ijgi. Cavolina natans Abildgaard, Nyere Efterretning om det Skaldyr som Forskal har 



beskrevet under Navnet Aiwniia tridcntata, Skriv. Naturh. Selsk, Bd. I, Heft 2, 



p. 175, pi. X. 

 iSoi. Hyalaea cornea Lamarck, Système des anim. sans vert. p. 140. 

 1802. Hyalaea tridcntata Bosc, Hist. nat. des coq., vol. II, pi. X, fig. 4. 

 1804. Hyalaea papilionacea Bor\' de Saint- Vincent, Voyage dans les quatres principales iles 



des mers d'Afrique, vol. I, p. 137, pi. V, fig. i. 

 18 10. Hyale téniobranche Péron et Lesueur, Histoire de la familie des Mollusques Ptéropodes, 



Ann. Mus. Hist. Nat. Paris, vol. XV, pi. II, fig. 13. 

 18 13. Hyalaea peronii Lesueur, Mémoire sur quelques animaux Mollusques, etc, Nouv. Bullet. 



Soc. Philom., vol. III, p. 284. 

 1813. Hyalaea chemnitziana Lesueur, Ibid, p. 284. 



1816. Hyalaea australis Péron, Voyage de découvertes aux terres australes, vol. I, pi. XXXI, fig. 5. 

 1821. Hyalaea forskalii Lesueur in: DE Blainville, Dict. d. Sci. Nat., vol. XXII, p. 79. 

 1821. Hyalaea teniobranchia de Blainville, Ibid., p. 80. 

 1836. Hyalaea affinis d'Orbigny, Voyage dans l'Amérique meridionale, vol. V, p. 91, pi. V, 



figs. 6 — 10. 

 1848. Hyalaea truncata Krauss, Südafrikanische Mollusken, p. 34, pi. II, fig. 12. 

 1859. Cavolina telcmus A. Adams, On the Synonyms and Habitats of Caz'olinia, Diacria and 



Plenropiis, Ann. and Mag. Nat. Hist., ser. III, vol. 3, p. 44. 

 1877. Caiwlinia ciimingii Sowerby in: Reeve, Conchologica iconica, vol. XX, Pteropoda, 



pi. I, fig. 5. 

 1882. Cavolina tridentata Verrill, Catalogue of marine Mollusca added to the Fauna of New 



England during the past ten years, Transact. Conn. Acad. vol. V, prt. 2, p. 554, figs. 6 — 7. 

 1882. Cavoltma tridcntata Fischer, Manuel de Conchyliologie, p. 434. 



Living animals; 



Stat. iio. 4° 34' N., 122° o' E. I spec. 



Stat. 276. 6° 47'. 5 S., i28°4o'.5E. i spec. 



Empty shells: 



Stat. 45. 7° 24' S., 118° 15'. 2 E. I spec. 



Stat. 52. 9° 3'.4 S., 119° 56'. 7 E. 7 spec. 



Stat. 88. o°34'.6N., 119° 8'.5 E. 3 spec. 



Stat. 95. 5°43'.5 N., 119° 40' E. 3 spec. 



Stat. 100. 6° 11' N., i20°37'.5E. 2 spec. 



Stat. 116. o°58'.5N., i22°42'.5 E. i spec. 



Stat. 178. 2° 40' S., i28°37'.5E. 3 spec. 



Stat. 208. 5° 39' S., 122° 12' E. I spec. 



Stat. 211. 5° 40'. 7 S., I20°45'.5E. 5 spec. 



Stat. 221. 6° 24' S., 124° 39' E. 4 spec. 



Stat. 240. Banda. i spec. 



Cavolinia tridcntata occurs in the East-Indian Archipelago, but it is not so abundant as 

 nearly all the other species of Cavolinia (s. str.J. 



BoAS ') distinguished already two variaties which, huwever, are linked to the type by 

 gradual transitions. One of these varieties, the Hyalaea affinis of d'Orbigny was found at 

 station 116. It is an e.\treme form and, at first sight, it may be regarded as a Cavolmia 

 uncinata, with which Cavolinia tridentata is closely allied, but it is distinguished from this species 

 by the less pronounced dorsal ribs, by the oblique direction of the dorsal lip, the slight 



i) Spolia atlantica, p. 116 — 117. See his table 6, fig. 100. 



