374 MOLLUSCA. 
SHELL thin, whitish, a little clouded, short elliptical; apex central, 
erect, lines of growth distant and prominent, barred by about eighteen 
principal compressed ribs, having usually three smaller ones in the 
intervening spaces, producing a finely clathrate substance. Interior 
whitish, muscular impression faint; margin slightly crenulate ; fissure 
shallow, prolonged by a conspicuous lanceolate canal. 
Length five-eighths of an inch; breadth four-eighths; height three- 
eighths of an inch. 
Inhabits the Feejee Islands. 
Similar to the preceding, but far less solid, and much more regu- 
larly and delicately cross-barred; and if the size of the notch, the 
development of its canal, and the depth of the muscular impression, 
are important characters, these are certainly distinct species. 
Figures 494, 494 a, 4946, three views of the shell; 494 c, details of 
sculpture, enlarged. 
EMARGINOLA FUNGINA (Gould). 
Testa parva, solidula, elliptica, cinereo-virens ; costis radiantibus, par- 
vulis, quarta quaque majort, rotundatis ; apice mediano, erecto : intus 
viridula, cicatrice musculari intrinsecus atri-limbata ; margine sma- 
ragdino, eleganter crenulato : incisura lata, modicé profunda, intus in 
canalem ad verticem producta. 
Emarginula fungina, Gouin; Proceed. Boston Soc. Nat. Hist., ii. 
154. August, 1846. Expedition Shells, 12, 
SHELL regularly oval, rather solid, of an ashy-green colour ; apex cen- 
tral, erect; surface ornamented with small, rounded ribs, about twelve 
of which are larger than the rest, having usually three smaller ones in 
the intervening spaces. Interior greenish, the muscular impression 
having its inner margin edged with pitchy-black. Margin regularly 
and deeply crenulated, and deeper green. Notch broad and deep, 
having a short, shallow channel within, terminating at the muscular 
impression. 
