140 Scientific Intelligence. 
is a tradition that it was introduced into the pool by Mr. Nuttall. Last 
year Mr Edward Tatnall, an intelligent botanist and horticulturist, de- 
give it a good claim to be regarded as indigenous. So Potamogeton 
crispus must be restored to our flora. If really indigenous it probably 
occurs in other stations. Its early flowering and fruiting, compared with 
the other species (viz., blossoming in May) may have led to its being 
overlooked; but the species is probably local in this country. It is, 
however, s orous and so difficult of eradication where it is established, 
so likely therefore to hold its own or to extend, that, if not detected else- 
where, we may believe that it was recently imported into this country, 
as another water-weed, the Anacharis of North America, was into 
land, where it has spread prodigiously with a few years. A. G 
5. Marsilea quadrifolia, L.—Aquatic plants, especially those of low 
type, are in general so widely diffused geographically, that the absence 
from North America of the above named plant,—so common throughout 
the northern part of the Old World,—has always seemed rather excep- 
tional. é have now to announce its actual occurrence here. It bas 
just been discovered on the muddy borders of a pond in Litchfield, Con- 
necticut, by Dr. Timothy F. Allen. This adds another instance of the ap- 
country, but now on the verge of extinction from this flora,p—a vie 
6. Catalogue of the Acunthopterygian Fishes in the collection of the 
British Museum ; by Dr. A. Gu . 524, London, 1859 
known to hi 
been consulted these errors would not have occu o* 
re regarded as identical which have no close relationship to each othet, 
as Pomotis falax, B. and §S. P. rubricanda Store n man 
, and P, her 
points Dr. Gunther differs from the best Ichthyologists who have hith- 
erto treated of the order. Thirteen genera and forty species are @@ — 
scribed as new, W. & 
