4 
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ORTHID &. 241 
Orruis ovata, Pander. Beitr. zur Geogn. Russl., p. 83, pl. xvi A, fig. 9, 1830. 
the apex of the area. 
CALLIGRAMMA, Von Buch. Ueber Delthyris und Orthis, Berlin Trans., p. 58, 
1837 ; and Mém. Soc. Géol. de France, vol. iv, p. 206, pl. xi, 
fig. 2, 1840.—O. ovata, Von Buch, Berlin Trans., p. 59; 
and O. ORTHAMBONITES, p. 66, 1837. 
CALLACTIS, Sow. Silurian System, pl. xix, fig. 5, 1839. 
virGaTa, Id. Ib., pl. xx, fig. 15. 
ORTHAMBONITES, Von Buch. Beitr. zur Geb. Russl., p. 18, 1840. 
— D Eichwald. Sil. Syst. in Esthl., p. 150, 1840. 
FLABELLULUM, J. Hall (not of Sow.). Rep. 4th Geol. Dist. New York, p. 1035, 
fig. 5, and p. 107, 1843. 
— De Castelnau (not of Sow.). Terrains Sil. de Amérique du 
Nord, p. 37, 1843. 
CALLIGRAMMA, De Verneuil. Geoi. of Russia, vol. ii, p. 207, pl. xiii, figs. 
7—9, 1845. 
— Dav. London Geol. Journal, p. 65, 1847. 
Davipsont1, De Verneuil. Bull. Soc. Géol. de France, 2nd ser., vol. v, p. 341, 
pl. iv, fig. 9, 1848. 
CALLIGRAMMA (pars), Phillips and Salter. Mem. Geol. Survey, vol. ii, 
p. 374, 1848. 
_- Quenstedt. Handbuch, p. 485, pl. xxxviii, fig. 41, 1851. 
— MI Coy (including O. vircata). Brit. Pal. Foss., p. 214, 1852. 
— var. virGaTa, Salter. Quarterly Journal Geol. Soc., vol. vii, 
p- 171, 1851. 
FLABELLULUM, J. Hall (not of Sow.). Geol. New York, vol. 1i, p. 254, pl. lip 
fig. 6, 1852. 
Ontuisina Scotica, M‘Coy. Annals Nat. Hist., 2nd series, vol. viii, p.400, 1851; and 
Brit. Pal. Foss., p. 232, pl. i H, fig. 29, 1852. 
ORTHIS CALLIGRAMMA, F. Schmidt. Sil. Format. Ehstland; Archiv. Nat. Liv.- Ehst.- 
und Kurlands, vol. ii, p. 212, 1858. 
— Salter. Siluria, 2nd ed., pl. v, figs. 8, 9, 1859. 
oe D’Eichwald. Lethzea Rossica, Periode Ancienne, p. 827, 1899. 
— Dav. General Introduction, pl. vii, fig. 127, 1853. 
Davipsont, Lindstrim. Gotlands Brachiopoder, p. 370, 1860. 
CALLIGRAMMA, var. PRoAVA, Salter. Mem. Geol. Survey, vol. iii, p. 22, 
fig. 1, 1866. 
_ var, CALLIPTYCHA, Id. Ib., fig. 2. 
— », VIRGATA, fd. ID. dite, 3: 
— » SIMPLEX, Id. (not M‘Coy). Ib., fig. 4. 
Spec. Char. 'Vransversely semicircular, usually wider than long, broadest about the 
middle ; sides and front rounded; hinge-line slightly less than the width of shell. 
Ventral valve uniformly convex; beak small, incurved, not always protruding above 
Area moderately wide ; fissure triangular, open. Dorsal valve 
usually much less deep than the opposite one, most convex at the umbone, sometimes 
slightly depressed towards the front; hinge-area narrow. Surface of valves marked with 
31 
