BRACHIOYPODA. 36a 
! 
fathoms. ossil, 90 species. Carb—. South America, Europe. 
Hudesia (cardium), King, includes 1 recent and 6 fossil species 
which are sharply plaited. Z. impressa (Pl. XV., Fig. 5) is 
the type of a group which has the external shape of Terebratella. 
Meganteris, Suess, 1856. Terebratula Archiaci, Vern. Devo- 
nian, Asturias. Shell with a long, reflected, internal loop. 
TEREBRATELLA, D’Orbigny. 
Type, T. dorsata, Gmel. (= Magel- 
lanica, Chemn.) Pl. XV., Fig. 7. Fig. 151. 
Shell smooth or radiately plaited ; dorsal 
valve longitudinally impressed; hinge- 
line straight, or not much curved; beak 
with a flattened area on each side of the 
deltidium ; foramen large; deltidium in- 
complete; loop attached to the septum (s). 
Animal like Terebratula ; the spiral lobe 
of the brachial disk becomes very 
diminutive in some species, and is f 
obseletein Morrisiaand 7. Cumingii. 
Distribution, excluding sub-genera, 
25 species. Cape Horn, Valparaiso (> 
(90 fathoms), New Zealand, Japan, a 
Ochotsk, Spitzbergen, Labrador. 
Fossil, 16 species. Lias—. United Fig. 152. Ter. Hvansit, Dav. 
States, Europe. In Z. crenulata and Hvansit (Fig. 152) the 
dorsal septum sometimes projects so far as to touch the oppo- 
site valye, but in other examples it remains undeveloped. 
(Dayidson.) 
Sub-genera. Trigonosemus (elegans), Konig. Synonyms, Del- 
thyridzea (pectiniformis), M‘Coy.  Fissirostra, D’Orbigny. 
Example, T. Palissii, Pl, XV., Fig. 8. Shell finely plaited, 
beak prominent, curved, with a narrow apical foramen ; cardinal 
area large, triangular; deltidium solid, flat; cardinal process 
very prominent. Distribution, 5 species. Chalk, Europe. 
Lyra (Meadi), Cumberland, Min. Con. 1816. Pl. XV., Fig. 6. 
Synonyms, Terebrirostra, D’Orbigny. Rhynchora, Dalman.* 
* The name Riynchora was given by Dalman to the Ter. costata. Wahl. — T. 
pectinata, L.) on the supposition that it was identical with Sowerby’s 7. Lyra; and 
as no specimen could be found with a long beak, an artificial one was manufactured 
for it, of which there is a cast in the British Museum. The second species of “‘ Rhyn- 
chora,” Jer. spatulata, Wahl., has no beak whatever: in shape it is like an Argiope, 
but measures an inch each way. The ventral valve is a simple bent plate with the 
teeth at the angles ; the dorsal valve is flat, with a very wide hinge-plate, and sockets 
xt the angles, whilst a single septum projects from the centre, with portions of a loop 
ettacned, 
Vig. 151. Zerebratella. 
