26 



TH. MORTENSEN, 



(Schwed. Siidpolar-Exp. 



Echinocidaris Scythei Phiuppi. 1857. Neue Echinodermen d. chilenischen Meeres. Arch. f. Naturgesch. 

 1857. I. p. 131. 



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



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



Echinocidaris {Agarites) Dufresnii. Troschel. 1873. Die Familie der Echinocidariden. Arch. f. Naturgesch. 



XXXVIII p. 307. XXXIX. 1874. p. 319. 



— altimans. Troschel. 1 873. Die Familie der Echinocidariden p. 307, II. p. 323. 

 Arbacia Dufresnii. Studer. 1876. Uber Echinodermen a. d. antarktischen Meere und zwei neue Seeigel 



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

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



— alternans. Studer. Ibidem. 



— Dufresnii. Studer. 1880. Ubersicht uber die wahrend d. Reise S. M. S. Corvette Gazelle um 



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

 Taf. I. Fig. 2. 



— alternans. Studer. Ibidem. Taf. -I. Fig. 3. 



Echinocidaris Dufresnii. F. Jeffr. Bell. 188 1. 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. 



Arbacia — A. Agassiz. 1881. Challenger-Echinoidea p. 58 (pro parte). 



— Loven. 1887. Echinoidea described by Linnteus. Bih. till K. Svenska Vet.- 



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



— alternans. Loven. 1887. Ibidem p. 116. 



Dufresnii. 1895. F. Bernard. Lchinides recueillis par l'expedition du Cap Horn (1882 — 

 1883). Bull, du Museum d'hist. nat. 1895 N:o 7 p, 2. 



— — 1896. M. Meissner. Die von Herrn Dr. Plate aus Chile heimgebrachten See- 



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



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



— — 1904- P- DE Loriol. Notes pour servir a l'etude des fichinodermes. 2 Ser- 



II. p. 8. PI. II. fig. 2—5. 



* — — 1905. C. E. Porter. Los eqm'nidos chilenos del viaje del buque esplorador 



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

 p. 131. 



— 1906. R. Koehler. Stellerides, Ophiures et fichinides. Expedition antarctique 



Franchise. Dr. Charcot, p. 29. 



— 1908. A. Agassiz & Clark. Hawaiian and other Pacific Echini. The Salenidx, 



Arbaciada; . . . Diadematidse. Mem. Mus. Comp. Zool. XXXIV p. 69. PI. 47. 

 Figs. 1 — II. 

 Non: Echinocidaris africana Troschel. 



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

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

 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- 

 sfina, here distinguished from A.. Dufresnii, 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. LoRIOL's statement (Op. cit. p. 9) »test 



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



