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 MoLlN.v. 1 782. Saggio sulla sloria naturale del Chili, p. 200, 34S. * 



— porosus Valenciennes. 1S46. Voyage de la Frégate »Vénus'. Zoophytes. PI. III. Fig. 2, 2 a. 



PI. IV. 

 ? — ervthrogrammus V.\LENCIEN'NE3. 1S46. Voyage de la Frégate »Venus'. Zo.^phytes. PI. VII, 



— albus L. Agassiz & Desor. 1S46. Catalogue rais. d. Echinides, p. 36S. 

 Heliocidaris erytlirogramma L. Agassiz & Desor. 1S46. Catalogue rais. d. Echinides, p. 371. 

 Echinus albus BLANCHARD. 1854. In Gay, Historia fis. y pol. de Chile. Zoologia. VIII. p. 417. 

 Heliocidaris erythrogramma BLANCHARD. 1854. In G.iy, Historia fis. y pol. de Chile. Zoologia. VIIl. ]i. 420. 

 Loxechinus albus Desor. 1858. Synopsis des Echinides fossiles, p. 136. 



— — DujARDlN & Hupe. 1S62. Hist. nat. des Zoophytes Échinodermes. p. 535. 

 Strong\loccntrotus albus A. .'AGASSIZ. 1S72. Revision of Ech., p. 162, 43S. 



— gibbosns A. Agassiz. 1881. »Challenger» Echinoidea, p. 106. 



— btillatus F. JEFFR. Bell. 1881. Echinoderniata. Account of the Zool. Coll. of H. M. S. 



»Alert» in the Straits of M.agellan and on the Coast of Patagonia. IX. P. Z. S., 

 p. 88. PI. VIII 1—2. 



— sp. inc. F. Jei'FR. Bell. 18S1. Ibidem, p. 89. PI. VIII. Figs. 3—4. 



— albus F. Jeffr. Bell. 1881. Observations on the Characters of the Echinoidea. IV. The 



Echinonietridx. P. Z. S., p. 415. 426. 



— bullatus F. Jeffr. Bell. 18S1. liiidem, p. 415, 426. 



— albus M. Meissner. 1896. Die von Herrn P)r. Plate aus Chile heimgebrachten Seeigel. 



Arch. f. Naturgesch. 62. I, p. 86. 



— — M. Meissner. 1900. Echiniden. Hamburger Magalhaens. Sammelreise, p. 9. 



— bullatus M. Meissner. 1900. Echiniden. Hamburger M.agalhaens. Sammelreise, p. 8. 

 Loxechinus albus Tu. Mortensen. 1903. »Ingolf» Echinoidea I, p. 122. 134. PI. XVII, Figs. 5, 18. 



— bullatus — — — — p. 134. 



— giblwsus — — — — p. 134. 178. PL 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, wliich is an old, 

 dried test, preserved in the Museum of Copenhagen (the specimen represented in 

 PI. VI, Figs. 3-4, 6). 



* In Revision of Echini p. 162 .\gassiz quotes this reference under p. 175, which is from the French 

 translation of Molin.\'s work. 



