Correspondence — Mr. S. V. Wood — Mr. W. Davies. 335 



PHYSICAL GEOLOGY OF THE PUNJAB. 



Sir, — Will you allow me to make a few corrections in your 

 abstract of my short paper to the G-eological Society (Geol. Mag. 

 Dec. II. Vol. v., No. IV., April, 1878, p. 181.) 



Line 1 /or "accession" re««f" accessible." 

 ,, 12 for " on limestones " read " are limestones." 

 ,, 14 for " Lei Ban " read " Sirban." 

 ,, 26 between when and present insert " both are." 

 „ 28 for " further east a " read " further east, in the Salt Eange a." 



A. B. Wynne. 



SUBGLACIAL ORIGIN OP TILL. 



Sir, — Mr. Geikie writes you that " I quietly ignore all the posi- 

 tive evidence " which has been adduced in proof of the subglacier 

 origin and accumulation of the chalky Till of Suffolk." 



I know of no such positive evidence. 



Per contra. Why does Mr. Geikie so quietly ignore the positive 

 evidence of marine conditions afforded by the thread of sand, packed 

 with the remains of marine mollusca with valves adherent, which 

 was discovered by Prof. T. M. Hughes and Mr. L. Lyell in the 

 midst of the chalky basement clay of Holderness, which is similar 

 in character and structure to the chalky clay of Suffolk ? 



S. V. Wood, Jun. 



ERRATUM. 



Sir, — Not having had the opportunity of examining the drawings 

 of Plate VIII., in the June Number, before the stone was etched, 

 allow me to call attention to some points in which they are defec- 

 tive. In Fig. 1 the oblique foraminal notches are not defined, 

 these are an important character, and are clearly shown upon the 

 fossil ; again, Fig. 2 does not give the entire outline of the mandibu- 

 lar ramus, which is well represented upon one of the blocks, inas- 

 much as the artist has omitted in his drawing the imperfect angular 

 and articular bones preserved upon it, and it is consequently half an 

 inch too short. The enamel of the teeth is finely plicated on the 

 cutting edges, but the teeth are not crenulated, as the drawing of 

 the plications on the enlarged Figure 2 h might suggest. Finally, 

 in " Explanation of Plate," Fig. 2&, for inner read antero-posterior. 



Wm. Davies. 



Erratum. — ^We are are requested to make the following correction 

 of the notice of Prof. M'Coy's "Victorian Organic Eemains" (Decade 

 V.) given in the June Number, see p. 284, lines 5 and 6 from top: — 



Substitute for " whether the supposed Mesozoic genus Beletnnites may," etc., 

 " whether the Mesozoic genus Belemnitts supposed to occur in the Australian 

 Tertiaries may," etc. 



