72 ARCAD A. 
us; we believe it has only occurred in the Hebrides. We 
doubt the distinction. 
GALEOMMA anp LEPTON, Turton. 
The genera Galeomma and Lepton have received from the 
hands of Dr. Turton a conchological constitution, but as 
respects natural position, they have been buffeted from place 
to place, im accordance with the various views of naturalists. 
In some systems they are associated with the Kelliade, though 
doubtfully, on account of the want of knowledge of the animal. 
These disturbing causes are happily im a great measure removed, 
and we have it im our power to fix permanently these wanderers 
in. the only British family that has with them a sufficiently 
corresponding community of attributes. Though they are 
aberrant genera of the Arcadan type, when strictly consi- 
dered they undoubtedly belong to that family, and it will be 
shown that they have the strongest claims to this their natural 
lineage. 
To establish a new family for these beautiful genera would 
indeed be a superfluous labour, and repugnant to our well- 
known feelings to add unnecessarily to a host of worthless 
positions, when there is already an unmistakeable resting-point. 
But our descriptive notes will further explam these matters. 
GALEOMMA, Turton. 
G. Turtron1, Sowerby. 
G. Turtoni, Brit. Moil. 11. p. 105, pl. 36. f. 115 (animal) pl. O. f. 5. 
Animal oval, fleshy, pure white; mantle of thin texture, 
except at the edge, which is muscular, and forms a tumid cord 
that extends beyond the shell, from which are thrown off 
undulated double margins, one of which lines the shell, and is 
marked with equidistant frosted-white eminences or ocelli, 
eight or nine on each side, with fine white filaments between 
them. The mantle is partly closed in front, but there is an 
anterior pedal aperture. The foot is long, cylindrically taper- 
ing to its termination; at the heel, close to the body, is the 
in pen Sie, 
