474 FISSURELLIDiK. 



and of which recent species have been found by Mr. 

 Cuming), but not correctly, for in the shells of that genus 

 there is no internal partition. 



P. Noachina, Linnaeus. 



Plate LXIL fig. 10, 1 1, 12, and (Animal) Plate B.B. fig. 4, 5, 6. 



Patella Noachina, Linn. Mantissa, p. 551. — Chemn. Conch. Cab. vol. xi. p. 186, 

 pi. 197, f. 1927, 1928.— Dillw. Recent Shells, vol. ii. 

 p. 1055. 

 „ fissurella, Muller, Zool. Danic. pi. 24, f. 5, 6. — Fabric. Fauna 

 Greenland, p. 384.— Gmelin, Syst. Nat. p. 3728. — Donov. 

 in Rees' Cyclop. Conch, pi. 1, bis (1811). ? 

 Fissurella NoacMna, Schumacher, Syst. Vers, Testae. (1817) p. 181. — Brit. 

 Marine Conch, p. 134, f. 178. — Sowerby, Conch. Illustr. 

 Fissurella, p. 5, f. 15. — Dish. Lam. Anim. s. Vert. vol. 

 vii. p. 604. 

 Pimcturella Noachina, Lowe, Zoolog. Journ. vol. iii. p. 78 (Jan. 1827). — Alder, 



Cat. Moll. Northumb. and Durh. p. 70. 

 Cemoria Flemingii, Leach (MSS. quoted by Lowe, Zool. Journ. vol. hi.). — 

 Sowerby, Conch. Manual, p. 244. 

 „ Noachina, Gould, Invert. Massach. p. 156, f. 18. — Dekay, New York 

 Fauna, Moll. p. 156, pi. 9, f. 195. — Searles Wood, Crag 

 Mollusca, p. 166, pi. 18, fig. 5 (fossil). 

 Rimula Flemingii, Macgil. Moll. Aberdeenshire, p. 178. 



„ Noachina, Couthouy, Boston Journ. N. H. vol. ii. p. 87< — Loven, 

 Index Moll. Scandinav. p. 21. 

 Sipho Noachina, Brown, Illust. Conch. G. B. p. 61, pi. 12, f. 14, 15, 16. 



The Patella Noachina of Linnoeus, first known to us as 

 a fossil, is a conical, subpellucid, and not very strong shell, 

 of an uniform white, both within and without, externally 

 rather dull, internally lustrous. It is laterally compressed, 

 yet a little inclined to spread at the base ; the front slope 

 is rather more abrupt than the hinder one, but both are 

 straightish, the former inclining, however, to the convex, 

 the latter to the concave. The vertex is either in the 

 middle or slightly precedes it ; it is recurved, acute, and 

 minutely and laterally subspiral. Just before it is a longi- 



