Mr. Woops on the Species of Fedia. 425 
also a tooth opposite to this, and, consequently, the number of teeth in the 
imaginary regular type must always be even. When the contrary is the case, 
it is because an additional intermediate tooth is developed on one side more 
than on the other, producing some degree of irregularity; or, perhaps, we 
should rather say that one of the lateral segments—for it is there principally 
that the irregularity takes place—is more subdivided than its opposite one. In 
the Psilocele the case is exactly the reverse. The middle tooth of the anterior 
face is wanting, and the number of teeth in the type must be considered as 
uneven. But the lateral teeth in this division are usually small, and often 
unequally developed, so that there is one tooth, or perhaps even two, more on 
one side than on the other. Thus an even number of teeth may occasionally 
occur, but it ought hardly to enter into the specific character. Reichenbach's 
figures often attribute to the Psilocele a tooth in the centre of the anterior 
` face. I can only say that I have never met with such a circumstance. 
Div. 3. PLATYCŒLÆ. 
We now pass to the P/atycele. In several species of this division the 
barren cells are contiguous at top and bottom, so that a section of the fruit 
would there be nearly round, but they are separate in the middle. In F. Au- 
ricula (fig. 15.) they are contiguous for their whole length; and in F. echinata 
(fig. 16.) they may be said to touch in their whole length, but without having 
a common partition. The two cells are not in any part united in any of them. 
F. uncinata and F. echinata, both of which I incline to place in this division, 
have been already mentioned. The former was brought by the Chev. de Steven 
from Caucasus, but has not, I believe, hitherto been found in Europe; the 
latter is frequent in the neighbourhood of the Mediterranean. In F. Auricula 
the inner sides of the barren cells sometimes shrink away in drying, and give 
to the fruit somewhat of the appearance of that of the Selenocele, and well 
characterized by the expression “fructu anticé rimoso," used by De Candolle 
to some of that tribe. F. tridentata (fig. 17.) of Reichenbach is a variety of 
F. Auricula. The terminating tooth in this species is often very small, thin, 
membranous and fragile. Gaudin describes it 3—6-dentata. I have never 
observed more than 3 teeth. De Candolle's expression, “ calycis limbo acuté 
auriculiformi" would suit some of my specimens, but the tooth is not always 
