FAMILY 5. PLICACEA. 149 
mal inhabitants, were supposed to be intermediate in their organization 
between the Melanie and the Auricule. They had been variously distri- 
buted by authors ; Linnzus included them with the Trochi, Miller with 
the Helices, and Bruguiére with the Bulimi ; the Tornatelle are, however, 
the only mollusks to which they are intimately allied, both having the 
aperture of their shells entire and operculated, besides being strongly 
plaited on the columella. 
The shell of Pyramidella may be described as being turriculated, po- 
lished, composed of many whorls, and sharp at the apex; the aperture 
is entire, and narrowed towards the upper part; the lower part of it is 
rounded ; the columella has generally three plaits, and the lip is sharp 
and somewhat expanded. The operculum is small, thin and horny. 
Examples. 
Pl, CCVII. Fig. 1. 
PyraAMIDELLA GLANS, Nobis, Proceedings Zool. Soc., 1842. 
Pl. CCVII. Fig. 2 and 4. 
PyraMIDELLA cincta, Nobis, Proceedings Zool. Soc., 1842. 
Pl. CCVIL. Fig. 3: and‘ 7. 
PyRAMIDELLA MACULOSA, Lamarck, Anim. sans vert., vol. vi. part 2. 
p- 223. Encyclopédie Méthodique, pl. 452. f.1.a,6. Kiener, Ico- 
nographie des Coquilles, pl. 2. f. 5. and 5a. 
Pl. CCVII. Fig. 5 and 6. 
PyraMIDELLA PLicaTa, Lamarck, Anim. sans vert., vol. vi. part 2. p. 223. 
Encylopédie Méthodique, pl. 452. f.3. a, b. 
Voluta spirals, Rumphius. Wood. 
Pyramidella punctata, Wagner. 
Pl. CCVIL. Fig. 8. 
PyRAMIDELLA VENTRICOSA, Quoy and Gaimard, Voyage de |’Astrolabe, 
Zoologie, pl. 65. f.37. Kiener, Iconographie des Coquilles, pl. 1. f. 1. 
