PYRIFORM. 243 



tata, E. M. 374. f. 4. mendicaria, 375. f. 10. turturina, 314. 

 f. 2. fulgurans. Lam." Sw. Malac. p. 313. 



PUSTULARIA. Sw. A genus of " Cyprseinse," Sw. thus de- 

 scribed : " Shell generally marked by elevated pustules ; aperture 

 narrow and linear ; the extremities more or less produced ; the 

 teeth continued beyond, and frequently forming elevated strise 

 across the lips. P. Cicercula, P. Globulus." Sw. Malac. p. 324. 



PYGMiEA. Humph. Columbella, Auct. 



PYLORIDEA. Bl. The ninth family of the order Lamelli- 

 branchiata, Bl. the shells of which are described as nearly always 

 regular, rarely otherwise, nearly always e qui valve, gaping at 

 both extremities ; hinge incomplete, the teeth becoming gradually 

 obsolete ; two distinct muscular impressions ; palleal impression 

 very flexuous posteriorly. This family is divided into : Section 

 1. Ligament internal ; Pandora, Thracia, Anatina, Mya, Lutricola. 

 Section 2. Ligament external ; Psammocola, Soletellina, Solen, 

 Sanguinolaria, Solenocurtus, Solenimya, Panopsea, Glycimens, 

 Saxicava, Byssomya, Rhomboides, Hiatella, Gastrochsena, Cla- 

 vagella, Aspergillum. 



PYRAMIDAL. (Pyramidalis.) Resembling a pyramid in form. 

 Ex. Cerithium Telescopium, fig. 378. 



PYRAMIDELLA. Lam. (A little pyramid.) Fam. Plicacea, 

 Lam. Auriculacea, BL— Bescr. Pyramidal, smooth, polished ; 

 spire long, pointed, composed of numerous whorls ; aperture 

 small, modified by the last whorl, rounded anteriorly ; outer lip 

 slightly expanded ; columella tortuous, with several folds. This 

 is a genus of small, polished, marine shells. Pyramidella Tere- 

 bellum, fig. 342. 



PYRAZUS. Montf. Potamis, Brongniart. 



PYRELLA. Sw. A genus consisting of Turbinella Spirilla, Auct. 

 and similar species, having a long channel, a pyriform outline, 

 and one strong plait at the base of the columella, the apex of the 

 spire is enlarged. P. Spirillus, fig. 384. (The proper term 

 would be Spirilla.) 



PYRIFORM. (Pyrum, a pear; forma, shape.) Shaped like a 



r 2 



