94 LIMACINID AS. 
disk; mouth central; tentacles elongated ,connate ; eye-tubercles 
minute. Larva shell-bearing. 
coroLLA, Dall, 1871. Like Tiedemannia, but with the body 
pendant below, unattached to the pinnee, ovoid, constricted 
above; oesophagus produced, aperture trumpet-shaped, produced 
into two points ; pinne forming a single disk with reticulated 
muscular bands, separated by a deep sinus from the oral portion. 
No shell. 7. spectabilis, Dall. N. Pacific Ocean. 
Famity LIMACINID A. , 
Shell minute, spiral, sinistral, calcareous. Operculum pauci- 
spiral, vitreous. 
Animal with fins attached to the sides of the mouth, and 
united ventrally by an operculigerous lobe ; mantle-cavity large, 
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 gastropods. 
Limacrna, Cuvier, 1817. 
Ktym.—Limacina, snail-like. Syn.—Spiratella, Bl., 1824. — + 
Distr.—2 sp. Arctic and Antarctic Seas; gregarious. LL. 
Antarctica, Forbes (xlii, 20°. 
Shell subglobose, sinistrally spiral, umbilicated ; whorls trans- 
versely striated ; umbilicus margined. 
Animal with expanded fins, notched on their ventral margins. 
VALVATELLA, Morch, 1874. 
Syn.—Planorbella, Gabb, 1872 (not Haldeman). 
Distr.—Tertiary ; Sicily, Denmark, West Indies. V. atlanta, 
Morch. P. imitans, Gabb. 
Shell minute, vitreous, sinistral, apex sunken as in Planorbis. 
The type, a West Indian fossil, might be taken for a young 
specimen of Planorbis trivolvis were it not sinistral. 
SPIRIALIS, Eydoux and Souleyet, 1840. 
Syn. — Heterofusus, Fleming, 1825. Heliconoides, d’Orb. 
Peracle, Forbes. Scea, Ph., 1844. : 
Distr.—12 sp. Greenland and Norway to Cape Horn, Indian 
Ocean, Pacific. S. ventricosa, Eyd. (xlii,21). Fossil. Eocene; 
Paris basin. Pliocene; Sicily, Rhodes. 
Shell minute, hyaline, sinistrally spiral, globose or turreted, 
imperforate or narrowly perforated, smooth or reticulated ; oper- 
culum thin, glassy, semilunar, sliohtly spiral, with a central 
muscular sear. 
Animal with narrow, simple fins, united by a simple, transverse 
operculigerous lobe; mouth central, with prominent lips. 
