284 Correspondence — W. D. Lang. 



nodules, whicli lie in bands in a yellow clay about 30 or 40 feet below 

 the Top Hard Coal. 



The East Kent insect-remains occur in core shales, the horizon of 

 which is not yet determined. 



The win^s obtained by Dr. Moysey are not referable to any known 

 families. Three new families are formed to contain them, one of 

 which is nearly related to the Lictyoneuridae with some suggestion of 

 the family Heliolidae. A second new family is allied to the Heliolidae, 

 and the third new family to the Homoiopteridse, or, as the writer 

 believes, near to the Lithomantidse. 



The East Kent insect-remains contain one wing, referable to the 

 genus Sooniylacris {EUohlattina), a species of which is already known 

 from the Forest of Dean Coal-field. 



The finding of two species of the same genus in coal-fields so widely 

 separated as those of the Forest of Dean and East Kent is not without 

 interest, in view of the generally accepted belief in the former con- 

 tinuity of the Coal-measures across the South of England. 



C O I^IiE SIP O 3Sr ID E Dsr C E . 



THE USE OF THE TERM ' CHARMOUTHIAN '. 



Sir, — In the May number of the Gteological Magazine for this 

 vear, on p. 232, the reviewer of Jukes- Browne's Studenta'' Handbook 

 of Stratigraphical Geology says : " The term Charmouthian for part of 

 the Lias (pp. 383, 387) is used for the Middle Lias zones of the 

 Ammonite genera Paltopleuroceras sphiattim and Amaliheus margaritatiis, 

 whereas on p. 405 the term is taken to include also the Lower Lias 

 zones of capricortms and armafus. This is unfortunate and no 

 improvement. As a matter of fad [italics mine] the term is inappropriate 

 as no Middle Lias (as above defined) occurs in the cliffs at Charmouth. 

 If used at all the term should be applied to the Lower Lias clays 

 (zones oltusus to caprivornus) .^' 



Surely, if used at all, the term should be applied to the beds 

 included in the Cliarmouthian by the author of the term. This, 

 according to Ilenevier,^ was Mayer-Eymar, who proposed the term in 

 1864^ and included within it the same beds as Oppel included in his 

 Pliensbachian in 1858 ^ and d'Orbigny iu his Liasian in 1852,* 

 namely, the zone of Deroceras armatum to that of Paltopletiroceras 

 spinatum inclusive. Since these zones occur in the neighbourhood of 

 Charmouth, I see no objection to applying the term with its original 

 connotation, as Jukes-Browne appears to have applied it. 



By the "Middle Lias (as above defined) " the reviewer presumably 

 means the margaritatus and spinatus zones. To say that, as a matter 



^ Eenevier, " Chronograpbe Geologique " : Congres Geologique international, 

 Compte-rendu de la sixieme session, 1897, p. 572. 



" Mayer-Eymar, "Tableau synchronistique des Terrains Jurassiques," 1864. 

 I have not verified this reference. 



^ Oppel, Die Juraformation Englands, Frankreichs, und des Siidwestlichen 

 Deutschlands, (1856 )1858, p. 815. 



■* D'Orbigny, Cours iUmentaire de Paleontologie et de Geologie strati- 

 graphiques, vol. ii, p. 448, 1852. 



