GASTEROPODES. 307 
9. Kots mMonoceros.— Unicorn Eolis.—Plate XLV. Fig. 1. 
I am induced to allude, in this imperfect paragraph, to a specimen 
of the Kolis, with an organ which, from the preceding, may not be a 
monstrosity. 
Length three lines ; body lanceolate, slender, with three scanty 
clusters of long ellipsoidal papillee on each side of the back. A pillar 
rises from the middle of the neck, which diverges into two cornicula, 
with about seven whirls in each. The pillar and corniculum equal each 
other's length ; and their joint length equals that of the tentacula. The 
pillar is plain. It is situated between two black specks. Colour of the 
body white ; centre of the papillee dark. 
This is a lively little animal, bristling up the papillae on any 
annoyance. 
Only a single specimen has occurred, and a drawing made of the 
corniculum. Before the whole subject could be executed, it had crawled 
out of the water and perished. 
PLATE XLV. 
Fic. 1. Holis monoceros—Unicorn Kolis.—Corniculum, enlarged. 
10. Hous tenAx—The Adhering Eolis.—Plate XLV. Figs. 2, 3. 
Length seven lines ; body lanceolate, slender ; shoulders elongated, 
in triangular processes. ‘Tentacula and cornicula extending about two 
lines. A black speck at the base of each of the former. Back rather 
meagrely clothed with elongated branchial papille, not definitely ar- 
ranged in clusters. Colour light watery blue. A white line traverses 
the upper surface, also the back of the cornicula and tentacula. Papille 
partly orange. The whole extremities tipped with white. 
A specimen occurred among the Tubularia polyceps, where it fed on 
the epidermis of the zoophytes. It was small, and had few papilla. At 
first the length of the cornicula and tentacula was equal to about a third 
of the whole animal, which grew rapidly ; but they did not extend in 
