TEREBRATULID&. Ly 
mented with radiating dichotomous ribs; orange-red, deepest at the 
lines of growth ; margins crenulated ; dorsal valve with a central, longi- 
tudinal depression ; beak somewhat produced, lateral ridges distinct ; 
area large, rounded ; foramen large, complete; deltidium large ; loop 
elongated, doubly attached. 
Length, 1°5 ; breadth, 1°6 ; height, r. 
Cook Strait to Stewart Island. 
T. rubicunda, Solander; T. sanguinea, Q. & G., Le. iii, p. 
On ea O53 f> 0-7; Reeve, Conch. Ie. f. ep T.  tnconspicua, 
Sow. Shell somewhat triangularly ovate, deep red, or colourless, pale 
towards the beak, beak tumidly produced, rather erect, foramen large, 
sometimes entire, sometimes with the deltidium divided ; valves gibbous, 
flexuousely channelled in the middle ; apophysis elongated, conspicu- 
ously doubly attached (Reeve). 
Common. Auckland Islands. Chatham Islands. 
Genus, MAGAS—Sowerby. 
Shell with a reflected loop attached near the bend to a very promi- 
nent central septum. 
M. evansii, Davidson, P.Z.S., 1852, p. 77, pl. xiv., f. 7-9. 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. 
Possibly the young of 7: cruenta. 
Genus, WALTONIA-—Davidson. 
Oval, smooth, punctate; valves convex; margins sinuated ; beak 
truncated by a large incomplete foramen; deltidia separate; loop 
reduced to two simple lamellz, 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 Zerebratedla. 
W. valencienni, Davidson, Ann. Nat. Hist., 1850, pl. 15, f. 1. 
Reeve, Conch, Ic., f: 31. Small, oval, red, smooth, with the margin 
fimbriated, the plaits radiating in front, diverging at the sides ; dorsal 
valve nearly flat; ventral valve convex; beak prominent; foramen 
large and incomplete; deltidia dis-united. 
Length, ‘2; breadth, ‘17 ; height, ‘1. 
Probably the same as AZagas evansiz. 
Genus, BOUCHARDIA—Davidson. 
Apophysary system anchor-shaped, consisting of an elevated central 
plate, to which are affixed two short lamelle. 
