52 
TH. MORTENSEN, 
(Schwed. Südpolar-Exp. 
separate species; but it seems that the time has not been long enough for trans- 
forming them to any high degree. (Cf. Echinoiden d. deutschen Südpolar-Exped., 
the chapter on the geographical distribution of the antarctic and subantarctic Echi- 
noids.) 
© 
Loxechinus albus (Mol.). 
PI. VI, Figs. 1—6. PI. VIII. PI. XVI, Figs. 2, 4—5, 14, 16—17. 
Echinus albus Molina. 1782. Saggio sulla storia naturale del Chili, p. 200, 34S. * 
— porosus Valenciennes. 1S46. Voyage de la Frégate »Vénus». Zoophytes. PI. Ill, Fig. 2, 2 a. 
PI. IV. 
? — erythrogrammus Valenciennes. 1846. Voyage de la Frégate »Vénus». Zoophytes. PI. VII. 
— ■ albus L. Agassiz & Desor. 1846. Catalogue rais. d. Échinides, p. 368. 
Heliocidaris erythrogramma L. Agassiz & Desor. 1846. Catalogue rais. d. Échinides, p. 371. 
Echinus albus Blanchard. 1854. In Gay, Historia fis. y pol. de Chile. Zoologia. VIII, p. 417. 
Heliocidaris erythrogramma Blanchard. 1854. In Gay, Historia fis. y pol. de Chile. Zoologia. VIII, p. 420. 
Loxechinus albus Desor. 1858. Synopsis des Échinides fossiles, p. 136. 
— — Dujardin & Hupé. 1S62. Hist. nat. des Zoophytes Échinodermes, p. 535. 
Strongylocentrotus albus A. Agassiz. 1872. Revision of Ech., p. 162, 438. 
— gibbosus A. Agassiz. 1881. »Challenger» Echinoidea, p. 106. 
bullatus F. Jeffr. Bell. 1881. Echinodermata. Account of the Zool. Coll, of H. M. S. 
»Alert» in the Straits of Magellan and on the Coast of Patagonia. IX. P. Z. S., 
p. 88. PI. VIII 1—2. 
sp. inc. F. Jeffr. Bell. 1881. Ibidem, p. 89. PI. VIII, Figs. 3 — 4. 
— albus F. Jeffr. Bell. 18S1. Observations on the Characters of the Echinoidea. IV. The 
Echinometridæ. P. Z. S., p. 415, 426. 
— bullatus F. Jeffr. Bell. 1881. Ibidem, p. 415, 426. 
albus M. Meissner. 1896. Die von Herrn Dr. Plate aus Chile heimgebrachten Seeigel. 
Arch. f. Naturgesch. 62. I, p. S6. 
— — M. Meissner. 1900. Echiniden. Hamburger Magalhaens. Sammelreise, p. 9. 
— bullatus M. Meissner. 1900. Echiniden. Hamburger Magalhaens. Sammelreise, p. 8. 
Loxechinus albus Th. Mortensen. 1903. »Ingolf» Echinoidea I, p. 122, 134. PI. XVII, Figs. 5, 18. 
— bullatus — — — — p. 134. 
— gibbosus — — — — p. 134, 178. PI. XVII, Fig. 12. 
For some other literary references, giving only the names, I may refer to the works of Meissner 
quoted above. 
In view of the great confusion which has reigned concerning this species it may 
not prove superfluous to give here a full description and figures, together with cor- 
rections of some previous indications. 
The measurements given here represent specimens taken by the Swedish South 
Polar Expedition (at Station 3), excepting the largest specimen, which is an old, 
dried test, preserved in the Museum of Copenhagen (the specimen represented in 
PL VI, Figs. 3—4, 6). 
* In Revision of Echini p. 162 Agassiz quotes this reference under p. 175, which is from the French 
translation of Molina’s work. 
