MACREROTTS DECAPOD IN THE LOWER CARBONIFEROUS. 867 



Apus dubius, Prestwich, is placed amongst the Phyllopods, with the 

 remark that perhaps it belongs to the Limulidce. 



1855. In the 5th edition of Sir C. Lyell's ' Elements of Geology,' 

 Mr. Salter figured one of Dr. Ick's before-mentioned fossils as 

 Glyphea dubia *, and considered it identical with Apus dubius, 

 Prestwich. 



1855. An important paper was contributed by Dr. H. Burmeister 

 on Gampsonyx fanbriatus, Jordan. According to this author the 

 name Gampsonyx was in use by Swainson for a genus of Falconidaa 

 before its adoption by Jordan for the above Crustacean ; Burmeister 

 therefore changed it to Gampsonyclms f . A very full description 

 is given in Burmeister's paper, accompanied by several figures. He 

 took it to be a Stomapod approaching in some characters to the 

 recent Schizopoda. 



1856 (51-). In the 3rd edition of the ' Lethsea Geognostica,' 

 Drs. H. G. Bronn and F. Pomer place Gampsonyx among the Stoma- 

 poda, adopting Burmeister's name Gampsonyclms %, They consider 

 that this genus unites by its characters the Amphipoda and Decapoda, 

 especially the subdivision Macrura of the latter. The distinct head 

 and thorax without any coalescence into a cephalothorax recalls the 

 Amphipoda; whilst the antenna?, appendages, and divisions of the 

 telson are especially Macruran. Palceocrangon, v. Schauroth, is placed 

 amongst the genera incertce sedis, and the authors doubt the pro- 

 priety of referring it to the Decapoda. The genus Bostrichqpus, 

 Goldfuss, is also placed here ; indeed, so careful are tlm authors in 

 this instance, that they merely call it a Crustacean §. 



1856. In their useful and complete work, ' Die Yersteinerungen 

 des rheinischen Schichtensystems in Nassau,' Drs. G. & F. Sand- 

 berger adopt Burmeister's view of Bostricliopus, that it is an Isopod, 

 and give a description and good figure of it ||. 



1857. The remains of the Macrurous Decapod mentioned by Sir 

 W. C. Trevelyan as found by Mr. J. W. Kirkby, were referred by the 

 latter to Schlotheim's Trilobites problematicus % ', but instead of adopt- 

 ing for it v. Schauroth's name of Palceocrangon, Mr. Kirkby proposed 

 a new one, Prosoponiscus. The author states that Mr. C. S. Bate 

 referred the form to the Isopoda, and considered that in the position 

 of the eye it differed from all larval and adult Isopods, but assumed 

 rather the former than the latter character. 



1857. When describing Pygocephalus Cooperi, Prof. Huxley ** 

 stated his belief that in it we had the first certain evidence of the 

 existence of the Podophthalmia at so early a date as the Carboni- 

 ferous ff ; it is probably allied to My sis, and should be placed 

 either amongst the lower Decapoda or Isopoda. " One end of the 

 body is much broader than the other, and has the form of a semi- 



* P. 388, f. 501. 



t Abh. d. naturforsch. Gesellschaft zu Halle, 1855, vol. ii. pp. 191-200, 

 pi. 10. 



$ P. 672. § P. 678. || P. 2, fc. i. f. 1. 



•f[ " On some Permian Fossils," Quart. Journ. Geol. Soc. xiii. p. 213. 



** "Description of a New Crustacean (Pygocephalus Cooperi, Huxley) from the 

 Coal-measures," Quart. Journ. Geol. Soc. xiii. p. 363, pi. 13. tt P. 369. 



