142 Correspondence — Her. E. Hil! — Br. S. L. Tornquisf. 

 C O IR, IR IE S IE 3 O ILT ID IE ILsT C IE- 

 HEIGHTS OF CHALK. 



g IRi — I am glad that Mr. Lam pi ugh has corrected me as to the 

 greatest height of the northern Chalk. Garrowhy Hill seems to lie 

 near the edge of the elevated area ; in going over the sheets of the 

 Ordnance Map I had not noticed its exceptional height; I have 

 never been in that part of the district. 



Besides this correction another has to be made. I wrote : "Mr. 

 Deeley tells us that Chalk-drift is found in Leicestershire up to 

 800 feet." But his actual words are: 1 "At Tilton. one of the 

 highest points in East Leicestershire"; he makes no definite state- 

 ment of height. The ground at Tilton rises to 700 feet ; the figures 

 800 are a slip of my own memory. So 1 have not only made an 

 incorrect statement, but made Mr. Deeley seem responsible for it. 



January 24th, 1896. E. HlLL. 



ON THE APPENDAGES OF TRILOBITES. 



Sir, — At the present time, when the important researches on the 

 structure of Trilobites, recorded of late years, have highly excited 

 the interest of palaeontologists upon this subject, I hope you will 

 permit me to call attention to an observation on the antennas of 

 these fossils made by Linnaeus upwards a hundred and forty 

 years ago, and, as far as I know, never referred to. In the Pro- 

 ceedings of the Swedish Academy of Science (" Svenska Vetens- 

 kaps-academiens Handlingar"), vol. xx, issued in 1759, Linnaeus 

 communicated an article entitled " Petrificatet Entomolithus para- 

 doxus, sadant, som det finnes uti Hans Excellence Riks-Radets 

 Hbgoal borne Herr Grefve C. G. Tessins Samling." A specimen 

 of ParnboUna spinulosa, Wahlenb., is there figured, tab. i, fig. 1, 

 showing one pair of antennas at their true place ; and from the 

 accompanying description it appears that the author attached due 

 importance to the presence of these organs. His words relative to 

 them (pp. 21, 22) run thus, translated into English : " Fig. 1 is 

 one of the clearest specimens I ever saw among so man}' thousands. 

 Most remarkable in this specimen are the antennas in the front, which 

 I never saw in any other example, and which clearly prove this fossil 

 to belong to the insects" (=Arthropoda). The specimen in question 

 had been found by Dr. Tidstrom, and was shown to Linnaeus, as 

 seen above, by the Count C. G. Tessin. This reference to an old 

 observation can by no means abate anything of the value of the 

 brilliant discoveries of our days, but justice demands this discovery 

 of Linnaeus to be rescued from the oblivion into which it seems to 



bave sunk - Sv. Leonk. Toknquist. 



Lund (Sweden), February, 1896. 



1 Quart. Journ. Geol. Soc, vol. xlii, p. 463. 



