ON BRACHIOPODA. 491 
In the anterior cavity are two orifices placed symmetrically 
at the lower face of the upper lobe, in front of the mouth, and — 
even of the tentacula. These two orifices appear similar, 
one at the right, and the other at the left of a medial canal. 
It seems not improbable that they are the termination of the 
organs of generation. : 
In the visceral cavity, on each side, externally to a granular 
mass, which occupies all the interval of the muscles, is seen 
from the point of the shell to the termination of the external 
pair of muscles, a gelatinous body, pretty large, and thick. 
This, in all probability, constitutes the ovaria. Another organ, 
much smaller, is placed at the right side, and formed by kinds 
of little leaves, joined by a common and longitudinal pedicle. 
This may or may not belong to the generative system. 
The rest of the visceral cavity is filled by a mass subdivided 
into two, and as if composed of grains, which very probably 
is the liver, and at one of the sides of which is a part of the 
intestinal canal, which may be the rectum. 
The heart seems to be placed at the middle of the anterior 
part of the anterior visceral mass immediately behind the 
middle pair of muscles. 
This description of the anatomy of the lingula is taken 
from M. de Blainville. The Baron’s view of its anatomy 
differs in some points; but it is proper to observe that the 
animal is but imperfectly known. There is but a single 
species, which comes from the Indian Ocean, near the 
Molucca Islands. 
The TEREBRATULZ constitute a genus of mollusca, esta- 
blished, and perfectly defined by Linnzus, under the name 
of Anomia, but into which many unsuitable species were in- 
troduced. The shell may be considered horizontal. The 
valves are equilateral, but the under one is always the smallest. 
The upper is generally more gibbous, and its constant cha- 
racter is to have its top more or less elongated into a sort of 
