CONCHIFERA. 
466 
Panopea Aldrovandi. — Aldrovandus’s Panopea. 
Plate XCI. fig. 8 and 9. 
Transversely elongated, undulated ; concentrically wrinkled ; 
of a yellow fawn-colour. Inhabits the Mediterranean. 
Genus 66. — SOLEN.— Linnaeus. 
Generic Character. —Equivalve, transversely elongated, gap¬ 
ing at both extremities ; beaks very small, always short; pri¬ 
mary teeth small, varying in number, sometimes none, and rare¬ 
ly a pit between them ; ligament external. 
There are three sections in this genus :—* Shells with a ter¬ 
minal hinge, and anteriorly truncated. ** Primary teeth some¬ 
what distant from the anterior margin. *** Hinge situated 
nearer the middle than the anterior end. 
Solen ensis. — The Sabre Solen. 
Plate XCI. fig. 11. 
Linear, sabre-shaped, somewhat reflected at the end next the 
hinge ; in each valve a single compressed tooth without laminae; 
olive-brown towards the base of the shell, and next the apex 
brownish-purple. From five to seven inches broad. Inhabits 
the seas of Europe. 
TRIBE III.-PHOLADARIA. 
Valves with accessory pieces; or gaping considerably ante¬ 
riorly. 
Genus 67. — GASTROCHCENA.— Spengler. 
Generic Character. —Equivalve, somewhat wedge-shaped; 
with a very large, oval, oblique, anterior opening betwixt the 
valves; hinge linear, marginal, and without teeth. 
Gastrochoena modiolina. — The Modioliform Gastrochiena. 
Plate XCI. fig. 16. 
Oval, thin, brittle, gaping at the side; of a light reddish- 
brown ; inside bluish-white. Three-fourths of an inch long. 
Inhabits the British coasts. 
