26 



TH. MORTENSEN, 



(Schwed. Siidpolar-Exp. 



Arâacia Dufresnii. 



— aliirnans. 



— Dufresnii. 



— alin'ftatis. 



Afbacia 



Echinocidaris Scythci Philippi. 1857. Neue Echinodermen d. chilenischen Meeres. Arch. f. Naturgesch. 



1857. I. p. 13:. 

 Arbacia Dufresnii A. .\gassiz. 1872 — 74. Revision of Echini, p. 91, 399. 



— — — 1874. »Hassler» Echinoidea p. 6. PI. I. Figs. 3 — 4. 



Echinocidaris (Agarilcs) Dufresnii. Troschel. 1873. Die Familie der Echinocidariden. Arch. f. Naturgesch. 



XXXVIII p. 307. XXXIX. 1S74. p. 319. 

 alt;rnans. Troschel. 1873. Die Familie der Echinocidariden p. 307, II. p. 323. 

 Studer. 1876. Über Echinodermen a. d. antarktischen Meere und zwei neue Seeigel 

 von den P.apua-Inseln, gesammelt a. d. Reise S. M. S. Gazelle um die Erde. 

 Monatsber. d. Berl. Akad. p. 456. 

 .Studer. Ibidem. 



Studer. iSSo. Übersicht über die während d. Reise S. M. S. Corvette Gazelle um 

 die Erde 1874 — 76 gesammelten Echinolden. Monatsber. Berl. Akad. p. 867. 

 Taf. I. Fig. 2. 

 Studer. Ibidem. Taf. I. Fig. 3. 

 Echinocidaris Dufresnii. F. Jeffr. Bell. 18S1. Account of the Zoological Collections made during the 



survey of H. M. S. 'Alert' in the Straits of Magellan and on the Coast of 

 Patagonia. IX. Echinodermata. Proc. Zool. Soc. p. 87. 

 K. Agassiz. 1881. Challenger-Echinoidea p. 58 (pro parte). 



— LovÉN. 1SS7. Echinoidea described by Linnœus. Bih. till K. Svenska Vet.- 

 Akad. Handl. Bd. 13. Afd. IV. N:o 5 p. 117. 



alternons. LovÉN. 1887. Ibidem p. 116. 



Dufresnii. 1895. F. BERNARD. Lchinides recueillis par l'expédition du Cap Horn (1882 — 

 1883). Bull, du Muséum d'hist. nat. 1S95 î^'^o 7 ?• 2- 



— 1896. M. Meiss.ner. Die von Herrn Dr. Plate aus Chile heimgebr.achten See- 

 igel. Arch. f. Naturgesch. Jahrg. 62. I. p. 83. 



— 1900. M. Meissner. Echinoiden d. Hamburger Magalhaensischen Saramelreise p. 5. 



— 1904. P. DE LoRtOL. Notes pour servir à l'étude des Échinodermes. 2 Ser- 

 II. p. S. PI. II. fig. 2—5. 



— 1905. C. E. Porter. Los equinidos chilenos del viaje del buque esplorador 

 »Challenger» estractados y adicionados de varias notas. Revista chilena. IX- 

 p. 131. 



— 1906. R. KoEHLER. Stéllérides, Ophiures et Échinides. Expédition antarctique 

 Française. Dr. Charcot, p. 29. 



— 190S. A. Agassiz & Clark. Hawaiian and other Pacific Echini. The Salenidse, 

 Arbaciadœ . . . Diadematidse. Mem. Mus. Comp. Zool. XXXIV p. 69. PI. 47. 

 Figs. I — II. 



Non: Echinocidaris af ricana TROSCHEL. 



This species, so very easily recognizable from its beautiful green colour, has 

 been so carefully described in the works quoted, especially by TROSCHEL, LovÉN 

 and DE LORIOL, that there is no reason to give a full description of it here again; 

 only a few remarks must be given, on account of the question of the specific vali- 

 dity of Arbacia alternans, and likewise on account of the new species, A. crassi- 

 spina, here distinguished from A. Dtifresnii, with which species it has hitherto been 

 confounded. 



The shape of the test is rather variable. As seen by the measurements given 

 here, the height varies very considerably. LoRIOI.'s statement (Op. cit. p. 9) »test 



"' Not seen by the author; quoted from Zoological Record 1905. 



