1 1 



'^Spirialis' retrover sus is coiled to the right, while Boas figured ^) that of "■ Limacina' reticulata 

 as a right-handed spiral. Pelseneer corrected ') this, but he sa\s abcnit tlie operculum of 

 Limacina that it exhibits a right-coiled direction ^). 



In reality the opcrcuhim of Pcraclis is left-coiled, as it has been represented by d'Orhignv, 

 long before Souleyet. 



Pelseneer stated ') afterwards that the opercuhnn ol Limacina retrovei'sa was left-handed, 

 a fact which, after my own researches, holds good in the three species of the Siboga-material 

 too. The opercuhim of Limacina inflata is figured PI. I, tig. i. In the two other species it 

 shows a more elongated shape. 



In Peraclis the opercuhnn exhibits the same left-handed direction. 



The beginning of its spiral is turned to the umbilicus (false spira). 



Limacina Cuvier. 



1817. Limacina Cuvier, Le Règne animal, t. II, p. 380. 



1823. Hetcrofiisiis Fleming, On a reversed species of Fusiis, Mém. Wern. Soc, p. 498. 



1824. Spiratella de Blainville, Dict. d. Sci. Nat., t. XXXII, p. 284. 



1836. Heliconoides (part.) d'Orbigny, Voyage d. I'Amér. mér., t. V, p. 174. 

 1840. Spirialis (part.) Eydoux et Souleyet, in: Revue Zool., t. III, p. 235. 

 1842. Helicophora Gray, Synopsis of the contents of the British Museum, p. 59. 

 1844. Scaea Philippi, Fauna Molluscorum utriusque Siciliae, p. 164. 

 1861. Protomedea (part.) Costa, Microdoride mediterranea, p. J^. 



1869. Enibolus Jefifreys, British conchology, vol. V, p. 114. 

 1885. Limacina (part.) Boas, Spolia atlantica, p. 39. 



I. Limacina iiijlata (d'Orbigny). 



1836. Atlanta inflata d'Orbigny, Voyage dans FAmérique meridionale, vol. V, p. 174, pi. 12, 



figs. 16 — 19. 

 1840. Spirialis r ostralis Eydoux et Souleyet, Description sommaire de plusieurs Ptéropodes 



nouveaux ou imparfaitement connus, Revue Zoölogique, vol. 3, p. 236. 

 1850. Limacina inflata Gray, Catalogue of the Mollusca in the collection of the British Mus., 



Prt. II, Pteropoda p. 31. 

 1852. Limacina scaphoidea Gould, The Mollusca and Shells of the U. S. Exploring Expedition, 



p. 485, pi. 51, fig. 602. 

 1861. Protomedea elata O. G. Costa, Microdoride mediterranea, p. 74, pi. 11. fig. 5. 



1870. Evibolns r ostralis Jeffreys, Mediterranean Mollusca, Ann. and Mag. Nat. Hist., ser. 4, 



vol. 6, p. 86. 

 1882. Protomedea r ostralis Fischer, Sur le faune Malacologique abyssale de la méditerranée, 



Comptes rendus, vol. XCIV, p. 120. 

 1889. Embolus inflatus Dall, in: Bullet. U. S. Nat. Mus., n" ij , p. 80. 



Living animals: 



Stat. 35. 8° o'.3 S., iió°59'E. i spec. 



Stat. 66. Betvveen Bahuluwang a. Tambolungan, south of Saleyer. 2 spec. 



Stat. 95. 5°43'.5N., ii9°4o'E. Sulu Archipelago. 2 spec. 



1) Spolia atlantica, pi. III, fig. 39^. 



2) Chall. Rep. LXV, p. 33. 



3) Ibid., p. 16. 



4) Suv la dextrorsité de cei-tains Gastropodes dits "sénestres". Comptes rendus, iSgi, t. CXII, p. 1016. 



