I 
THE NAUTILUS. a 
earlier, it is likely that Prof. Dall recognized the form after the 
publication of the nude name in Man. Conch., but before it was 
scantily clothed with a description in the October NaurTiILus. 
Dall’s first notice of the form referred merely to Binney’s figures ; 
but lately he has given an account of it which leaves nothing to be 
desired save an equally good notice of the soft anatomy. 
NEW UNIOS. 
BY BERLIN H. WRIGHT. 
Unio Buxtoni sp. nov. 
Shell very transverse or wide, subcylindrical, moderately and 
uniformly inflated, subsolid, bluntly pointed and attenuated behind, 
obliquely rounded in front and straight on the dorsum. Epidermis 
olive-black and obscurely rayed throughout. Growth lines obscure. 
Umbos depressed. Beaks pointed and very small, with two or three 
distant, nodose undulations. Umbonal ridge rounded or subangular. 
Beak cavities slight; cavity of valves ample. Lateral teeth 
straight, slender, thin and long, the inner one thicker and higher, 
and both extending to the cardinals, which are erect, short, with 
many curved ridgelets on the upper faces, double in the left and 
single in the right valves. Cicatrices slightly impressed but well 
defined, the anterior ones distinct, the smaller ones being crescent- 
shaped, which divides occasionally into two separate pits; posterior 
ones confluent and much elongated ; dorsal ones well impressed and 
in the beak cavity. Pallial line distinet, at which the coruscations 
end. Nacre uniform and of a brilliant copper tint. Width 23 
inches, length ? inch, diameter 2 inch. 
Habitat.—Lakelets of Marion Co., Florida. 
Type in National Museum. 
Remarks.—A ffinity, U. Waltoni B.H. Wright, and U. nasutulus 
Lea. From the former it differs in being smaller, more solid, cylin- 
‘drical, darker colored, more prominent umbonal ridge, not sub- 
emarginate at base, and in having a more prolonged dorsal line be- 
hind. Behind, and in size and structure, it reminds one of U. nasu- 
tulus, which never has an upturned keel in frout as in our shell, and 
has a livid nacre. 
We have great pleasure in naming this species for our good friend 
and naturalist, Mr. William W. Buxton, of Milo Centre, N. Y., 
whose company has so often enlivened our collecting excursions. 
