GARI. 45 
degree of organization, than even the Radiata. Not recogniz- 
ing these microscopic bedies as shells, properly so called, but 
considering them sufficiently numerous and interesting to form a 
distinct branch of study, I do not think it desirable to describe 
the genera or to present any arrangement of them in this work. 
FORNICATED. Arched or vaulted, as the costz of Tridacna 
Elongata, fig. 157. 
FRONT. The surface of a shell on which the aperture appears. 
FRONDICULA‘RIA. D’Orb. A genus of microscopic Forami- 
nifera. 
FUL’'GUR. Montf. Pyruza perversa, Auct. and such other 
Species as have an angulated spire. Fig. 388. 
FU'SIFORM. (Fusus, a spindle.) Shaped like a spindle, swelling 
in the centre and tapering at the extremities. Hz. Fusus, 
fig. 387. 
FU'SUS. Lam. (A spindle.) Fam. Canalifera, Lam. Siphono- 
stomata, Bl. Deser. Fusiform, turrited, with many rounded 
whorls; aperture generally oval, terminating in a long, straight 
canal; operculum horny, pyriform. Obs. The Fusi are subject 
to considerable variations in form. The recent species are nu- 
merous and do not appear to be confined to any climate. The 
fossil species are also numerous, chiefly abounding in the tertiary 
formations. Fig. 387, Fusus Colus. 
GALATH/#’A. Brug. Poramopuira, Sow. Megadesma Bowd. 
GA’LEA. Klein. Purpura, Auct. 
GALEOLA’RIA. Lam. (From Galea,a helmet, or crest. ) A 
genus composed of species of Szerpuna, Auct. distinguished as 
being fixed by the side of the shell, and having the anterior 
extremity erect, the aperture terminating in a tongue-shaped 
projection. Cbs. This genus is said by Lamarck to resemble 
Vermilia in other respects, but to differ in having the anterior 
part raised. Fig.6, G. decumbens. 
GALEOM’MA. Turt. Fam. Puovaparia, Lam. Deser. Thin, 
oval, equivalve, equilateral, with the ventral margin gap- 
ing; hinge with one cardinal tooth in each valve; muscular 
impressions two, approximate; palleal impression interrupted, not 
sinuated; ligament small, partly internal, partly external, fixed 
on a prominent fulcrum. Obs. The wide hiatus in the ventral 
margins of this equilateral shell prevents the possibility of con- 
founding it with any other. Four or five recent species are 
known, one of which is found on the coast of Sicily. G. Turtoni, 
fig. 58. 
GALERICULUS. (Galericulum, a little cap or bonnet.) Veiu- 
TINA, Auct. 
GA’PING. Bivalve shells are said to gape when the margins do 
not meet allround. Ez. Gastrocheena, fig. 52. 
GA’RI. Schum. Psammosia, Lam. 
