GASTEROPODA. 373 
EMARGINULA OSSEA (Gould). 
Testa crassa, rudis, albida, oblongo-elliptica, costis, radiantibus nume- 
rosis inequalibus acutis, et striis incrementi decussata; bast arcuato, 
margine crenulato ; cicatrice musculart bené impressd: incisura haud 
profunda, intus viz in canalem producta. 
Emarginula ossea, GOULn ; Proceed. Boston Soc. Nat. Hist., 1. 155. 
August, 1846. Expedition Shells, 12. 
Suet solid, rugged, white, sub-quadrate, rounded at angles; apex 
central, obtuse; stricee of growth coarse, barred by numerous highly 
raised, rude, compressed ribs, of which about twelve (some double) 
are larger than the rest. Muscular impression very deep; margin 
coarsely crenulated. Fissure deep, abrupt; scarcely prolonged by a 
channel. 
Length six-tenths of an inch; breadth nine-twentieths of an inch; 
height three-tenths of an inch. 
Inhabits the Feejee Islands. 
It is allied to E. australis, Quoy, but is much smaller and less 
deeply chequered. 
Figures 492, 492a, 492, dorsal, interior, and profile views of the 
shell; 492 c, details of sculpture, enlarged. 
-EmarGInuta CINEREA (Gould). 
Testa cinerea, EE. osseo similis, sed tenwior, altior, magis disposité et 
delicate clathrata: cicatrice musculari inconspicua: incisura minimé 
profunda, in canalem interiorem valde insignem producta. 
Emarginula cinerea, Gou.p; Proceed. Boston Soc. Nat. Hist., i. 
155. August 1846. Expedition Shells, 13. 
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