Tjalfiella tristoma n. g., n. sp. 
A sessile Ctenophore from Greenland. 
Preliminary Notice 
by 
Dr. Th, Mortensen, 
When carrjing out fisheries investigations aloug the West Coast 
of Greenland with the brig „Tjalfe u in the summer of 1908 Mr. 
Ad. S. Jensen found in the deep Umanak Fjord a localitj ex- 
ceptionally rich in magnificent specimens of Umbellula lindahlii Koil. 
The depth of the locality was 475—575 m. On the stem of 
some of the Umbellula he observed a curious small, jellylike, 
transparent organism, ca. 1—IV 2 cm. long, laterally compressed 
and having at each end an erect funnel, like a small tower. His 
othei duties did not leave him time for studying the animal more 
closely, only some specimens were preserved in formaline. On his 
return he asked me to examine the animal and describe it, if it 
proved to be unknown. 
The animal (Fig. 1) at first puzzled me very much. It did 
not appear like anything known as yet, and it seemed even very 
hard to determine to which class of animals it belonged. The 
bilateral body carries along the upper side of its middle part 
four pairs of roundish knobs, and at each end of the series a 
larger yellow body, from which a threadlike prolongation passes 
upwards through the funnel, sometimes projecting through the 
mouth of the funnel. In the middle of the flattened upper side 
there is generally a small, slightly prominent knob, in the middle 
of which a small pore may be observed more or less distinctly. 
Vidensk. Meddel, fra den naturh. Foren. 1910. 17 
