118 
the middle, that the septa were equally strong, and each furnished 
with a small crenated perforation in the middle, but not a continued 
syphon : the cells are not round, but in the section appear rather 
concavo-convex. The colour is of a pearly white. 
“ May not this be a variety of the JV. costatus of superior growth, 
occasioned by a more southern climate ? But whether it is found at pre- 
sent in a recent or living state, we are ignorant.” Test. Brit. Sup. p. 85. 
LETTER X. 
HIPPURITES DALMATIAN AND VERONESE FOSSILS OF A SIMILAR 
APPEARANCE BELEMNITES, OPINIONS RESPECTING SPECIES 
DESCRIBED. 
LXXY. Hippurites. A straight or conical shell, furnished in- 
ternally with transverse septa, and with two lateral, longitudinal, 
obtuse, and converging ridges ; the last chamber being closed by an 
operculum. 
The Baron Picot de la Peirouse first noticed these bodies, in a tour 
through that part of the Pyrenees which is in the neighbourhood of 
Monferrand and Jougragne, in the department of Aude, where they 
are known to the inhabitants by the name of Horns. He found them 
chiefly in a loose brown earth, and in the adjoining lime-stone rocks, 
grouped with a new species of fossil oyster, and various fossil coralline 
bodies. In consequence of observing that they were concamerated 
shells, he was induced to consider them as a new species of ortho - 
ceratites, notwithstanding that he discovered that they were furnished 
