86 
BRACHIOPODA. 
Magas, Sow. Min. Conch. 1816, t. 119. 
Terebratula, § C, Blainv. Diet. Sci. Nat. liii. 145, 1828. 
Terebratulidee, § 2, Gray, Ann. ^ May. Nat. Hist. 1848, ii. 435. 
Wiegm. Arch. 1849, 98. 
Lovm, Arsb. 1848 and 1849, 213, & p. 8. 
Terebratulidae, part., et Magasidee, part., D’Orb. Ann. Sci. Nat. 
1847. 
Terebratula, Retzius, Gen. 
Mr. James Sowerby the elder gives a “ partial longitudinal 
septum with appendages attached to the hinge within,” as the 
character of the genus Magas, which is that of the whole tribe. 
He first pointed out the advantage of studying the internal ap- 
paratus, and observed in 1816, “ It is much to be washed that 
some person w'ould publish an account of the curious internal 
appendages of these shells.” — Mineral Conch, t. 119. 
M. de |Blainville in 1828 (Diet. Sci. Nat. liii. 145) used the 
form of the internal apparatus to divide the Terebratulee into six 
divisions. Section A. “ Gripus, Megerle” = Terebratulinina. 
B. = Terebratella. C. = Terebratulinina. D. = Megerlia. 
E. = Bouchardia. F. = Argiope. 
The genera into w'hich the Magasina have been divided depend 
chiefly on modifications of the internal skeleton ; these do not 
always correspond with the peculiarities of external form, or the 
character of the foramen and deltidium. 
4. TEREBRATELLA. 
Loop elongated, reflected, doubly attached ; — to the hinge- 
plate, and also to the longitudinal septum by processes given 
off at right angles from the crura, near the centre of the valve. 
Terebratella (chilensis), D’Orb. 1848, Ann. Sc. Nat. viii. 67- 
King, 1849, Permian Fossils, 81, 144. 
Dav. 1852, Ann. Nat. Hist. p. 366; Mon. Cret. p. 24. 
Terebratulae loricatae, Buch, 1834, iiber Terebrateln. 
Quenstedt, Handb. p. 463. 
Terebratida (dorsata), Retzius. 
Terebratella (dorsata), D’Orbigny, Paleont. Frang. 
Delthyris (dorsata), Menke, Syn. ed. 2. p. 96. 
