Dr. A. Giinther on a@ new Triprion. 279 
invagination comparable to the invagination of the hood of 
the Escharina and Cellularina. This is due, no doubt, to the 
very great reduction of this organ in the larva of the Cteno- 
stomata—a reduction which continues during the first stage of 
the metamorphosis, so that at the moment when the circlet 
has penetrated into the interior we can scarcely indicate the 
position of the hood, which seems to have entirely dis- 
appeared. ‘eR 
Notwithstanding this, it has often seemed to me that, to- 
wards the superior posterior part of the mass of the circlet, 
at the place corresponding to the hood, there could be seen a 
cellular mass which I should be tempted to regard as pro- 
ceeding from the cells which formed the central organ of the 
hood. This cellular mass seemed to me to form the essential 
part of the future rudiment of the polypide; nevertheless I 
have sometimes met with a second, smaller rudiment, forming, 
so to speak, a pendant to the former one, and situated at the 
inferior and anterior part of the aggregation of cells of the 
ceirclet. Perhaps we have here two parts comparable to the 
two rudiments described in the larve of Escharina. This 
part of my researches is still incomplete. 
[To be continued. ] 
XXVI.—Notice of a second Species of Triprion. 
By Dr. A. GUNTHER, F'.R.S. 
Hr. Forrer, who has just returned from a collecting expe- 
dition in Central America, has brought with him three living 
specimens of a Triprion, which he found near Presidio, in 
Mexico, and which evidently belong to a species different 
from, and larger than, 7. petasatus. 
This species may be called Triprion spatulatus, having a 
longer and broader snout than 7’. petasatus; the bony ridges, 
especially the supraorbital and supratympanic ridges, and the 
canthus rostralis project in a much less degree; and the 
interorbital space is much less concave. The coloration is a 
uniform light olive, without any spots, changing in intensity 
of shade only; the upperside of the head is sometimes of a 
ellowish-bronze colour. 
Other distinguishing characters may be found when the 
specimens are dead and more accessible to examination. At 
present, I may add only that the pupil is transversely oval 
when expanded, and subquadrangular when more contracted, 
but never vertical. It can be shut entirely. 
