Pvn H,i I'UitlS

438 MACTRID.E.
published at Copenhagen in 1798, has removed all doubt
from my mind. It contains a full description of the
species in question, which was communicated by M tiller
to his friend Fabricius and I now ; give it with all faults.
"
Mya nitida. Long. 6. Lat. 3 lin. Testa extus in-
tusque glaberrima, pellucida, lsevis, nitida, absque striis
Candida, unicolor, subelliptica. Dens depressus obscu-
rior, quasi antrorsum nexus in quovis cardine. Tellinam
prima facie revocat, at testa hiat, nee dentes tres,
nee alterum latus flexa est. In sinubus inter Christian-
sand et Arendal raro." The true teeth appear to have
escaped Miiller's observation ; and no wonder, for they
are exceedingly minute : what he called
' '
the
must be the cartilage-pit.
The Mya
dens "
nitida of Fabricius
is Lyonsia Norvegica • and it was in order to show the
difference between his and Miiller's shells of the same
name that he introduced the description quoted above.
I examined authentic specimens of Muller's Mya nitida
in the collection of Fabricius at Copenhagen, and they
are decidedly the present species. Loven described it
as Syndosmya nitida. It appears to be the Scrobicu-
laria tenuis of Philippi, a Panormitan fossil.
3. S. al'ba*, Wood.
Macura alba, Wood, in Linn. Trans, vi. p. 165, t. xvi. f. 9-12. Syndosmya
alba, F. & H. i. p. 316, pi.
xvii. f. 12-14.
Body whitish, with a pale tint of sky-blue interspersed with
flake-white spots : mantle thickened at its edges and fringed
with very small whitish papillae (according to Bouchard-
Chantereaux these papillae are arranged in three rows) : tubes
cylindrical, elastic in respect of both length and width ;
when
fully extended they are as long as the shell is broad, and
sometimes distended to three times their usual diameter ; each
is covered with a light-brown epidermis, and when half cx-
* White.