Mr. F. Walker on some new species of Chaleidites. 125 
and in a locality not very distant from mine, the earth from Lough 
Island-Reavey is almost wholly different, including but few spe- 
cies, and the more numerous of these found but sparingly in the 
Lough Mourne deposits. 
The following make up nearly the entire mass of the earth 
described by Dr. Drummond :— 
Navicula gracilis. Tabellaria fenestrata. 
Himantidium arcus. ventricosa. 
pectinale. 
A few frustules of the following also occur :— 
Surirella splendida. Epithemia zebra. 
Navicula viridis. Cocconema lanceolata. 
The profusion in which N. gracilis, H. pectinale and T. fenes- 
trata occur in this deposit, would lead to the conclusion that the 
waters of the lake in which it had been found were the drainage 
of a subalpine district, whose surface was almost exclusively 
peat, while the Lough "Mourne deposit would, even to the phi- 
lomicros unacquainted with its locality, indicate the neighbour- 
hood of clear springs, grassy pastures and a low elevation. In 
this way these minute organisms may afford matter for interest- 
ing speculation, and when occurring in a fossil state may possibly 
be made available in the researches of the geological inquirer. 
Wareham, January 10, 1850. 
XV.—Notes on Chalcidites, and Descriptions of various new 
species. By Francis Waker, F.L.S. 
[Continued from vol. iii. p. 210.] 
Cavuponlia, nN. g. 
Fem. Head and chest convex, very finely shagreened : head thick, 
a little broader than the chest : feelers slender, subclavate ; first joint 
long, slender ; second cup-shaped ; third and fourth very small ; the 
following from the fifth to the tenth successively but slightly de- 
creasing in length and increasing in breadth; club long-elliptical, 
broader than the tenth joint, and more than twice its length: chest 
spindle-shaped, much developed: fore-chest rather long, having a 
slight transverse ridge near the hind-border whence it declines and 
grows narrower and forms a short neck : shield of the mid-chest very 
long; sutures of the parapsides distinct for rather more than two- 
thirds of the length of the chest, but thence quite obsolete; axille 
parted by rather less than one-fifth of the breadth of the chest; 
scutcheon nearly conical, with a slight transverse suture towards the 
hind-border ; hind-scutcheon transverse, but rather large : hind-chest 
well developed, obconical, declining, with a ridge along the middle 
and asuture on each side : petiole short : abdomen long-oval, smooth, 
shining, slightly concave above, rather deeply keeled beneath, some- 
what broader and a little shorter than the chest ; metapodeon occu- 
