109 
November 22, 1853. 
Dr. Gray, Vice-President, in the Chair. 
The following papers were read :— 
1, Descriptions or Two New Species or Hummine Birps, 
From Perv. By Joun Govuxp, F.R.S. 
1. SpATHURA CISSIURA. 
General plumage bronzy green; wings purplish brown ; four outer 
tail-feathers purplish steel black ; under surface green, paler on the 
throat ; thighs thickly plumed and of a reddish buff. 
Total length, 44 inches; bill, $; wing, 12; tail, 23. 
Hab. Peru. 
Remark.—Most nearly allied to Spathura Peruana, but differing 
from that and all the other members of the genus, in having the outer 
tail-feathers webbed throughout their entire length, and consequently 
the spathulate tips less conspicuous. 
2. CALOTHORAX MiIcRURUS, Gould. 
All the upper surface mealy bronzy green; throat of a glittering 
amethystine hue; under surface buff, deepest on the sides; tail 
narrow, rigid and black. 
Total length, 2% inches; bill, 1,9,; wing, 1,5;; tail, 4. 
Hab. Peru. 
Remark.—This is a very diminutive species, and differs from all 
others in the extreme shortness of the tail, which is exceeded in 
length by both the upper and under coverts. 
2. Descriptions or Two New GENERA (PFEIFFERIA AND 
JANELLA) OF Lanp Mo.uusca. 
By J. E. Gray, Pu.D., F.R.S., V.P.Z.S. 
Some years ago I described a new genus of Helices under the name 
of Nanina, remarkable from the mantle of the animal being reflexed 
and produced over the surface of the shell, as in Vitrina, but differing 
from that genus in the shell being more Helicoid, and in the mantle 
pot being produced in front, or forming a kind of shield over the 
back of the neck; this genus has been very generally adopted, and 
now contains a large number of species. 
The animal of Nanina, like the Parmacelle and Helicariones, has 
the hinder part of the uppermost extremity of the foot truncated and 
furnished with a linear perpendicular gland with thickened lips. 
Mr. Cuming, who lately supplied me with a number of animals of 
shells in spirits, sent me, along with other kinds, specimens of a shell 
which Dr. Pfeiffer has described under the name of Helix micans, 
which at once attracted my attention, on account of the shell near 
