: 
: 
; 
a 
3 
a 
A jihad a i ce rs 
_ and allied Brachiopod genera. — 15 
Trematospira camura. 
‘he £. concava, both in its exter- 
L. flabellites, L. fimbriata and L. acuti- 
plicata, I would propose to indicate 
forms of this external character with 
similar crura and spires as Celospira. 
The difficulty constantly attending the references of the Bra- 
chiopoda, to establish genera from external form and characters, 
renders it very desirable to search for the interior organization 
and appendages; but the condition of specimens does not alwa’ 
admit of satisfactory investigations, and not unfrequently the 
specimens possessed are so few as almost to preclude examina- 
tions of this kind. 
As an example of the diversity of internal structure in similar 
external forms, I may mention the Terebratula altidorsata of Bar- 
rande, which so nearly resembles the Centronella Glans-fagea that 
) utting a 
Celospira coneava, | 
