86 BEACHIOPODA. 



margins sinuated in front ; dorsal valve with a central, longitudinal 

 furrow ; beak rather produced, blunt ; foramen large, nearly complete ; 

 deltidia large, separate ; loop elongated, doubly attached. Length, 1 ; 

 breadth, '9 ; height, '4, 

 Dusky Bay, 



MAGAS. 



Shell with a reflected loop attached near the bend to a very 

 prominent central septum. 

 Santa Cruz. Australia. 



* 4. M. evansii, Davidson, Ann. Nat. Hist., 1852, p. 368. Sub- 

 ovate, with a few unequal bifurcating ribs ; pale red ; beak tapering, 

 slightly recurved, with well-defined lateral ridges ; foramen incomplete ; 

 deltidia small ; area flattened ; dorsal valve rather flat ; loop elongated, 

 doubly attached ; septum produced, nearly touching the opposite 

 valve. Length, '33 ; breadth, '3 ; height, '13. 



5. M. CUmingii, Davidson, Ann. Nut. Hist., 1852, p. 368. 

 Oval, thick, smooth, white, slightly tinged with red ; beak produced, 

 tapering, slightly curved, grooved to the summit ; area triangular, 

 concave ; deltidium obsolete ; dorsal valve with a prominent muscular 

 fulcrum ; loop doubly attached ; septum elevated, reaching the ventral 

 valve. Length, 1 ; breadth, '7 ; height, '4. 



Common. Chatham Islands. Australia. 



WALTONIA. 



Oval, smooth, punctate; valves convex; margins sinuated; beak 

 truncated by a large incomplete foramen ; deltidia separate ; loop 

 reduced to two simple lamelke, furnished with oral processes, and 

 attached to a prominent central septum. % 



New Zealand only. Only one minute specimen is known in the 

 Paris Museum, and in it the loop may possibly have been broken 

 away ; if so it should be referred to Terebratella. 



* 6. W. Valendenni, Davidson, Ann. Nat. Hist., 1852,^. 370. 

 Small, oval, red, smooth, with the margin fimbriated, the plaits radi- 

 ating in front, diverging at the sides ; dorsal valve nearly flat ; ventral 

 valve convex; beak prominent; foramen large and incomplete; deltidia 

 disunited. Length, - 2 ; breadth, '17 ; height, - 1. 



Probably the same as Mayas evansii. 



KRAUSSIA. 



Sub-circular, with a nearly straight hinge line ; beak truncated ; 

 foramen large and round ; deltidia small, disunited ; beak laterally 

 keeled ; hinge area flat ; dorsal valve longitudinally depressed ; internal 

 skeleton consisting of a small forked process arising from the septum, 

 near the centre of the valve. 



Cape of Good Hope. Australia. 



* 7. K. lamarkiana, Davidson, Ann. Nat. Hist., 1852, p. 370. 

 Sub-orbicular, striated with fine bifurcating ridges, light yellow ; hinge 



