276 FISSURELLID^. 



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. — Ciiemn. Conch, xi. 186, pi. 197, figs. 1927, 



1928. 

 Patella apertnra, Moxtagu, Test. Brit. 491, pi. 13, fig. 10. — 'Wood, Index, pi. 38, fig. 89. 

 Patella Jissun-lla, Muller, Zool. Dan. i. t. 24, figs. 4-G. — Gjielin, Syst. 3728, No. 193. 

 FissureUa Noachina, Lyell, Obs. sur Ic Soulevemcnt dc la Suede, No. 16, pi. 2, figs, 13, 



14, — Lam. An. sans Vert. vii. C04. — Sowerby, Conch. Illustr. {FissureUa), 



fig. 15. 

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

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

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

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



Cemoria Noachina, Gocld, Inv. 1st cd. 156, fig. 18. — Stimpson, Check Lists, 4. 

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



Shell bluish-white, conical, its summit pointed and turned back- 

 wards, and the surface covered with about twenty-two ribs, with 

 intervening smaller ones, and wrinkled by the lines of 

 ^'° "^ '■ growth. A narrow, diamond-shaped slit is presented at 

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

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

 Jh ^^ as it were arched over l)y a thin plate of the shell, when 

 ^^ viewed within ; edge oval and scalloped by the ribs. 

 c. Noachi- Length, one fifth of an inch: l)readth, one eighth of an 

 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 undoubtedly has 

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

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

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

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

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

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

 more than the young of FissureUa Grceca. But his figure repre- 

 sents this shell. 



