428 
MOLLUSCA. 
mouth two fasciculi of retractile tentacula; destitute of eyes; 
with two opposite, small, ovate wings, inserted on the side of 
the neck; upper part of the body having two branchial, pinnated 
lines; anal orifice lateral. No shell. 
Genus 2.—C Y M B ULI A.— Cuvier. 
Generic Character. —Body oblong, gelatinous, pellucid, in¬ 
closing a shell; head sessile; two eyes, and two retractile ten¬ 
tacula ; mouth with a retractile proboscis; two opposite, oblong- 
ovate, branched wings, connate at their posterior base.—Shell 
gelatino-cartilaginous, transparent, and oblong; apex truncated; 
the aperture lateral. 
Cymbulia Peronii. —Peron’s Cymbulia. 
Plate LXXXVII. fig. 6. 
Somewhat gelatinous, or cartilaginous; very transparent crys¬ 
talline ; oblong, pointed at the vertex, truncated at the base; 
general shape like a Turkish slipper. Two inches long. Inha¬ 
bits the Mediterranean. 
Genus 3. —LIMACINA.— Lamarck. 
Generic Character. —Body soft, oblong, two branchial fins 
situated at the base of the neck ; posterior part of the body spi¬ 
ral, and enveloped in a shell.—Shell thin, fragile, papyraceous, 
spiral, with the volutions articulated in a discoid form. 
Limacina helicialis. —The Helix-like Limacina. 
Plate LXXXVII. fig. 11. 
Thin, fragile, spiral; the volutions united in a discoid form. 
Half an inch in diameter. Inhabits the North seas. 
Genus 4.—CLEODORA.— Peron. 
Generic Character. —Body oblong, gelatinous, contractile ; a 
head in front with two wings, and the posterior part enveloped 
in a shell ; head distinct, projecting, and round; two eyes ; 
mouth in the form of a small beak ; destitute of tentacula ; two 
opposite membranaceous, pellucid, and cordated wings, placed 
at the base of the neck. — Shell gelatinoso-cartilaginous, trans¬ 
parent, and in the form of a reversed pyramid. 
