HARDWICKE'S SCIENCE-GOSSIP. 



5 



Lizard, and attributes this to want of lime. But in 

 this he is not strictly accurate, as Liminva truncatula 

 has been recorded from the Lizard, and Helix revclata 

 is found there. The last, however, is a thin-shelled 

 form, and its existence is quite in harmony with 

 Professor Bell's theory. 



Helix hortensis : var. littea ooo( 45 ), Torquay (L. M. 

 Cockerell) ; var. lutca 02343, Truro (J. H. James). 

 The band-varieties of this species are not nearly so 

 numerous as those of H. nemoralis. Var. d-breauxia, 

 Locard, occurs at Ospringe, Kent (Fairbrass) ; var. 

 michaudia, Locard, is also found at Ospringe. 



Helix arbustorum. — There is some confusion about 

 the varieties pallida and cincta of this species. The 

 original name for the pale one-banded form was 

 pallida, but this was withdrawn and cincta substituted 

 on the grounds that Westerlund had previously 

 named a different var. pallida. But it appears now 

 that Westerlund's so-called "pallida" was part of 

 a short Latin description of an unnamed variety, so 

 that cincta is not needed for our form, and falls as a 

 synonym. 



Helix cantianaformis, Ancey. — Mr. Ancey still 

 considers this species, described from Kent, a valid 

 one, and I believe M. Bourguignat is of the same 

 opinion. But it can hardly be more than a variety of 

 some known species, at the best, although I cannot 

 at present say :where it ought to be placed. Do 

 any of the Kentish conchologists know anything 

 about it ? 



Helix cartusiana. — This species is abundant about 

 Sandwich, but seems to have its northern limit on the 

 south bank of the river Stour ; it is interesting to see 

 how even a small river may thus prevent the spread 

 of a species. H. cartusiana was known from Sand- 

 wich, at least, as far back as i860, when it was re- 

 corded from there by S. P. Woodward (" Recreative 

 Science," p. 39). 



Helix (Cochlicella) acuta. — British authors, following 

 Jeffreys and others, continue to place this snail in 

 Buli mus, although it is most clearly a Helix. I should 

 think a little study of the continental forms allied to 

 Helix virgata would convince the most sceptical of 

 this. Helix conoidea, Drap., figured in Science- 

 Gossip, 1887, p. 177, Fig. 94, is one of the multitude 

 of forms intermediate between H. acuta and the virgata 

 type of shell. 



I have not sufficient material at hand to treat of 

 the variation of H. virgata, H.pisana, and H caperata. 

 These three species are much in need of attention, 

 and their variation and exact relationship with the 

 multitude of continental described species offers a 

 wide field for work. 



Clausilia rolphii, var. pellucida, Taylor, can hardly 

 keep a place on our lists, as apparently no one knows 

 exactly what it is. It may be var. albina, Schm. 



Dr. V. Sterki (Proc. U.S. Nat. Museum, 1888) 

 has remarked on the extreme constancy in the position 

 of the lamellae or teeth in the apertures of the shells 



of the genus Vertigo. This observation may be made 

 to include perhaps all the Helicidse, the correspon- 

 dence in the position of the teeth being perhaps at 

 least as marked as that in the position of the bands. 

 In Fart IV., p. 177, are figures illustrating this. It 

 will be seen that //. caipenteriana, Bid., from Florida, 

 has exactly the same kind of lamella as H. erronea, 

 from India ; while two of the teeth of the South 

 American H. bourcieri correspond with the only two 

 of the Philippine H. moricandi. 



On the same page (Fig. 97) is a figure of Clausilia 

 biplicata monst. tridentatum ; this was taken near 

 Hammersmith, but on the Surrey side of the river. 

 The teeth in the figure are exaggerated greatly be- 

 yond their natural size unfortunately. Fig. 98, fol- 

 lowing that of the Clausilia, shows very well the 

 constriction of the valve which is so frequently seen 

 in the fossil examples of Pisidium and Spliarium from 

 Crayford. Why a character apparently monstral 

 should occur so commonly among these shells, is more 

 than I can tell. May it have been due to the effect of 

 some parasite in retarding shell-formation at that 

 particular point ? 



The varieties of Unio pictorum found about London 

 deserve study. Some of them may be found to cor- 

 respond with Drouet's Unio subtilis. 



Physa hypnorum, var. intermedia, I have recorded 

 from Cumberland (Smith), in the "Naturalist" for 

 October. I omitted to state that I have also seen 

 Physa fontinalis, var. rufula, Locard, from the same 

 county, the exact locality being in both cases unknown 

 to me. Both these varieties are new for Britain, and 

 two others may also be added to the British list, 

 namely Succinea pfeifferi, var. pallida, Moq., Leckwith, 

 near Cardiff (Wotton), and Linuuea peregra, var. 

 globulosa, Locard, from Enfield, Middlesex (Fryer). 

 I have seen examples of Vertigo pygmcea, var. rubella, 

 Locard, which I believe were collected in Yorkshire, 

 but this is somewhat doubtful. 



Limncea peregra, var. boissii, Dup., I have seen 

 from Tarleton ; and var. solemia, Zgt., from Southport. 

 I believe these have already been recorded. 



Colorado. 



NATURAL HISTORY JOTTINGS. 



On the Leaf-Stalk Glands of the Common 

 guelder-rose and wlld cherry : and the 

 Relations of Insects thereto. 



SIR JOHN LUBBOCK, in a paper "On the 

 Leaves of Guelder-Roses," read before the 

 British Association in the Biology Section on Friday, 

 September 13th, at Newcastle-on-Tyne, as reported in 

 the "Newcastle Daily Chronicle" of the day following, 

 gives some interesting and instructive information 

 with respect to the form and vernation of the leaf 

 of the common Guelder-rose ( Viburnum Opulits) ; 

 but no mention is made of his having made any 



