THE ANNALS 
AND 
MAGAZINE OF NATURAL HISTORY. 
[SECOND SERIES.] 
No. 6. JUNE 1848. 
XLII . — On a proposed Neiv Order of Gasteropodous Mollusca. 
By Joshua Alder and Albany Hancock. 
[With two Plates.] 
\ 
At the last meeting of the British Association at Oxford we took 
the liberty of bringing under the notice of the Natural History 
Section two or three curious little mollusks, which had recently 
been found by our friend Mr. W. P. Cocks on the coast near 
Falmouth. These mollusks belong to a group very little known 
to British naturalists, but interesting on account of their zoolo- 
gical relations, and the modifications they show in the molluscan 
type. Want of time prevented our making our communication 
to the Oxford meeting so full as we could have wfished, but 
having since had the opportunity of making further investiga- 
tions, particularly with regard to their anatomical characters, w*e 
now offer our remarks on this group in a more detailed and 
somewhat amended form. 
The three species which we then described we considered to 
be new. On showing our di’awings to Dr. Johnston, however, he 
at once recognized our Chalidis nigricans to be his Limapontia 
nigra^ a species which we had previously not been able to make 
out. There cannot be a doubt that our little animal belongs to 
the genus Chalidis of Quatrefages ; these genera therefore must 
be synonymous ; and as the name of Limapontia has precedence, 
it becomes necessary to adopt it. The description and figure 
published by Dr. Johnston in Loudon^s ^ Magazine of Natural 
History,^ taken from a single specimen, did not give the cha- 
racters so well as could be wished ; it will, therefore, we trust not 
be thought superfluous if we redescribe and figure it on the pre- 
sent occasion, especially as this is the species upon which our ana- 
tomical details are founded. 
Ann. ^ Mag. N, Hist. Ser. 2. Vol. i. 
27 
