355 



NOTES on MOLLUSCA. 



Helix aspersa var. exalbida at Hubbard's Hill, Louth. -On 



Saturday, 31st August, I found a living example of H. aspersa v. exalbida 

 on the grassy slope of Hubbard's Hill, near the road. On the following 

 Friday I found a specimen in the wood approaching v. exalbida. Then- 

 was a faint colouring on the inside of the shell, and the animal was rather 

 dark grey. The animal in the other case was yellowish. This, together 

 with a specimen of Helix ne in oral is v. albina, which I found in the wood in 

 June, are additions to my list of ' Albinism in Mollusca at Hubbard's Hills,' 

 Nat., May 1901, p. 157.-- C. S. Cartkr, Hon. Curator Louth Ant. and Nat. 

 Soc, 172, Eastgate, Louth, Lines.. 10th September 1901: 



Note on Breeding Limnaea peregra monst. sinistrorsum. During 

 May of the present year, being in possession of a few living specimens of 

 the reversed form of Limncea peregra (see my note in ' Naturalist,' July 1901, 

 p. 216), I thought it might be interesting to keep them alive, at any rate 

 until they spawned, to ascertain to what extent (if any) the laws of heredity 

 played a part in the reproduction of these malformations. Of course the ex- 

 periment was very incomplete, as I have no evidence that the other parent 

 was sinistral or dextral. The one thing I am clear about is that all the spawn 

 in my aquarium was deposited by the reversed or sinistral form, so that 

 undoubtedly one parent was malformed. In due time the spawn was 

 hatched, the dextral and sinistral being mixed from the same egg masses, 

 the latter being extremely scarce in comparison with the former.— Wm. 

 Nklson, Crossgates, 24th August 1901. 



Habits of the Fry of Limnasa stagnalis. — Keeping an aquarium for 

 the purpose of rearing and observing the fry of different species of 

 Limnaeidse, I have furnished it with various aquatic plants, amongst which 

 is the Frogbit (Hydrocharis mqrsus-rance). Of late I have been much 

 interested in watching the habits of the fry of Linnuea stagtialis, bred from 

 specimens I had taken in North Leeds ; they had only been hatched some 

 three or four days, and measured 3 mill. They crawled persistently out 

 of the water on to the upper surface of the leaves of the Frogbit. Is this 

 habit inherited from some remote ancestor? So far as my experience goes 

 it is by no means a permanent one, but seems to be exercised only during 

 its young stage, for when it reaches a more mature age it becomes more 

 partial to floating on the under surface of the water than of crawling out of 

 it. — \Y.\I. NKLSON, Crossgates, 24th August 1901. 



Limax cinereo-niger near Brigg, Line. N. Li max cinereo-niger Wolf, 

 has been recorded for Line. N., but I never took it till 30th September 1901. 

 At 9 p.m. I visited the water tubs at the east end of my house in the hope of 

 taking L. maximus , and found one L. cinereo-niger on the gravel, and ten 

 minutes later one in the western tub. They were both almost black except 

 along the dorsal keel, with footsole and respiratory orifice very characteristic. 

 I should have called them the variety orhata if the two rows of white spots 

 had been more distinct. The shell of the larger specimen, which, when 

 extended was 6-}{ inches long, is .11: of an inch long and J.t broad. I have 

 known what L. maximus is like for over 30 years, and for some Time was 

 greatly puzzled to know what I had taken, but there was no mistaking 

 it when I looked up and followed its specific characters. — E. Adrian 

 Woodruffe- Peacock, Gadney, Brigg-, 2nd October 1901, 



NOTES and NEWS. 



# 



In the recently-issued list of the Geological Society, dated 6th November, 

 the numbers of the fellows resident in the Northern Counties are as follows : 

 Yorkshire 69, Lancashire 58, Cheshire 24, Durham 1S, Northumberland 17, 

 Derbyshire 14, Nottinghamshire 1 _\ Lincolnshire 5, Cumberland 4, West- 

 morland 3, Isle of Man o. 



1901 December 



