CORBULIDA, 135 
FAMILY—CORBULID~. 
Body not symmetrical. Palpi, long, narrow, pectinated on both 
sides. Mantle closed, except anteriorly; pedal orifice small, the 
margins dentate ; siphons short, united, the orifices fringed with cirri, 
the anal furnished with a tubercular, membranous, retractile valve. 
Gills two on each side, dependent, separate, moderately prolonged. 
Foot long, sub-cylindrical, furnished with a byssal groove. Shell porcel- 
lanous ; valves unequal, closed posteriorly ; hinge with a conical tooth 
and a cartilage pit in each valve.  Pallial line slightly sinuated. 
Genus, CORBULA-—-Bruguiere. 
Shell inequilateral, gibbous, rounded in front and produced _pos- 
teriorly ; ligament internal; pallial sinus slight; pedal scars distinct 
from the adductors. 
C. zealandica, Quoy, Zc., iii., ~. 511, pl. 85, f 12-14; C. catlowe, 
Reeve, Conch. Ic, f- 21. Small ovato-trigonal, swollen behind, finely 
longitudinally striated ; yellowish or pinkish white ; interior brownish, 
margin brown. 
Height, -3 ; length, -5 ; breadth, ‘25. (Quoy.) 
Common in the north. Found also in Australia. 
Reeve says that his C. cad/owe differs from C. zealandica in that ‘it 
is not striated, nor does the anterior side present the tellina-like 
flexuosity of that species.” 
C. erythrodon, Lamark,*Anim. sans vert., vi., p. 138; Reeve, 
Conch. Ic., f. 4. Shell ovate, nearly equivalve, anterior side the more 
produced, and angularly carinated; longitudinally grooved, pale, 
interior stained round the edge with red or pinkish-purple (Reeve.) 
China. Japan. 
Neither this species, nor the last, are found in the South Island. 
Cyadusta, ids P27.S., 1844, +p. 265, Reeve, Conch. e,. 7-230: 
Shell somewhat obliquely triangular, smooth, rather swollen, rounded 
posteriorly, slightly angulately accuminated anteriorly ; reddish-brown, 
covered with a horny epidermis ; umbones eroded (Rgeve.) 
New Zealand. (Cuming.) 
C. haastiana, Hutton, Jour de Conch, 1871, p. 84. Sub-trigonal, 
very inequivalve, covered with a brown epidermis ; rounded posteriorly, 
obsoletely keeled anteriorly ; right valve very finely striated; the left 
deeply grooved ; ventral margin sinuated anteriorly ; yellowish-white. 
Height, :4; length, 4. 
Lyttelton. 
FAMILY—ANATINID‘. 
Mantle margins united. Siphons elongate, generally more or less 
separate, the orifices fringed. Mantle with a small valvular aperture 
under the siphons. Gills pinnate, apparently one on each side, the 
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