276 FISSURELLTDiE. 



Cemoria Noachina. 



Fig. 18. 



Shell small, white, conical, covered with unequal, radiating ribs ; apex curved 

 forwards, and perforated obliquely backwards. 



Patella Noachina, Lin. Mantissa, 551. — Chemn. Conch, xi. 186, pi. 197, figs. 1927, 



1928. 

 Patella apertura, Montagu, Test. Brit. 491, pi. 13, fig. 10. — Wood, Index, pi. 38, fig. 89. 

 Patella Jissurtlla, Muller, Zool. Dan. i. t. 24, figs. 4-6. — Gmelin, Syst. 3728, No. 193. 

 Fissurella Noachina, Lyell, Obs. sin- le Soulevemcnt dc la Snodc, No. 16, pi. 2, figs. 13, 



14_. — Lam. An. sans Vert. vii. 604. — Sowekuy, Couch. lUiistr. [Fissurella), 



fig. 15. 

 Puncturella Noachina, Lowe, Zool. Journ. iii. 77. 

 Cemoria Flemingii, Leach; Sowerby, Conch. Man. fig. 244. 

 Sipho striata, Brown, Conch, of Great Brit. &c. pi. 36, figs. 14- 16. 

 Diodora Noachina, Stimpson, Shells of New England, 30. 



Cemoria Noachina, Gould, Inv. 1st ed. 156, fig. 18. — Stimpson, Check Lists, 4. 

 Cemoria princeps, Mighels and Adams, Bost. Journ. iv. 42, pi. 4, fig. 3. 



Shell bluisli-wliite, conical, its summit pointed and turned back- 

 wards, and the surface covered with about twenty-t\vo ribs, with 

 intervening smaller ones, and wrinkled by the lines of 

 growth. A narrow, diamond-shaped slit is presented at 

 the summit, wdiich opens in the interior by a circular aper- 

 ture, towards the margin, the course of this canal being 

 tXi M\^ as it were arched over by a thin plate of the shell, when 

 viewed within ; edge oval and scalloped by the ribs. 

 c.Noachi- Length, one fifth of an inch; breadth, one eighth of an 



na. o ^ 7 7 o 



inch ; height, one tenth of an inch. 



This curious little shell, the only recent species of its genus 

 known, is frequently taken from the stomachs of fishes. It is also 

 an inhabitant of the northern seas of Europe, and is found in a 

 fossil state also. 



Cape Cod, northward {Stimpson'). 



It has been arranged under different genera, but undoul)tedly has 

 claims to be the type of a distinct genus. Besides those mentioned 

 above, the genus Rimula of Defrance, would also probably embrace 

 it. But Cemoria has the priority over all those Avhich have been 

 constructed, though any one of the others would seem to have been 

 better chosen names. Lowe remarks, that the P. apertura of Mon- 

 tagu has been ascertained, almost beyond a doubt, to be nothing 

 more than the young of Fissurella Grccca. But liis figure repre- 

 sents this shell. 



