Bd. VI: 4) 
THE ECHINOIDEA. 
49 
usually found in the Sterec hinus-spccits, (PL XVI. Fig. i). They are, upon the whole, 
rather small and slender, reaching scarcely the size of I mm. length of head. The 
ophicephalous and triphyllous pedicellariæ show no specific characters. — The sphæ- 
ridiæ continue to the 13th — 14th ambulacral plates in larger specimens, ca. 35 in 
each series. They are elongate, oval, smooth (PL XVI. Fig. 18). 
Spicules (PL XVI. Fig. 8) are rather numerous in the tubefeet; no spicules are 
found in the walls of the intestine, genital organs, axial organ or stone canal. The 
genital organs are not anastomosing. 
The colour in alcohol is whitish. There are no indications of the colour of the 
living animal. 
The species was taken by the Expedition at the following stations: 
Station 16 (51° 40' S. 57 0 25' W. 150 m. Between Falkland Isl. and South Georgia). 
6 specimens. 
» 17 (53 0 34' S. 43° 23' W. 160 m. Shag Rocks Bank). 1 specimen; identi- 
fication uncertain. 
» 20 (54 0 12' S. 36° 50' W. 250 m. South Georgia). 1 specimen, ? hybrid. 
» 22 (54° 1 7' S. 36° 28' W. 75 m. » » ). I » 
» 59 (53° 45' S. 6i° 10' W. 137 — 150 m. Burdwood Bank). 2 specimens. 
Falkland Islands 1 specimen. 
No locality (? Stat. 16) 3 specimens. 
The geographical distribution of this species appears to be very restricted. It 
is known with certainty only from the Southern Extremity of South America, as 
far north as 49° 35' S. on the Atlantic side, while there are no certain indications 
for the Pacific side; further it is known from the Falkland Islands and South Georgia, 
while its occurrence at Juan Fernandez is doubtful (»Hassler» Echini, p. 12). The 
bathymetrical distribution is ca. 75 — 250 m. DöDERLEIN (Op. cit. p. 224) gives 
29 — 447 m. as its bathymetrical range (rounded to 25 — 450 m. in my list in the 
Echinoidea of the German South Polar Expedition, p. 105). As for the statement 
of its occurrence at a depth of 447 m. it is based on the »Challenger» Echinoidea 
(p. 1 17); Professor AGASSIZ having, however, not distinguished sharply the Sterechi- 
;^?^-species (at least St. diadema has been confounded with the present species, 
probably also St. Neumayeri), this statement is not quite certain and had better be 
left out of consideration, until a renewed examination of the »Challenger»-specimens 
has been undertaken. The statement of its occurrence at so low a depth as 29 m. 
is due to M. MEISSNER, who in his »Echinoideen der Hamburger Magalhaensischen 
Sammelreise» 1900, p. 11, records the species from West Patagonia, Gulf of Penas, 
1 6 fms. Through the kindness of Dr. O. STEINHAUS I have received these speci- 
mens for examination and find them to be Notechinus viagellaniats (whereas those 
from the two other localities named there are correctly identified). The bathy- 
7 — 100133. Schwedische Siidpolar-Expedition iqoi — iQoj. 
