PTEROPODA. 351 
Pl. XIV., Fig., 38. Animal globular, with two simple oval fins. 
Distribution, 1 species. Off Newfoundland 
CYMBULIA, Peron and Lesueur, 
Fitymology, diminutive of cymba, a boat. 
Type, C. proboscidea, Pl. XIV., Fig. 39 (after Adams). 
_ Sheil cartilaginous, slipper-shaped, pointed in front, trun- 
cated posteriorly ; aperture elongated, ventral. 
Animal with large rounded fins connected ventrally by an 
elongated lobe ; mouth furnished with minute tentacles; lingual 
teeth 1.1.1; stomach muscular, armed with two sharp piates. 
Distribution, 3 species. Atlantic, Mediterranean, Indian 
Ocean. 
TIEDEMANNIA, Chiaje. 
Type, T. Neapolitana, Pl. XIV., Fig. 40. 
Named after Fr. Tiedemann. 
Animal naked, transparent, fins united, forming a large 
rounded disk; mouth central; tentacles elongated, conuate ; 
eye-tubercles minute. Larva shell-bearing. 
Distribution, 3 species. Mediterranean, Australia. 
Famity IJ.—LIMACINIDA. 
Shell minute, spiral, sometimes operculate. 
Animal with fins attached to the sides of the mouth, and 
united ventrally by an operculigerous lobe; mantle-cayity 
opening dorsally ; excretory orifices on the right side. 
The shells of the true limacinide are sinistral, by which they 
may be known from the fry of Atlanta, Carinaria, and most 
other Gasteropods. 
Lractwa, Cuvier 
Etymology, limacina, snail-like. 
Synonym, Spiratella, Bl. 
Example, L. antarctica (drawn by Dr. Joseph Hooker), 
PL ALY., Fig. 41. 
Shell sub-globose, sinistrally spiral, umbilicated; whorls 
transyersely striated; umbilicus margined; no operculum. 
Animal with expanded fins, notched on their ventral margins; 
operculum lobe divided ; lingual teeth 1.1.1. 
Distribution, 2 species. Arctic and Antarctic Seas; gre- 
garious. 
SPIRIALIS, Hydoux and Souleyet. 
H«cample, 8, buiimoides, Pl. XIV., Fig. 42. 
