CONCHIFERA. 
4G5 
CreneUa ellipticci. — The Oval Crenella. 
Plate XCI. fig. 13. 
Ovate, ventricose; with decussated striae; greenish-yellow, 
inside nacred, the margins crenulated. One-eighth of an inch 
long. Inhabits the coasts of Zetland and Argyle. 
Genus G3.—SPENIA.— Turton. 
Generic Character .—Transversely oblong-ovate ; slightly tor¬ 
tuous ; hinge without teeth, but with the cardinal margin flat¬ 
tened. 
Spenia Einghami .— Bingham’s Spenia. 
Plate XCI. fig. 14. 
Upper valve flat, much smaller than the under, which is 
convex, incurved at the extremity, and envelopes the smaller 
valve; covered with a reddish-brown epidermis; inside bluish- 
white. Half an inch broad. Inhabits the Devonshire coast. 
TRIBE II.-SOLENIDES. 
Shells transversely elongated, destitute of accessory pieces, 
and gaping at the lateral extremities only; ligament exterior. 
Genus 64.—GLYCIMERIS.— Lamarck. 
Generic Character. —Transverse, gaping widely at each extre¬ 
mity ; hinge callous, destitute of teeth ; ligament external. 
Glycimeris siliqua. — The Pod Glycimeris. 
Plate XCI. fig. 7. 
Transversely oblong; covered with a black epidermis ; um- 
bones decorticated; internal disk of the valves white, callous, 
and thick. Two inches and a half broad. Inhabits the North 
seas. 
Genus 65.—PANOPEA.— Lamarck. 
Generic Character. —Equivalve, transverse, gaping unequally 
at the sides; one conical primary tooth in one valve, and a com¬ 
pressed, short, ascending callosity on each side ; ligament exter¬ 
nal, affixed on the elongated side of the shell, over the callosities. 
