THE TERTIARY DEPOSITS OF BRAZIL. 87 
which may be due.to their habit of life. To refer them to any British 
species would lead to error, for the want of better evidence and 
knowledge of the animal. 
Loc. Canama, 
Frenetta, Adams. 
Only one specimen of this genus (fam. Rissoide) appears amongst 
the small shells in the collection ; no specific name can be appended. 
Shell small, elongated, composed of seven whorls, those of the 
spire having two concentric lines near the base of each whorl, the 
body-whorl possessing three or four; aperture elongated; columella 
thick. Length 53, inch. 
Loc. Canama, 
CrRITHIUM coronatuM, Ether. (PI. VII. fig. 5.) 
Shell elongated; whorls ten, the first six or seven smooth, or 
nearly so, the remaining whorls ornamented with tubercles and 
coarse lines; tubercles arranged in a single row along the shoulder 
of cach whorl below the sutural line; outer lip notched close to the 
shoulder of the whorl and suture in a line with the line of nodes or 
tubercles ; inner or columellar lip reflected ; base of the body-whorl 
with four or five strongly marked concentric lines and a few fainter 
ones near the anterior canal, and crossed by fine lines of growth. 
Loc. Canama. 
Metanorsis? Brown, Ether. (Pl. VII. fig. 4.) 
There are some eight or ten specimens of this species; but I have 
nothing to compare them with. The genus is represented by a large 
number of species distributed world-wide; it apparently, with the 
other molluscan remains of the Amazon valley, was estuarine in 
habit. 
Spec. char.—Shell turreted, elongated ; whorls five, sides vertical ; 
sulcus or suture at junction of the whorls depressed, the sutural edge 
elevated ; upper whorls doubly carinated ; body-whorl concentrically 
banded by nearly equidistant lines, slightly rugose at the base, here 
and there possessing a varice; anterior canal slightly notched; outer 
lip toothed ; columellar lip slightly reflected and thick. 
This shell much resembles a Melania, and but for the siphonal 
notch might be referred to that genus or its subgenus Plotia. 
Loc. Canama. 
Mrnanra TRICARINATA, Ether. (Pl. VII. fig. 6.) 
Shell small, elongated; whorls nine, ventricose, bevelled, and 
deeply constricted on the upper part or shoulder of each whorl; 
three carinee, or distinct lines, occur on all the whorls except the last 
or body-whorl, which possesses four; aperture ovate; anterior canal 
short, very slightly notched. Length 4 inch. 
Loc, Canama. 
