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Amongst the true shellfish these localities were richer ; but if we 
except mussels and oysters which assemble, so to speak, amongst 
these rocks and waves in swarms, all the shells were univalves. In 
the bottom of the bay numerous magnificent bivalves live amongst 
the mud and sand. We will go on a future date to capture them in 
their peaceful habitations; but, not to anticipate the natural order 
of events, we will here indicate rapidly some of the more remark- 
able shells which we collected on Bernier Isle. 
Of all the species of mussel known up to the present, one which 
I discovered there is undoubtedly the most beautiful and splendid; 
deprived of its sea-coating, it reflected all the most vivid colours of 
the prism and of precious stones ; it is radiant, if I may thus express 
it. I have described it under the name of Mytilus effulgens. 
On other grounds, the oyster of this coast ( Ostrea scyphophilla, 
n. sp.) deserves particular attention; its lower valve is a kind of 
elongated cone 16 to 19 cms. long (6-7 inches), more or less regular. 
Fixed on the rock by its point and by one of its sides, it is covered 
by the second valve, which closely resembles the same piece in our 
common oysters, and which forms an operculum for the kind of 
cornet which I have just described. The animal does not occupy the 
whole depth of this curious shell; it lives in the summit of the cone, 
all whose lower portion is occupied by a large number of small 
transverse partitions like watch glasses, which reach to the ex- 
tremity of the point by which the shell is attached. Their concave 
face is turned upwards, leaving between them free spaces, which are 
filled with an aeriform fluid, whose nature it would have been in- 
teresting to determine. However curious this oyster may be, its 
animal nevertheless was extremely delicate, and all opinions agreed 
in its favour. 
Amongst the univalve shells peculiar to this part of the land of 
Endracht, I must mention a beautiful species of Trochus or Top- 
shell ( Trochus smaragdinus , n. sp.) of the most vivid and intense 
green colour; a species of Limpet which, from its proportions, I 
named Patella gigantea ; a magnificent Volute 1 (Voluta nivosa , 
n. sp.) sprinkled with little white spots like so many snow-flakes, 
and above all a cone ( Conus dorreensis, n. sp.) about 40 mm. (1 y 2 
inches) long, very light orange in colour, and distinguished by a band 
6 or 7 mms. (3 lines) broad, which is developed on each whirl of 
the spire, and which in the quite fresh shell is the most brilliant 
(blue) lapis colour. Two species of land shells extremely numerous, 
but all dead, occupied great stretches of the interior of the island, 
one was a small species of Helix, the other belonged to the genus 
Bulimus of M. de Lamarck. 
The Crustacean family does not embrace a large number of 
species on these coasts ; but there are two of the genus Portunus of 
M. Latreille (P. pi eur acanthus and P. euchromus, n. sp.), which 
1 Scaphella nivosa, Lamk. 
