Correspondence — Dr. H. Woodward — Mr. J. E. Marr. 567 



COERESPOITDEUCE. 



CALAIS NEWBOLBI. 

 Sir, — Since the publication of ray paper " On a Fossil Octopus 

 (Calais Newboldi, J. de O Sby. MS.), from the Cretaceous of the 

 Lebanon," in the Quart. Journ. Geol. Soc, vol. Hi, p. 229, 1896, 

 I find that the name Calais has been twice used — first by F. L. de 

 Laporte in 1836 (Silberinann, Revue Entomologiqne, vol. iv, p. 9) 

 for a genus of Coleoptera ; secondly by J. A. Boisduval, also in 

 1836 ("J. A. Boisduval, Species General des Lepidopteres," vol. i, 

 p. 584; quoted as a synonym of Idmais, Boisd.). Under these 

 circumstances it becomes needful to propose a new generic name for 

 Sowerby's Calais ; I would therefore suggest that the name of 

 Palceoctopus replace that of Calais, which is preoccupied by a genus 

 of Coleoptera. Henry Woodward. 



LIFE-ZONES IN CARBONIFEROUS ROCKS : A CORRECTION. 



Sir, — I observe that in your last number (p. 519), the British 

 Association Report on Life-zones in the British Carboniferous Rocks 

 is stated to have been drawn up by me, whereas it was the work of 

 the Secretary, Mr. E. J. Garwood. John E. Marr. 



70, Huntingdon Road, Cambridge. 



LINiNLEUS ON THE APPENDAGES OF TRILOBITES. 



Sir, — In the May number of the American Geologist, Dr. C. E. 

 Beecher has published an article entitled "On a Supposed Discovery 

 of the Antennae of Trilobites by Linnaeus in 1759." As this article 

 refers to my short communication to the Geological Magazine, 

 p. 142, March, 1896, I shall be glad if you will afford some space 

 for a few remarks in reply to the interpretation of Linne's figure 

 proposed by Beecher. 



To begin with, I regret that, in the introductory words, I have 

 used so inaccurate an expression as to suggest that Linne's paper 

 had been overlooked ever since its first appearance, while I have 

 only taken into consideration the period which I have spoken 

 of as a time of important researches into the ventral structure 

 of Trilobites. 



Beecher sums up his reasoning concerning the organs, regarded by 

 Linne as antennae, in the following terms : " It necessarily follows 

 that the cephalon of the specimen figured by Linnaeus is without 

 free cheeks, and with this interpretation of the figure, the supposed 

 antennae can only be homologized with the thickened border 

 between the points where the facial suture cuts the anterior 

 margin." This conclusion is drawn under the supposition that 

 the disputed organs are not antennae, but no conclusive evidences 

 are adduced that they are not. Before entering upon an examination 

 of Beecher's arguments, I think it suitable to give a short review of 

 the modes in which the head of Parabolina spinulosa, Whalb., is 



