W. C. Lucy — Drifi of Charnwood Forest. 497 



or keel seen both in the recent j^ga monophthalma (Plate XXII., 

 Fig. 7), and the fossil PaUga Gateri (Plate XXII, Figs. 3-6). We 

 prefer therefore to introduce the generic name Palcega, by which to 

 distinguish the fossil forms, than to adopt the very objectionable 

 alternative of referring to a recent genus, a doubtful and but par- 

 tially known fossil. 



Should Mr. Billings's discovery of the existence of legs in 

 AsapJius platycepTialus be found capable of general application to 

 the Trilohitcs, we have in this group the earliest representatives of the 

 Isopoda. Whilst admitting the desirability of the union of Trilohita and 

 Isopoda, it should, however, be borne in mind that between these 

 two groups important structural differences exist that cannot be 

 lightly passed over : such, for instance, as the facial suture, the 

 position of the eyes, and the trilobed character of the body-segments. 



EXPLANATION OF PLATE XXII. 

 Fig. 1. Scyllaridia Bellii, sp. nov. dorsal aspect natural size (Coll. Mus. Brit.), 

 London Clay, Sheppy. 

 2. Scyllaridia Bellii, side view of same, nat. size. 

 la. „ „ dorsal aspect (enlarged) o, o, the eyes. 



lb. „ „ ventral aspect (enlarged), m. position of maxillipeds, e. 



position of efferent orifice. 

 . 3. Balaga Garter i, sp. nov. Grey Chalk, Dover, nat. size (Coll. Mus. Brit.). 



4. ,, „ Chloritic Chalk, near Cambridge (Woodwardian Mus. Cam.) 



5, 6. „ „ Chalk Eoek, Luton, Beds. (Coll. J. Saunders, Esq , Luton). 



7. Mga monophthalma, Johnston, N. British Coast, attached to Codfish (nat, 



size). 



[In Fig. 3, the keel of the telson is not well seen, the surface of the tail segment 



being a good deal abraded, but the margin shows the mucro and the characteristic 



dentated border observable in the Cambridge specimen, Fig. 4.] 



(To he continued.) 



II, ^NOTES UPON THE OCCURRENCE OGF THE PoST-Pl,IOOENE DrIET OE 



Charnwood Forest. 

 By "W. C. Lucy, F.G.S,, Gloucester. 



DUKING the investigations I made on the " Post-Pliocene Gravels 

 of the Severn, Avon, and Evenlode, and their extension over the 

 Cotteswold Hills," the result of which I embodied in a paper read 

 before the members of th« Cotteswold Club in the early part of 

 1869, and is now published in their "Proceedings," many of the 

 boulders found by me, on examination by E. Etheridge, Esq., of 

 Jermyn Street, were determined to be syenite and granite from 

 Charnwood. 



Being naturally anxious to see the rocks m situ, from which they 

 were derived, I recently made an excursion to the Forest, taking up 

 my quarters at a central position, the picturesque village of Wood- 

 house Eaves. 



My first walk was to Mount Sorrel, and on my way I was much 

 surprised to see a good deal of flint and drift, having heard that 

 there was no distinct evidence that that part of the country had been 

 submerged since the deposition of the New Eed. After visiting the 

 quarries, under the able guidance of the manager, Mr. Hamblyn, I 



