158 GALBOMMA. 



PEONT. The surface of a shell on which the aperture appears. 



EULCEUM. That part of a shell on which any other part rests 

 or turns. The term is applied more particularly to the tumid 

 part ia the hinge or bivalve shells on which the ligament is 

 fixed. 



PTJLGUE. Montf. 1810. Pteula perversa, Auct. and such 

 other species as have an angulated spire. Fig. 388. 



PUSIFOEM. (Fusus, a spindle.) Shaped like a spindle, swell- 

 ing in the centre and tapering at the extramities. Ex. Fusus, 

 fig. 387. 



FUSUS. Lamarck, (1801.) (A spindle.) Fam. Canalifera, 

 Lam. Siphonostomata, Bl. — Descr. Fusiform, turrited, with 

 many rounded whorls ; aperture generally oval, termiuating in 

 a long straight canal ; operculum horny, pyriform. — Obs. The 

 Fusi are subject to considerable variations in form. The recent 

 species are numerous and do not appear to be confined to any 

 climate. The fossil species are also numerous, chiefly abound- 

 ing in the tertiary formations. Mr. Eeeve's Monograph con- 

 tains 79 species. The recent species are mostly tropical. PI. 

 ivii. fig. 387, F. Colus. Priority has been claimed for the 

 generic name " Colus," used by Plumphrey ia 1797, but without 

 any description. 



G-ADILA. Synopsis of Brit. Mus. Dentalium G-adus. Martyn. 



G-ALATHJEA. Brug. 1798. Potamophila, Sow. Megadesma. 

 Bowd. 



GrALEA. KleiQ. Puepuea, Auct. 



GrALEOLAEIA. Lam. (From Galea, a helmet or crest.) A 

 genus composed of species of Seepula, 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.— -06«. This genus is said by Lamarck to resemble 

 Vermilia in other respects, but to differ in having the anterior 

 part raised. Africa and Australia. G. decumbens. PI, i. fig. 6. 



GALEOMMA. Turton, 1835. Fam. Pholadaeia, Lam. — 

 Descr. Thin, oval, equivalve, equilateral, with the ventral margin 

 gaping ; hinge with one cardinal tooth in each valve ; muscular 

 impressions two, approximate ; palleal impression interrupted, 



