ANIMALS. 83 
Order SARCICOBRACHIA, J. E. Gray. 
99) 
Diugnosis.—*‘ The oral arms fleshy, without any shelly support. 
Family Lineup (Les Lingules), Cuvier, 1800. 
The shells of this family are more or less elongated longitudinally, pointed at the 
beaks, sub-equivalve, regular, covered with an epidermis, and attached to marine 
bodies by a peduncle passing out between the beaks of the valves. The branchial 
system differs somewhat from that of other known Palliobranchs in consisting, though 
perhaps only partially, of slightly-developed tufts or processes originating from the 
great pallial vessels. 
Genus Lingula, Bruguiere. 
Diagnosis —“ Testa subzequivalvis, planulata, ovato-oblonga, apice truncata, 
basi subacuta, pediculo, carnosa tendineo, basi affixo elevata. Cardo edentulus.’” 
(Lamarck.) 
This is probably the most long-lived genus with which the paleontologist is 
acquainted. Its remains are found in the very earliest fossiliferous rock (vide note, 
p- 82); and it is still living at the present day; but what is most remarkable, it has 
never, during any period, been represented by more than a few species. 
LINGULA CREDNERI, Gernitz. Plate VI, figs. 25, 26, 27. 
LineuLa mytiLorpEs, J. Sowerby. (King) Bull. Soc. Géol. de Fr., 2™° série, vol. i, 
p- 30, 1844. 
— — 3 Geol. Russ., vol. i, p. 222, 1845. 
— — ps Tennant, Strat. List., p. 88, 1847. 
— — 5 King, Catalogue, p. 7, 1848. 
— — (Oy Howse, T. N. F. C., vol. i, p. 250, 1848. 
— CREDNERI, Geinitz. Versteinerungen, p. 11, pl. ii, figs, 23, 24, 1848. 
Dragnosis.—Shell thin; finely striated; oblong oval; rounded in front; with a 
median elevation (commencing at the posterior end, and becoming flattened anteriorly) 
from which the shell gradually slopes to the sides.* 
1 Gray, op. cit., p. 436. 
* Animaux sans Vertébres, t. vii, p. 386, 1836. 
3 «Die dine, mit feinmen Zuwachstreifen verzierte Schale ist linglich oval, untengerundet und lasst 
eine mittlere wulstformige Erhebung erkennen, die an dem kleinen Wirbel beginnt und sich nach unten hin 
verflacht und von welcher die Schale nach beiden Seiten hin abfallt.—Bei 10 Millimeter lange, 6-7 Millemeter 
breit.”’ (Geinitz, Versteinerungen, p. 11.) 
