104 
BRACHIOPODA. 
Megathyris oblita, D’Orb. 1852, Prod. iii. p. 134. 
Hab. Mediterranean, on corals, at 60-105 fathoms. 
Fossil. Miocene, Turin ; Gibraltar ; Malta. 
Terebratula irregularis, Blainv. D. S. N. liii. 140= ? Terebratula 
ostracea, Blainv. D. S. N. liii. 146, is perhaps a variety. 
** Loop trebly attacked. Ismenia. 
2. Megerlia pulchella. 
Shell oval, pointed at the beak, smooth, whitish, with a few 
radiating red lines ; margins rather flexuous ; foramen large, in- 
complete ; deltidia small, separate ; area indistinct ; dorsal valve 
flattened ; loop small, trebly attached. Lon. 3, lat. 2, alt. 1 
line. 
Terebratula pulchella, G. Sowerby, Tkes. Conch, vii. p. 360. pi. 71 ■ 
f. 105-107. 
Megerlia pulchella, Dav. Ann. Nat. Hist. 1852, p. 369. 
Hab. Philippines; Cocos Island. 
3. Megerlia pectunculus. B.M. 
Shell pentagonal, with seven corresponding ribs to each valve ; 
ribs unequal, projecting beyond the margin, four large and three 
intermediate smaller ; both ribs and interspaces ornamented with 
regular squamose lines of growth ; margins even ; beak short, 
truncated by a large foramen ; deltidium incomplete ; loop small, 
trebly attached. Lon. 6, lat. 7, alt. 4 lines. 
Terebratulites pectunculus, Schlotheim, 1820, p. 272. 
Terebratula pectunculus. Buck, Mem. Soc. Ge'ol. Fr. iii. p. 188. 
pi. 17. f. 1*. 
Quenst. Handb. p. 466. t. 37. f. 23, 25. 
Terebratella pectunculus, D’Orb. Prod. i. p. 377- 
Ismenia pectunculus. King, Permian Foss. 81 . 142. 
Fossil. Oxford Clay. France. 
Coral Rag. Bavaria ; Wurtemburg. 
4. Megerlia lima. B.M. 
Shell orbicular or slightly pentagonal, smooth, or minutely 
granulated ; dorsal valve nearly flat ; ventral deeply convex ; 
beak short, recurved ; foramen moderate ; deltidium rudimentaiy, 
concealed ; loop rather long, attached to the median septum by 
crural processes and also by processes from the reflected and ex- 
panded termination. Lon. 9, lat. 6, alt. 5 lines. 
