Bd. VI: 4) THE ECHINOIDEA. 49 



usually found in the S(e;rc/ii//us-species (PI. 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 pedicellariœ show no specific characters. — The sphse- 

 ridiae continue to the 13th — 14th ambulacral plates in larger specimens, ca. 35 in 

 each series. They are elongate, oval, smooth (PI. XVI. Fig. 18). 



Spicules (PI. 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' 25' W. 150 m. Between Falkland Isl. and South Georgia). 

 6 specimens. 



" Jy (53 34' S. 43' 23' W. 160 m. Shag Rocks Bank), i specimen; identi- 

 fication uncertain. 



» 20 (54° 12' S. 36' 50' W. 250 m. South Georgia), i specimen, ? hj-brid. 



>- 22 (54° 17' S. 36^28' W. 75 m. » » ). I » 



» 59 (53° 45' S. 6r 10' W. 137 — 150 m. Burdwood Bank). 2 specimens. 

 Falkland Islands i specimen. 

 No locality (? Stat. 16) 3 specimens. 



The geographical distribution of this species appears to be very re.'îtricted. 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 F'ernandez is doubtful (»Kassier» Echini, p. 12). The 

 bathymetrical distribution is ca. 75^250 m. DoDERLEIN (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. 117); Professor Agassiz having, however, not distinguished sharply the 5/«'^^/^?'- 

 ««5-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 »Challengers>-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, 

 16 fms. Through the kindness of Dr. O. STEINHAUS I have received these speci- 

 mens for examination and find them to be Notechiniis inagellaniciis (whereas those 

 from the two other localities named there are correctly identified). The bathy- 



7 — li}fii:i:t. Sch'vtdische Sndfolar-Expcdition igoi — igoj. 



