GER. GON.] 



LAMELLIBRANCHIA TA. 



481 



Gervillia, DeFrance, 1820, Diet. Sci. Nat., 

 xviii. [Ety. proper name.] Type G. 

 anceps. Tdis genus is probably un- 

 known in the American Palaeozoic 

 rocks. 



auricula, see Monopteria auricula. 



tonga, see Avicula longa. 



longispina, see Monopteria longispina. 



strigosa, see Pterinea strigosa. 



sulcata, see Bakevellia sulcata. 

 GLOSSITES, Hall, 1885, Pal. N. Y., vol. 5, p. 

 49. [Ety. glosse, the tongue.] Equi- 

 valve, inequilateral, elliptical ; anterior 

 end short, margin declining from the 

 beak and curving below ; posterior end 

 large, broadly rounded ; beaus small, 

 appressed ; cardinal line long, gently 

 arcuate ; umboual slope not defined ; 

 surface marked concentrically ; ligament 

 external; lunule distinct; muscular im- 

 pressions shallow. Type G. lingualis. 



amygdalinus, Winchell, 1863, (Sanguino- 

 lites amygdalinus,) Proc. Acad. Nat. 

 Sci. Phil., p. 13, and Pal. N. Y., vol. 5, 

 p. 501, Waverly Gr. 



depressus, Hall, 1885, Pal. N. Y., vol. 5, p. 



496, Chemung Gr. 



ellipticus, Hall, 1885, Pal. N. Y., vol. 5, p. 



498, Chemung Gr. 



lingualis, Hall, 1885, Pal. N. Y., vol. 5, p. 



497, Chemung Gr. 



patulus, Hall, 1885, Pal. N. Y., vol. 5, p. 



501, Chemung Gr. 

 procerus, Hall, 1885, Pal. N. Y., vol. 5, p. 



499, Chemung Gr. 



rudicula, Hall, 1885, Pal. N. Y., vol. 5, p. 



498, Chemung Gr. 



subnasutus, Hall, 1885, Pal. N. Y., vol. 5, 

 p. 500, Chemung Gr. 



subtenuis, Hall, 1885, Pal. N. Y., vol. 5, p. 

 495, Ham. Gr. 



teretis, Hall, 1885, Pal. N. Y., vol. 5, p. 

 494, Up. Held. Gr. 



^1 GLYPTOCARDIA, Hall, 1885, 



MB Pal. N. Y., vol. 5, p. 35. 



>|P [Ety. glyptos, sculptured; 



FIG. 826. cardia, the heart.] Shell 



lyptpcardia small, equivalve, inequi- 

 speciosa. lateral, broadly elliptical 



or subcircular; beaks incurved; sur- 

 face plicated and marked with concen- 

 tric striae ; no area beneath the beaks. 

 Type G. speciosa. 



speciosa, Hall, 1843, (Avicula speciosa,) 

 Geo. Sur. 4th Dist. N. Y., p. 243, and 

 Pal. N. Y., vol. 5, p. 426, Ham. and 

 Portage Grs. 



GLYPTODESMA, Hall, 1883, Pal. N. Y., vol. 5, 

 pt. 1, p. 4. (Plates and Explanations.) 

 [Ety. glyptos, sculptured ; desma, a liga- 

 ment.] Aviculiform, ligamental area 

 striated, continuous, hinge with two 

 strong lateral teeth, and numerous ir- 

 regular transverse plications along the 

 cardinal margin ; surface concentrically 

 striated. Type G. erectum. 



cruciforme, Conrad, 1841, (Avicula cruci- 

 formis,) Ann. Rep. N. Y., p. 54, 

 Ham. Gr. 



erectum, Conrad, 1842, (Avicula erecta,) 



Jour. Acad. Nat. Sci., vol. 



8, p. 238, and Pal. N. Y., 



vol. 5, p. 153, Ham. Gr. 

 erectum var. obliquum, Hall, 



1883, Pal. N. Y., vol. 5, pt. 



1, p. 155, Ham. Gr. 

 occidentale, Hall, 1883, Pal. 



N. Y., vol. 5, pt. 1, p. 157, FIG. 827. 



Up. Held Gr. Glyptodesma 



subrectum, Whitfield, 1882, erectum - 



(Actinodesma subrectum,) Ann. N. Y. 



Acad. Sci., vol. 2, p. 215, Ham. Gr. 



FIG. 828. Glytodesma erectum. Mold of left 

 valve, showing pallial line, muscular scar, tu- 

 bercles in the interpallial area representing 

 points of muscular attachment. 



GONIOPHORA, Phillips, 1848, Mem. Geo. Sur 

 Gt. Brit., vol. 2, p. 264. [Ety. gonia, an 

 angle; phoros, bearing.] Goniophorus 

 was used by Agassiz for a genus of 

 Echinoderms in 1840. Equivalve, very 

 inequilateral, rhomboidal or trape- 

 zoidal, obliquely truncate behind, 

 rounded in front ; cardinal line straight ; 

 beaks small, umbo prominent, and slope 

 continued as a ridge to the post-inferior 

 margin ; oblique, undefined sinus from 

 anterior to the beaks to basal margin ; 

 surface concentrically lined; hinge 

 with an oblique fold or tooth in the 

 left valve beneath the beak, and a cor- 

 responding depression in the right 

 valve; ligament external, attached by 

 one or more grooves ; anterior muscu- 

 lar impression deep, situated anterior 

 to the beak ; posterior muscular im- 

 pression shallow, situated on the poste- 

 rior cardinal slope ; pallial line simple. 

 Type G. cymbiformis. 



acuta, Hall, 1870, (Sanguinolites acutus ) 

 Prelim. Notice Lam., Shells, p. 37, and 

 Pal. N. Y., vol. 5, pi. 43, figs. 1-3 

 Ham. Gr. 



alata, Hall, 1885, Pal. N. Y., vol. 5, p. 294 

 Schoharie grit. 



bellula, Billings, 1874, Pal. Foss., vol. 2 n 

 136, Up. Sil? 



