ECHINIDAE 223 



are small, of the usual form, as are also the ophicephalous and triphyllous pedicellariae. 

 Only very few bihamate spicules in the intestinal walls, but the walls of the (coalesced) 

 gonads are studded with large bihamate spicules. Colour of the spines whitish. The 

 denuded test white with a faint greenish or brownish tint on the aboral side. The peri- 

 proct white, rarely with a tinge of greenish on the suranal plate. 



Particularly by the character of its periproct and by its colour this species is very well 

 distinguished from the two other species of Notechinus hitherto known, N. magellanicus 

 (Philippi) and novae-zealandiae, Mortensen. Also the number of interambulacral plates 

 is smaller. It might have been expected that these specimens from off Marion Island 

 would prove to be identical with the variety novae-amsterdamiae described by Doderlein 

 (Deutsche Tiefsee-Exped. Echinoiden, p. 229) from New Amsterdam, and Doderlein 

 {op. cit.) expressed the opinion that the specimens from off Marion Island and Prince 

 Edward Island taken by the ' Challenger ' and identified by Agassiz as Echinus magel- 

 laniais (Challenger Echinoids, p. 116) would belong to the var. novae-amsterdamiae. 

 Without having seen these specimens I venture to say that they will most probably be- 

 long to the present species, Notechinus marionis. The fact that H. L. Clark (Cat. Recent 

 Sea-Urchins Brit. Mus., p. 118) states their colour to be "very light" is in favour of 

 this suggestion, but re-examination of the specimens is necessary for definitely settling 

 this question. 



Loxechinus albus (Molina) 



Loxciiiiniis albus, Mortensen, 1910. Swedish South Polar Exped. Echinoidea, p. 52, pis. vi, 



figs. 1-6; viii; xvi, figs. 2, 4-5, 14, 16-17. 

 L. albus, H. L. Clark, 1925. Cat. Recent Sea-Urchins Brit. Mus., p. 134. 

 L. albus, Bernasconi, 1925. Result. Primera Exped. a Tierradel Fuego. Equinodermos, i, p. 7, 



Lam. i, figs. 4-6. 



St. 982. 18. X. 32. Sholl Bay, Cockburn Channel, Magellan Strait. Littoral, i specimen. 



Parechinus angulosus (Leske) 



Parechinus angulosus, Mortensen, 1903. Danish ' Ingolf Exped. Echinoidea, i, p. 108. 

 Protocetitrotus angulosus, Doderlein, 1906. Deutsche Tiefsee-Exped. Echinoiden, p. 204, 



Taf. xxvii, figs. 6-8; xxxv, fig. 16; xlvii, fig. 6. 

 Parechinus angulosus, H. L. Clark, 1925. Cat. Recent Sea-Urchins Brit. Mus., p. 117. 



1926. Saldanha Bay. Beach collection. 6 specimens. 



8. ix. 26. Simons Town, Cape Peninsula, 0-2 m. i specimen. 



St. 90. ii.vii. 26. Simons Town. Cape Peninsula, 1-2 m. 7 specimens. 



I must join Clark in regarding the species angulosus as the type of the genus Par- 

 echinus, Doderlein's genus Protocentrotus thus becoming a synonym of Parechinus. 



