HOLOTHURIOIDEA 367 



the first Elasipod discovered. It is an Arctic species, distributed 

 all over the cold Norwegian sea, from N. of Iceland to the Kara 

 Sea. It is known to go as far south as 62° 10' N., 0° 8' E., and 

 may well be expected to go as far south in the cold area as to 

 come into the British area (Faroe Channel). Bathymetrical 

 distribution ca. 70-2800 m. 



The species has also been recorded from off the Moroccan 

 coasts (2210-2300 m., ''Talisman"). It is, however, very 

 improbable that this eminently Arctic form should occur so 

 far south (and accordingly also all over the warm area of the 

 North Atlantic). Most probably this Moroccan form will turn 

 out to represent another species, which must then be named 

 Elpidia echinata (R. Perrier), having originally been announced 

 by Perrier under the name Tutela echinata. Nothing is known 

 of its characters excepting what may be concluded from the fact 

 that Perrier later on identified it with Elpidia glacialis. 



Kolga Danielssen and Koren. 



Body ovoid. Mouth anterior or subventral ; 10 tentacles. 

 Tube-feet of lateral ambulacra distributed along the whole edge 

 of body. Three pairs of dorsal papillae at anterior end of body, 

 united or not by a web. Calcareous bodies simple, pointed rods ; 

 no wheels or C-shaped bodies. 



One species, K. hyalina Dan. and Kor., known from the cold 

 Norwegian sea, ca. 2030-2140 m. ; another, K. nana Theel, from 

 off the N. American coast, 2285 m. (also recorded from the 

 Antarctic Sea, " Challenger "). There is some probability of 

 these two species also occurring in the British seas, the former 

 in the cold area of the Faroe Channel, the latter in the w^arm 

 area, off the west coast of Ireland. The two species are thus 

 distinguished : 



Dorsal paj)ill8e Linited by a web ; mouth subventral 



K. hyalina Dan. and Kor. 

 Dorsal papillae not united by a web ; mouth anterior 



K. 7iana Theel 



Irpa Danielssen and Koren. 



Differs from Kolga by its elongate body and the larger 

 number of lateral tube-feet and dorsal papillae. 



Only one species (and one single specimen) known, /. abyssicola 

 Dan. and Kor., from 63° 17' N., 1° 27' W., 1977 m. It may 

 well be expected that it will also be found farther south in the 

 cold area, thus within the British area. 



