38 
marked with chestnut, red, or white. The interior is whitish and 
brown, the exterior being smooth, and the extreme length of the 
shell about an inch. The markings of the hinge and teeth are 
similar to those of the Glycymeris laticostata. 
CARDITA AVICULINA (Plate IX.).—Fig. 5 (late Mytili- 
cardia excavata) is an irregular-shaped white shell, with yellow, 
pink, or dirty brown markings. The longitudinal grooves on the 
outside are very rugged and deep. The shell is over an inch in 
length, and is found in both Islands and in Australia. 
RHYNCHONELLA NIGRICANS (Plate IX.).—Fig. 6 is an 
irregular-shaped, ribbed, black or dark brown shell, the left valve 
being much more rounded than the other. It is found up to one 
and a-quarter inches in breadth in the South Island and in the Bay 
of Plenty. 
TEREBRATELLA SANGUINEA (Plate IX.).—Fig. 7 (late 
Terebratella cruenta) is an orange-red, evenly ribbed, shell up to 
one and three-quarter inches in breadth, found in the South 
Island. The left valve in this shell is nearly flat. 
TEREBRATELLA RUBICGUNDA (not shown on plate) is a 
smooth, pink, or dark red shell, of the same shape, but only half 
the size, of the Telebratella sanguinea, and found in considerable 
numbers in both Islands amongst stones. It is particularly 
plentiful amongst the stones on Rangitoto Island, in Auckland 
Harbour. 
MAGELLANIA LENTICULARIS (late Waldheimia lenti- 
cularis) is not shown in the plate, but is a large, smooth, red or 
brown shell, two inches long, similar in shape to the above. All 
the above four shells, namely, the Rhynchonella, Terebratella (2), 
and Magellania, belong to the Terebratula family, and the right 
valve is longer than the left, and there is a small round orifice at 
the hinge end for the foot of the animal. On account of the resem- 
blance these shells bear to the old Roman lamp, they are known as 
Lamp shells. 
LITHOPHAGO TRUNCATA (Plate IX.).—Fig. 8 (late 
Lithodomus truncatus) is a thin brown shell, covered with a black 
