacean, characterized by its relatively large size 

 (about 100 mm. long, and from 10 to 15 broad) and by the presence 

 of strong spines on the distal upper edge of each segment [see an- 

 nexed Plate, Fig. 2]. This form, from the shales of the Hamilton 

 group (Devonian) of Ontario County, N.Y., he referred with doubt 

 to Ceratiocaris, and gave it the specific name " armntiis." At the 

 same time Prof. Hall described and figured - some separate caudal 

 spines, from the Genessee Slate, Ontario Co., as C. ? longicaudus, of 

 which his figs. 4, 5 and 6 may be the same as those of C. ? armatus ; 

 whilst fig. 7 seems to be two small body-segements and caudal 

 spines of some other Phyllopod. To these Prof. Hall added, in the 

 same plate, the figure of a relatively large Leperditioid carapace- 

 valve, doubtfully referred to Ceratiocaris as G. ? pimctatus,^ from the 

 Hamilton Group, east shore of Cayuga Lake, N.Y. 



In 1876, Prof. Hall reproduced the figs. 1, 2, and 8, as figs. 4, 5, 

 and 7 in plate 28 of his " Illustrations of Devonian Fossils," pub- 

 lished in advance of the " Geological Survey of the State of New 

 York, Palaeontology," vol. v. part 2. Prof. Hall intimates, in the 

 explanation of the plate, that the carapace-valve perhaps belongs 

 to Barrande's genus Aristozoe ; and he adds this note : — " As this 

 sheet is going to press a specimen has been found, among some old 

 collections, which carries a carapace similar to the one figured, and 

 several joints of the abdomen, the latter similar in every respect to 

 corresponding parts of Ceratiocaris armatus." 



Hence we see that the two fossils belong to one species ; and, as 

 the name armatus stands first in the description and in the order of 

 the figures, it takes priority, besides being very appropriate. 



Another example of a Ceratiocarid with a spinous abdomen has 

 been published by Mr. R. P. Whitfield in his " Notice of New Forms 

 of Fossil Crustaceans from the Upper Devonian Rocks of Ohio, with 



1 " Sixteenth Report State Cab. New York," etc. Appendix D, p. 72, pi. 1, 

 figs. 1, 2, 3. 



■■* Op. cit. p. 73, pi. 1, figs. 4—7. ^ Op. cit. p. 74, pi. 1, fig. 8. 



