134 GLYCIMERID&. 
FAMILY—GLYCIMERID. 
Animal symmetrical, oblong. Mantle lobes united and thickened in 
front ; siphons large, elongated, often invested with a thick wrinkled 
epidermis, united nearly to their ends, the orifices fringed; pedal 
opening small. Gills two on each side, narrow, unequal, united behind, 
and extending into the branchial siphon. Foot small, digitiform, 
inferior, furnished with a byssal groove. Shell equivalve, thick, gaping 
at both ends ; hinge with a rudimentary cardinal tooth ; ligament exter- 
nal, solid and prominent, placed upon a more or less strong callosity ; 
pallial impression irregular, sinuated behind. 
Genus, SAXICAVA—Bellevue. 
Palpi small, free ; siphons large, united nearly to their ends ; orifices 
fringed. Shell oblong, irregular, generally equivalve, inequilateral, 
slightly gaping at both ends; hinge linear, without teeth or with a rudi- 
mentary one on each valve; ligament external; pallial line sinuated, 
not continuous. 
S. australis, Zamark, Anim. sans vert., v., p. 1533; Reeve, Conch. 
Le., f. 8; S. distorta, Say; Hiatella minuta, Gray in Dieff. N.Z., 1u., p. 
252. Shell oblong, very rugose, more or less distorted ; umboes large, 
much elevated, nearly terminal; posterior side obliquely produced, 
angular, obsoletely spinose at the angle ; ventral margin sloped upwards 
at the end; terminal margin opliquely truncated ; dorsal margin straight, 
with a flattened area (Sowerby.) 
Auckland to Dunedin. Australia. Tasmania. America. 
This shell is said by Sowerby to be more tumid, especially towards 
the umboes than S. avcfzca, with which it has generally been con- 
founded. 
Genus, PANOPA— Menard. 
Siphons large, united nearly as far as their extremities, and invested 
with a thick wrinkled epidermis. Shell equivaive, inequilateral, gaping 
at each end, thick ; ligament external on prominent ridges, one promi- 
nent tooth in each valve ; pallial impression strong, with a more or less 
deep sinus. 
For notes on the anatomy of this genus, see Woodward in P.Z.S., 
OHS, ss 2 LSe 
P. zealandica, Quoy, Zc, 1, p. 547, pl. 83, f 7-9; Reeve 
Conch. Lc., f. 9. Oval, inequilateral, sub-compressed, widely gaping, 
longitudinally plicated ; umbones obtuse, recurved ; white. 
eight, cin; length or; breddthamn 1. (OF csGs) 
Sowerby says this species is from Queensland. 
Common in the North, rare in the South. Chatham Islands. 
Pesolandri. Gray, Dic. INZe i Ps 2155 5 -Lncede,. Conch alae 
6. Oblong, ventricose, rounded in front, rather narrower and truncated 
behind, smooth ; white ; much more ventricose than the last (Gray.) 
