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310 American Seashells
Eubranchus pallidus Alder and Hancock Painted Balloon Eolis
Arctic Seas to Boston, Massachusetts. Europe.
Plate i5h
% inch in length, characters as shown in our figure and the generic
description. Uncommon (?),
Genus Coryphella Gray 1850
Branchiae numerous, clustered, elongate or fusiform. Foot narrow,
with the anterior angles much produced. Radula with a single longitudinal
series of central teeth which bear a large central denticle and several marginal
denticles. There is a denticulated lateral tooth on each side of the central.
Coryphella rufibranchialis Johnston Red-fingered Eolis
Arctic Seas to New York. Europe.
Plate 15a
I inch in length, characters as shown in figure and in the generic de-
scription. Common (?) in New England.
Subclass PULMONATA Order BASOMMATOPMORA
Family SIPHONARllDAE
Genus Siphonaria Sowerby 1824
Shells closely resembling the true limpets, Acmaea, but at once distin-
guished by the nature of the muscle scars on the inside. In both, the long,
narrow scar is horseshoe-shaped, but in Siphonaria the gap between the ends
is located on one side of the shell, while in Acmaea it is located at the front
end. In some Siphonaria, the area near the gap is trough-shaped. These
are air-breathers and are more closely related to the land garden snails than
to the gill-bearing, water-breathing limpets.
Siphonaria pectinata Linne Striped False Limpet
Eastern Florida, Texas, Mexico and St. Thomas.
Figure 65b
I inch in length, rather high, with an elHptical base. Exterior with
numerous, fine, radial threads or rather smoothish. Color whitish with nu-
merous, brown, bifurcating, radial lines. Interior glossy, similarly striped.
Center cream to brown. Muscle scar with 3 swellings, the gap occurring between
the two at the side. Do not confuse with Acmaea leiicopleura which
commonly has a blackish owl-shaped figure inside. Common along the shores
on rocks. This is S. ?iaufragum Stearns and S. lineolata Orbigny.