RHYNCHONELLA.—Prate I. 
than of the Boreal Seas; only the discovery of a few 
stragglers on our northern shores brings it into the British 
Fauna; and Dr. Gould, in his ‘ Report of the Invertebrata 
of Massachusetts,’ describes having never met with but a 
single specimen, transported in the stomach of an errant 
cod. 
Species 3. (Mus. Brit.) 
RHYNCHONELLA Grayt. hyn, testd trigono-ovatd, de- 
pressiusculd, olivaceo-corned, levigatd, prope marginem 
acute undato-plicatd, rostro attenuato-incurvo, fora- 
mine minuto, tubulari, deltidio integro; valvis suba- 
qualiter convewis. 
Gray’s RuYNCHONELLA. Shell triangularly ovate, rather 
depressed, olive-horny, smooth, sharply zigzag-plaited 
near the margin, beak attenuately incurved, foramen 
minute, tubular, deltidium entire; valves nearly 
equally convex. 
Woopwarp, Ann. and Mag. Nat. Hist. 1855, pl. 10. 
f. 16 a, 4, e. 
Hab. Feejee Islands; Macgillivray. 
A very distinct species, of a pale olive-horn-colour, in 
which the foramen is minute and tubular, the deltidium 
being consequently entire, and in which the margins are 
sharply zigzag-plaited. This zigzag plication of the mar- — 
gin is not uncommon in fossil species. 
