CONCHIFERA. 753 
Panopea Min. LA Gr. Shell transverse, obtusely rotundate 
at both ends, longer posteriorly. Hinge callous, with accessory 
tooth in each valve. Impression of mantle excised posteriorly by a 
sinus. 
Sp. Panopwa Aldrovandi Ménanv, Mya glycimeris GMEL., CHEMN. Conchy!. 
Pl. 3, fig. 25, DusH. Conch. Pl. 7, fig. 1; in the Medit. Sea. A few other 
living species of this genus are known; they are large bivalves that in 
some degree resemble Mya. The fossil species occur in the chalk-formation 
and more numerously in the tertiary, to which Panopea Faujasii MENARD 
belongs, according to DESHAYES merely a variety of Pan, Aldrovandi. 
Comp. Ménarp DE LA Grove Ann. du Mus. 1x. 1807, pp. 131—136, 
Pl. rx. and VaLENnorennes Archives du Mus. 1. 1839, pp. 1—33, Pl. 1—6. 
Family XXI. Solenacea. Mantle sacciform, open anteriorly, 
with foramen for transmitting foot which is large, mostly truncated 
at the apex, or terminated by a broad disc. ‘Trachese very often 
conjoined. Shell equivalve, transverse, elongate, gaping at both 
ends. Ligament external. Muscular impressions remote. 
Solen L. (exclusive of Anatina). Shell inequilateral, longer 
posteriorly. Hinge with small teeth, two in left valve, one in 
right received between the opposite teeth, or with single tooth in 
each valve. Ligament elongate, often protuberant. 
Comp. L. SrenGcLER Skrivter af Naturh. Selskabet. Kjobenhavn, 1793, 
III. 2, pp. 81—tr14. 
Solecurtus Buainv. (in part), Desu. Shell oval, rotundate at 
both ends, subequilateral. Ligament large. Animal (Hypogea 
Pout) larger than shell, with foot large, lingulate. Trachee 
long, conjoined at base into a wide pipe. 
Sp. Solen strigilatus L., Pour Test. utr. Sic. 1. Tab. 12, 13, Buatnv. Malac. 
Pl. 79, fig. 4; in the Mediterranean. The fossil bivalve from the tertiary 
formation, referred by LAMAROK to Solecurtus strigulatus (figured Ann. du 
Mus. xt. Pl. 43, fig. 5) is, according to DESHAYES, a distinct species, Sole- 
curtus Lamarckit. 
Solen DeEsu. Shell transverse, often very long, with hinge 
sometimes almost terminal anterior. Ligament elongate. Animal 
(Hypogea Pout) with two short tracheze coalesced in most, in 
some separate, with foot cylindrical, truncated. 
Razor-shell, Manches de Couteau, &c. The ancient names Solen, Aulos, 
Donax (Puintus Hist. nat. Lib. XxxiI. cap. 11), already indicate the most 
common form of these shells. They hide in perpendicular holes in the 
sands of the beach, whilst the tubes are turned upwards. Some species are 
edible, and are much esteemed hy the Italians, as Solen siliqua, according 
VOR. -1s 48 
