170 S. S. Buchnan — On Jurassic Ammonites. 



The mineral recalls in some respects tliat described by Kikuchi ^ 

 from the Waterase-gawa district in Japan ; but it is not possible to 

 make out in the Caldew occurrence all the interesting peculiarities 

 exhibited b}'' the much larger, fresher, and more perfect crystals 

 studied by that author. He regards the variety which he describes 

 as bearing the same relation to cordierite that chiastolite does to 

 andalusite. 



After Mr. Hutchings'' discovery, it seems probable that cordierite 

 ■will be found, if looked for, in other tracts of metamorphosed slates 

 in this country. 



YI. — Jurassic Ammonites : Notes on a Pamphlet by Dr. 



Emle Haxjg.^ 



By S. S. BucKMAN, F.G.S. 



IN the twentieth volume of the Bulletin de la Societe geologique 

 de France (p. 277) a valuable paper with the above title was 

 published. It contains three plates with a number of species, six 

 of which are said to be new. That I cannot agree with all his 

 conclusions Dr. Haug knows well, for, before the work appeared, 

 the author kindly sent me copies of his proof plates for my opinion, 

 and several letters passed between us on the subject; that he cannot 

 agree with all my opinions on matters palEeontological the author 

 readily confesses in the present paper. Nevertheless in two cases 

 of importance this paper does bring us more closely into agreement, 

 as I will point out presently. 



In plate viii., the first of the three plates which illustrate the 

 work, figs. 1 and 2 are called " Sonninia, cf. corrugata, Sowerby," 

 figs. 3 and 4, " S. furticarinata, Quenstedt," fig. 5, " S. pinguis, 

 Eoemer," fig. 6, S. (Poecilomorphns) Schlnmhergeri, n. sp." I 

 certainly do not agree with placing figs. 3 and 4 in the same 

 species : the latter figure shows a more coarsely-ornamented shell, 

 its peripherjr furnished with a large hollow carina not bordered by 

 anything like sulci, while the periphery of fig. 3 is very distinctly 

 so marked. With fig. 4 I should associate, not necessarily as the 

 same species, but as something very near, figs. 1 and 2 ; and I 

 should also place in proximity fig. 5, " Sonn. pinguis.''' Eoemer is 

 the author of the name pinguis, and, though he gave a very bad 

 figure of his shell, I think Haug's fossil is far too strongly costate ; 

 my cabinet can show specimens much nearer the original. 



Of fossils nearly, if not quite, the same as fig. 3 I have several, 

 and can say that, with age, they do not lose their peripheral furrows, 

 that they do not become strongly lobate like fig. 4, and that they 

 are certainly thinner. 



Plate ix. shows " Sonn. sulcata, (S. Buckm.) ; " in removing this 

 species from Lillia I think Dr. Haug has rightly corrected me, 

 though the form he figures differs in certain points from mine — 



' On Cordierite as a contact-mineral, Journ. Coll. Sci. Imp. Univ. Japan 

 (Tokyo), Tol. iii. (1890), pp. 313-334, pi. xxviii. 

 2 Etudes sur les Ammonites des Etages moyens du Systeme jurassique. 



