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 



Figure 6^d 



New York to southern Brazil. (N. Lat. 39° to S. Lat. 40°). 



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 



Figure 64g 



Worldwide, pelagic. (40° N. to 20° S.). 



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 



Figure 6i\i 

 Atlantic, pelagic. (38° N. to 28° S.). 



7 mm. in length, milky-white, similar to reticulata, but with a wide, 



