TRANSACTIONS OP THE SECTIONS. 
75 
Ifcfflilt authors, the writer is induced to reduce them to two;—Ist, Nebalia lipes, 
(krrJijjfs, Fabricius and Herbat; Monoculua roatratiia. Montagu; Nebaha 
Iffki'i, Leach. 2 nd, A^ckiia ffeo/royi.M. Edwards; NehaliaStrausi,B.\i&o. With 
K^\otiiiiCkiroeephaIua of Prevost, it appears evident that the genus Brancht])us, 
■ wipnally described by Schaffer, and minutely figured by him in all its details, is 
piKliutmct from the species found in England, and described by authors under 
fiKoune. The differences are so great aud well-marked, that it is necessary to 
Riff them to the genus Chirntephalus of Prevost, so beautifully figured at the end of 
Juioe’s work on the Monocidi of Geneva. 
Birds observed in the Years 184C and 1847 near Llanrwstf Deft" 
litgkshWc, North Wales. By John Blackwall, F.L.S. 
Birds. 1 
Appeared. 
DUoppmed. 
Sim Martin. IliruiidD nmiWfl . .. 
1846. 
1846. 
Sept. 10 
» 20 
Bkek-esj), £iy/('ia atricapilla . 
iwd Rsiil, Galliiiulii fTfx .... 
Oct. 1 
HotWP Mnrtlfi, ffiv-sin/Jn urhi/'/t 
„ 7 
SxsUow, Hirvndo ruatica . 
„ 11 
iWwitts. TS/rilvs iUfu^it . 
Ort 4 
1847. 
March 23 
J^oodcock, Scolopax rusticola . 
ilotuitaia Fincbi Prin^illo niontifringilldtaa ««.•«•••• 
„ 5 
26 
„ 30 
' Mdfare, Thrf/ittpr/nftV.. .. . . 
.. 26 
April 17 
Wagtail, ilfofoa7/o alba . 
1847. 
IVTnrrb 9,9. 
April 4 
12 
.. 18 
kmrmm Sandpiper, Totamia kypoleucos . 
, "Mat-ear. Sairimln minniht . 
1 ^tOow Wrt*Q. Sylifift ii*rt/'hilu9 . 
.. 19 
1 llW Pipit, jJji/Aiw nrhurmin . 
.. 22 
, *kfk.cap, Sylvia atricapilla .... 
„ 26 
' ^koo, CueuluK pnnnniii . 
>7 
26 
; **sllnw, Ilirundfi rutUrn . 
.. 28 
*fktu-t, Sylvia plianimna . ... 
„ 28 
' Wren, Sylvia aibilalm . 
May 2 
.. 4 
J^**dat, Sflxico/rt . . .. 
Plycatchcr. ifHxrirnnn /»><>/iiri«rt ........... 
„ 4 
^ Bail. GaWfowfo . . 
|l 
.. 4 
Martin, JJirunda vrbica . 
99 
.. 5 
'‘tutMhroat, Sykia . . 
99 
6 
Cypse/ia mtirvirTu« ... _ 
99 
.. 7 
Sv/efo AorTwii/* .. .. 
Iff • 
12 
He Warbler. Sylvia |»Araymt/« . 
,» 14 
1 ?*?^ HVeatcher. nrSiuiln . 
.. 15 
^•tacked Shrike. iMaiu* ntllurin . . . 
II 
15 
'^^UCkcr, Cffpnnu/r^ui pump/pna ... ... 
19 
Oh the Families of British Lamellibranchiate Mollusca. 
By Professor E. Forbes, F.R.S. 
u r this commumcatioQ is to explain a classific 
oy rroicssor e,. roRBEs, jruv.^. 
this commumcation is to explain a classification of tte Lame i ran- 
; Conchifera, intended to be adopted by the author and Mr. Hanley m their 
work on the British MoUusca. U is an attempt to group our nabve 
» m nafcral families, founded upon the more important aud at the same time 
foous features in the organization of the animals. 'The characters of the 
we siphons and the foot, arc taken as a basis, though recognised as of 
