Correspondence — Mr. C. Lapioorth. 189 



Ceratopyge Limestone are a distinct equivalent of the English 

 Skiddaw, 



Conophrys can hardly be separated from the Shumardia of Billings 

 (Pal. Foss. Canada, vol. i. p. 92), which occupies a somewhat 

 similar, perhaps a little higher horizon. To the same genus pro- 

 babiy also belongs the Battus pusiJlus of Sars (Isis, 1835. p. 334, 

 t. viii. fig. 2=Agnostus or Oleniis pusilhis, Kjerulf), which occurs near 

 Christiania together with Ceratopyge forficula. 



As to Lichapyge, it cannot have any affinity to Paradoxides, and 

 hardly to Liclias. I little doubt that it is most nearly allied to 

 Bemopleurides, if not a true Bemopleurides. In some species of 

 Bemopleurides, as B. dorsospinifer, Portl., it is very usual to find the 

 pygidium united with the two hindmost thoracal segments. The 

 fossil described as Lichapyge would have almost the same shape, if 

 the terminal limb had two denticles on either side. 



The subgenus Platypeltis seems to be more nearly related to 

 Niobe than to the genuine Asaphi. Also Niobe is characterized by 

 not having the hypostoma forked. G. Linnaksson. 



Geol. Survey Office, Stockholm, March ith, 1878. 



GEOLOGICAL MAP OF SCOTLAND. 



Sir, — Since the publication of my review of Prof. Geikie's Geo- 

 logical Map of Scotland, it has come to my knowledge that the vast 

 mass of new detail inserted thereupon in the areas south of the 

 Grampians, instead of being due to a digest of Survey work, is in truth 

 the result of the author's recent personal investigations. The map 

 has been the constant occupation of his leisure hours for many years, 

 his summer holidays being generally given up to journeys for its 

 extension, and improvement. Even the remarkably minute mapping 

 of the Old Eed and Volcanic series of Fife and Forfar, the trappean 

 belt of the Solway, etc., noted by us for especial commendation, 

 was completed by himself before the Survey moved into those dis- 

 tricts. Though this deprives the map of anything like an official 

 character, it adds much to its general reliability. It is indeed highly 

 satisfactory to feel assured that all the new work is by the same 

 hand, and that consequently the details throughout are as trustworthy 

 as those within the areas already covered by the Survey. Looked 

 upon as the simple product of individual original research, the map 

 is a monument of rare geologic skill and energy. The author is to 

 be congratulated on having, single-handed, accomplished his task 

 with a perfection and completeness that — however widely views 

 may differ as to the expediency of his new systematic arrangements 

 — has charmed all those whose opinion is worthy of a moment's con- 

 sideration. Chas. Lapwoeth. 

 St. Andrews, March 20th. 



DR. CAEL MAYER ON THE ITALIAN TERTIARIES. 

 Sir, — In the last number of the " Bolletino del E. Comitate 

 -Geologico d'ltalia" there are again several important papers on the 

 Italian Tertiaries, but that of Dr. Carl Mayer calls for special atten- 



