90 KELLIAD A. 
as far as we know, confined to this species and Kellia rubra ; 
the third orifice in the mantle is a small sessile anal one. We 
believe the water to aérate the branchize enters by the pedal 
fissure, and when used, is expelled therefrom; it is possible 
that the curious anterior tube, which is a continuation of the 
mantle, may, mm conjunction with the central opening, also 
admit some water to the branchiz; but we will observe on 
this pomt by and by. 
On each side of the body there are a pair of narrow, symme- 
trical, pale yellow, striated lamine, and correspondent pairs of 
short, thick, strong, subtriangular, coarsely striated palpi; the 
liver is pale green, and m close connection with the ovarium, 
which is a thin membranous sac full of ova in the genial 
season. 
It is now proper to quire into the probable uses of the 
anterior anomalous tube. As there is no ostensible reason 
why nature should have departed from her accustomed plan 
to place that organ before, which in every other bivalve except 
K. rubra and this is behind, we cannot rationally conceive 
that this singular appendage is a special branchial tube, as the 
pedal orifice is most ample for the entry and expulsion of the 
aérating fluid; we therefore think the following facts will 
afford malacologists assistance in determining its functions. 
Whilst examining some K. suborbicularis, my attention was 
suddenly attracted by observing several testaceous young 
ejected from the anomalous tube; these I collected and have 
them now by me. Notwithstanding this fact, I have never, 
until lately, been able to discover, m any of the numerous 
ovaria I have imspected, anythimg except ova in different 
stages of advancement; but it is exceedingly probable that the 
shells I saw ejected may have been deposited in this tubular 
appendage of the mantle, and there received the development 
in which [ found them. 
Since this was written, I have to state subsequent facts 
resulting from the examination of a very large Kellia suborbi- 
cularis. I placed it on the umbones, when it immediately 
exserted and opened the tube; by the aid of a powerful lens, 
I counted at its fundus fifteen largely developed ova, and I 
