66 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 
and for the most part considerably narrower, than twice 
the diameter of the notochord; while in Moss’s individual 
the muscle-bands are drawn three times the width of the 
notochord almost along their whole length. Thirdly, in 
the former species the intestine is extremely short and 
the anus is inconspicuous ; while in the latter species the 
intestine appears to be of more normal length and the 
rectum is said to open through a papilla. Fourthly, a 
characteristic habit has been described for each species, 
which is not the same in the two cases. K. tenwis, 
without changing its situation, gives every 3 or 4 seconds 
a stroke of its tail, which puts it in a position at right 
angles to its preceding position, so that after four strokes 
of its tail it has returned almost to its first position (Fol, 
l.c., p. 87); Moss’s species, on the other hand, “can be 
recognised at a glance by the pecuhar scroll-like manner 
in which its slender lanceolate flabellum is rolled upon 
itself when the animal is at rest.”’ It is, of course, easily 
conceivable that these two habits might coexist in the 
same species; but it is extremely unlikely that the habit 
noticed by Moss would have escaped the keen eye of Fol, 
or would have been unmentioned by him, if it had occured 
in the species he described. The distribution is also 
seemingly different; K. tenwis has only been found in the 
Mediterranean, while Moss’s species was met with in the 
Equatorial Atlantic, ‘‘and occasionally as far north as off 
the coast of Portugal.”’ 
The following diagnoses represent briefly the relations 
which I have endeavoured to establish between the two 
remarkable Appendicularians mentioned in this note :— 
Genus KowaLEvskIA, Fol, 1872 (emend. 1874). 
Tunicata Perennichordata, consisting of a smooth ovoid 
body, truncated anteriorly, and a long lanceolate tail, 
