ECHINOIDEA. II. 115 



Sch. fragilis, and even more the quite similar development of the fascioles in Abatits cavcrnos2is.^\\^r^ 

 both lateral and anal fasciole generally disappear witli age, shows tliat the latero-anal fasciole is part 

 of the primary fasciole. 



Sch. fragilis was taken by the -Ingolf >-Expedition at the foUowing stations: 



St. 25 (63° 20' Lat. N. 54° 25' Long. W. 582 fatlioms 3°3C. Bottom temp.) 5 specimens. 



- 27 (64° 54' - 55° 10' - 393 - 3°8 - - ) 10 



- 28 (65" 14' — 55° 42' — 420 — 3°5 — — ) Numerous specnnens. 



- 32 (66° 35' - 56° 38' - 318 - 3°9 - - ) 35 



- 35 (65° 16' - 55° 05' - 362 - 3°6 - - ) 5 



- 54 (63° 08' -^ 15° 40' - 691 - 3°9 - - ) I - 



- 81 (61° 44' — 27° 00' — 485 — 6^1 — — ) 2 — 



- 85 (63=' 21' — 25" 21' — 170 — — — ) I — 



- 89 (64° 45' — 27° 20' — 310 — 8°4 — — ) 4 - 



- 97 (65° 28' - 27° 39' - 450 - 5°5 - - ) 2 - 



The species was further taken in the Davis Strait by Wandel 1889 (63° 56' Lat. N. 53' -12' 

 Long. W. 130 fathoms. i specimen). Several specimens were taken at the Faroe Islands (150—190 

 fathoms) by the author in 1899 and by Ad. S. Jensen («Michael vSars>. 1902). 



The bathymetrical distribution of this species is ca. 35—700 fathoms. In the vChallenger*- 

 Echinoidea, p. 221 it is stated to have been taken (by the «Blakej) at a depth of 955 fathoms at the 

 «Caribbean Islands . I cannot find in the Preliminary Report on the < Blakev-Echini (Bull. Mus. Comp. 

 Zool. VIII. 1880. Nr. 2. p. 84) or in Professor Rathbun's works any locality to wliich this statement 

 might refer. — The geographical distribution of ScJi. fragilis is: from the Northern Norway to the 

 Faroe Channel, South of Iceland, Davis Strait and along the American coast down to Florida. On the 

 European side of the Atlantic it is not known farther south than the Faroe Channel, and it is not 

 known from the Mediterranean or the Azores. 



Sars (loc. cit.) and recently Grieg (loc. cit.) point out that Sch. fragilis is both more connnon 

 and reaches a considerably larger size at Northern Norway than farther South ; thus it reaches a 

 size of 90™'" leugth at the Northern Coasts, whereas the largest specimens known from Bergen are 

 only 55""'. (A specimen from the Faroe Islands has the same size, and a specimen from the American 

 Coast (S. of Long Island, 302 fathoms) is 60""" in length). «It is therefore without doubt to be regarded 

 as an arctic form-. It is certainly a remarkable faet that the largest specimens are from the most 

 northern locality, but nevertheless Sch. fragilis is evidently no arctic form. It is not found in the cold 

 area of the Norwegian Sea, occurring only where the bottom temperature is positive. It is oue of 

 those rather numerous species, which belong to the Northern Atlantic, the warm area, but, ou account 

 of the peculiar hydrography of the Norwegian Sea, proceed far North along the Norwegian Coast. 



In the < Challengers-Echinoidea (p. 201—2) Sch. fragilis is recorded from the Cape of Good 

 Hope, and recently Professor BelD likewise records the species from South of Africa. Doderlein 

 (Op. cit. p. 250) supposes that these specimens are really Sch. capciisis Studer, of which species a careful 

 description and figures are given. Having myself examined the type siDCcimen of the Sch. capcnsis in 



1 The Echinoderma found off the Coast of South Africa. I. Echiuoidea. Marine Investigations in South Africa. III. 

 1904. p. 175. 



15* 



