IANTHINA. 549 



found empty, while the central ones contain young- shells 

 fully formed, and those towards the animal are filled with 

 eggs. " It appears probable,"'' writes that observer, " that 

 the young animals, when liberated from their chambers, 

 ascend the float of the mother, and in this way gain access 

 to the surface and construct the elements of their future 

 support. 11 



I. communis, Lamarck. 



Broader than long, angulated at the circumference ; aperture 

 subtrapeziforin ; outer lip meeting the pillar at right angles. 



Plate LXIX. fig. 6, 7. 



He/iu ianthina, Linn, (not Brookes) Syst. Nat. ed. 12, p. 1246 (part only). — 



Brown, Mem. Werner. Soc. vol. ii. pt. ii. p. 525. — Turt. 



Conch. Diction, p. 58, f. 96. — Dillw. Recent Shells, vol. ii. p. 



938. 



lanthine, Cuvier, Ann. du Mus. vol. xi. (1808), pi. 1, f. 1 ; Animal, f. 2 to 8 



(? all). 

 Ianthina fragiUs, Lam .(not Dekay,) Syst. Anim. s. Vert. — Montkort, Conch. 

 Syst. (1810), vol. ii. p. 214. — Sowerby, Genera Shells, 

 Ianth. f. 1. — Swainson, Zool. Illust. ser. 1, pi. 85. — Sow- 

 ekbv, Manual Conch, f. 333. — D'Orbignv, Mol. Canar. 

 p. 83, Animal. — Broderip, Penny Cyclop, vol. xiii. p. 90, 

 and fig. at p. 89, animal. — Reeve, Conch. Syst. pi. 205, f. 1. 

 „ communis, Lam. Anim. s. Vert. (ed. Desh ) vol. ix. p. 4. — Fleming, 

 Brit. Anim. p. 324. — Brit. Mar. Conch, p. 151. — Brown, 

 Illust. Conch. G. B. p. 24, pi. 8, f. 1, 2.— Crouch, Introd. 

 Lam. Conch, pi. 16, f. 3. — Lesmjn, Voy. Coquille, p. 361, 

 pi. 8, f. 1 (probably). 

 Tanthine violelte, car. Blainv. Man. Malacol. pi. 37, bis, f. 1, a (not ]). 

 Ianthina bicolor, Philippi, Moll. Sicil. vol. i. p. 164 ; vol. ii. p. 142. — Costa, 



Test. Sicil. p. 112. 

 Encycl. Mt-th. Vers, pi. 456, f. 1 . 



In his earlier classification, Lamarck having termed the 

 Helix ianthina of Linnteus I.fragilis, without giving any de- 

 scription, has appended a synonymy to it, that fairly enough 

 agrees with that shell. In his "Animaux sins Vertebras," 



