136 SAXICAVID. 
concentric lines; ligament and basal margins straight, parallel ; 
a spoon-shaped fosset in each valve, the lateral margins of which 
are carinated, and the base emarginated. §. subovata, Conr. 
Miocene; Virginia. 
Panop#A, Menard de la Groye, 1807. 
Etym.—Panopé, a Nereid. Syn.—Glycimeris, H. and A. Ad. 
Distr.—11 sp. Northern seas, Mediterranean, Cape, Australia, 
New Zealand, Patagonia. LLow-water—ninety fathoms. Fossil, 
140 sp. Inferior Oolite—; United States, Europe, India. 
Shell equivalve, thick, oblong g, gaping at each end; ligament 
external, on prominent ridges ; one prominent tooth in each valve ; 
pallial sinus deep. 
Animal with very long, united siphons, invested with thick, 
wrinkled epidermis; pedal orifice small, foot short, thick, and 
grooved below ; ills long and narrow, extending far into the 
branchial siphon, the outer pair much narrower than the i inner, 
faintly pectinated; palpi long, pointed, and striated. 
In P. Norvegica the pallial line is broken up into a few scat- 
tered spots, as in Saxicava; the animal itself is like a gigantic 
Saxicava. This species ranges from Ochotsk to the White Sea, 
Norway, and North Britain; it was formerly an inhabitant of 
the Mediterranean, where it now occurs fossil. (= P. Bivone, 
Philippi.) The British specimens have been caught, accidentally, 
by the deep-water fishing-hooks. P. Natalensis is found at Port 
Natal, buried in the sand at low-water; the projecting siphons 
first attracted attention (doubtless by the strong jets of water 
they sent up when molested), but the shells were only obtained 
by digging to the depth of several feet. The Mediterranean 
species P. glycimeris, attains a length of six or eight inches. 
GLYCIMERIS, Klein, 1753. (Panopzea, H. and A. Adams. 
Panomya, Gray.) Pallial line broken up into punctations, pos- 
terior impression much lengthened. Recent, miocene and plio- 
cene. P. glycimeris, Born (cvii, 29-31). 
Cyrtopart4, Daudin, 1799. 
Samal Lam., 1801. 
Distr.—2 sp. Arctic seas, Cape Parry, Northwestern America, 
Newfoundland. Fossil. Pliocene—; Britain , Belgium. C. siliqua, 
Chemn. (evi, 17; evii, 32). 
Shell oblong, gaping at each end; posterior side shortest ; 
ligament large and prominent; hinge thick, without teeth ; 
epidermis black, extending beyond the margins ; anterior mus- 
cular sear long, pallial impression irregular, slightly sinuated. 
Animal larger than its shell, subcylindrical; mantle closed, 
siphons united, protected by a thick envelope; orifices small ; 
pedal opening small, anterior; foot conical; palpi large, striated 
inside, the posterior border plain; gills large, extending into the 
branchial siphon, 
