REPORT ON THE HOLOTHURIOIDEA. 39 



Kolga, Dauielssen and Koren. 

 Kolga, Dan. and Kor., Nyt Magazin for Naturvidenskaberne, xxv. 2, 1879. 



Kolga hyalina, Dauielssen and Koren. 



Body elongatedly oval, thrice to thrice and a half as long as broad. Mouth anterior, 

 ventral. Anus posterior, dorsal. Tentacles of almost equal size ; their terminal part 

 with small digitate processes. Pedicels large, seven to nine along each side of the 

 ventral surface. The foremost part of the dorsal surface, with six small processes close- 

 set in a row on a low, slightly curved transverse ridge ; the two middle ones a little 

 larger. Integument very thin and transparent, with several sorts of calcareous deposits : 

 minute unbranched, more or less spinose and irregularly curved, often horseshoe-shaped 

 spicula ; larger ones more or less curved, spinose, and not very seldom with longer and 

 shorter branches ; bodies having the form of network and of small rosettes. 



Length, about 50 mm. Breadth, about 12 to 15 mm. 



Habitat— Station 295. Lat. 71° 59' N., long. 11° 40' E. Depth, 1110 fathoms ; 

 bottom temperature, 1*3° C. Biloculina mud. Station 303. Lat. 75° 12' N., long. 

 3° 2' E. Depth, 1200 fathoms ; bottom temperature, 1"6° C; brown mud. 



This form differs, however, in several other characters of more or less importance from 

 the preceding one, as, for instance, in the construction of the calcareous ring, &c. ; but 

 the greatest difference is in regard to the madreporic canal, which communicates with 

 the exterior in Kolga, whde its extremity is united with the inside of the body-wall 

 in Irpa. 



Kolga nana, Theel (PL II. figs. 3, 4). 



Elpidia nana, Theel, Preliminary Report on the Holothuricte, pp. 15, 16. 



Body elongatedly ovate, from twice and a half to thrice as long as broad. Mouth 

 anterior, terminal, slightly ventral. Anus posterior, subdorsal. Tentacles of equal size ; 

 their terminal part bearing several small, digitate, retractile processes. Pedicels eight or 

 nine along each side of the ventral surface. The dorsal surface with three pairs of small 

 processes anteriorly, close-set in two rows, converging forwards. Integument thin 

 and transparent, with two sorts of calcareous deposits : numerous minute, unbranched, 

 more or less irregularly curved, frequently horseshoe-shaped spicula, provided with some 

 small spines ; and very few bodies in the form of a network. 



Colour in alcohol, light grey or white. Length, about 16 mm. Breadth, about 

 5 mm. 



Habitat.— Station 50. May 21, 1873. Lat. 42° 8' N., long. 63° 39' W. Depth, 

 1250 fathoms; bottom temperature, 2 '8°; grey ooze. Several specimens. 



Station 152. February 11, 1874. Lat. 60° 52' S., long. 80° 20' E. Depth, 1260 

 fathoms; diatom ooze. One incomplete individual. 



