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PERACLIDAE 293
Spiratella lesueuri Orbigny Lesueur's Pteropod
Figure 64b
Cape Cod, Massachusetts, south to Brazil. Indo-Pacific. (N. Lat. 42°
to S. Lat. 40°).
1.5 mm. in length, spire elevated somewhat; umbilicus distinct. Shell as
long as wide. Spiral lines only around the umbilicus.
Spiratella bulmwides Orbigny Bulimoid Pteropod
New York to southern Brazil. (N. Lat. 39° to S. Lat. 40°).
Figure 6^d
2 mm. in length, spire high, shell twice as long as wide. Umbilicus very
indistinct. Lip fragile and often broken. 6 to 7 whorls.
Spiratella inflata Orbigny Planorbid Pteropod
Figure 64h
Cape Cod, Massachusetts, to Argentina. (N. Lat. 42° to S. Lat. 40°).
1.5 mm. in length, spire depressed, with the globose whorls in one plane
to give a planorboid shape. Limacina scaphoidea Gould is this species.
Family PERACLIDAE
Genus Feracle Forbes 1844
Shell fragile, with sinistral or left-handed whorls (resembling the fresh-
water pond snail, Physa); aperture very large and elongated; columella pro-
longed into an elongate rostrum; no umbilicus. Operculum thin, paucispiral,
sifiistral and subcircular in outline. There are only two species in the genus.
PeracUs Pelseneer is the same genus.
Feracle reticulata Orbigny Reticulate Pteropod
Worldwide, pelagic. (40° N. to 20° S.).
Figure 64g
4 mm. in length, brownish yellow, sinistral and with 4 whorls. Suture
deep. The surface exhibits a raised hexagonal reticulation, the sides of the
hexagons bearing a regular row of minute teeth. P. physoides Forbes and
P. clathrata Eyd. and Soul, are the same.
Feracle bispinosa Pelseneer Two-spined Pteropod
Atlantic, pelagic. (38° N. to 28° S.).
Figure 6i\i
7 mm. in length, milky-white, similar to reticulata, but with a wide,