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kanten upp till bucklornas topp, hvar och en upptill tvär;
bucklorna stora, uppsvälda, trubbiga, sammanstötande;
perl-morn på skalens insida blekt blåglänsande; lås- och sidotänder
mycket starka,
Förekomst. Kina, Hongkong.
Gen. Anodonta Lam.
39. Anodonta caiipygos Kob. var. humerosa nov. (Taf. 6. fig. 33.)
Differt a typo umbonibus latis, humilibus, tumidis, marginem
conchee superiorem vix prominentibus; long. 55, alt. 33, crass. 28 mm.
Förekomst. Japan, fioden" Jokogava, närä Tokio.
Tillägg.
Mr. AV. II. Dali i Washington har benäget meddelat mig
en i september-häftet för i år af Proceedings of United States
National Museum införd uppsats, »Reports on the mollusca of
the Commander Islands, Bering Sea, collected by Leonhard
Stejneger in 1882 and 1883: by W. II. Dali». Om
naturbeskaffenheten på dessa öar säger hr D : »I am informed by dr.
Stejneger’ tliat the coast of the Commander Islands, especiaily
Bering Island, is largely rocky, composed chiefly of sandstone,
which extends in rocky flats from the shore at the base level
of erosion by the waves for quite a distance seaward; from
small capes or projéetions a reef invariably extends seaward,
often of volcanic rock. The shore is tlius composed of a
succession of small bays or bights, none of which afford a
har-bour. and only one or two an anchorage even for small craft.
The beaches at the head of these bays are rocky, or composed
of shingle with an occasional strip of sand, the latter
espe-cially where streams fall into the sea. There are several lakes
at tlie northern part of Bering Island; the soil is covered witli
that moss-like coating of sphagnum, reindeer lichen, and
Em-petrum which is characteristic of those regions, with an
admixture of the usual boreal herbage, dwarf willows, Vaccinum,
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