250 
On the sides a varying number of larger irregularly placed, round 
knobs are found in the larger specimens. In the sidewalls, especi- 
ally in the transparent walls of the funnels an irregular, branching 
canal system is distinct. The basal surface is more or less 
irregularly folded. The outer surface of the animal is otherwise 
quite smooth. 
” It might be suggested that it was either a Coelenterate or a 
Tunicate. In fact there is something in the shape of the animal 
recalling tbe peculiar sessile Salp, Oetacnemus. But the study of 
its anatomy soon proved that it had no affinity whatever with the 
Fig. 1. Tyalfiella tristoma Mrtns 
The figure is in so far composed of 2 sedinee. i as no Sl" 
were developed in the one chosen for representation. 
Tunicates; but also for a Coelenterate its organisation seemed most 
unusual and puzzling. 
On studying the anatomy of the remarkable animal I observed 
the interesting fact that it is viviparous. The knobs on the 
sides proved to contain embryos, one in each, in different stages 
of development, and the more developed of these proved to be 
young Ctenophores in the Cydippe-stage, with distinet 
costæ and combs. Herewith the riddle was solved, and it was 
now easy enough to recognize in the adult animal a Ctenophore, 
though of most unusual appearance. 
The first thing becoming clear at once, when the animal had 
been proved to be a Ctenophore, was the yellow body at each end 
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