The specimen here described belongs to the collection of 
Ascidians in the Swedish State Museum. 
The external aspect and still more the peculiarities oi the 
internal structure of the individual excite considerable interest, 
uniting as they do characters which distinctly show its alliance 
to the Styelidae, thereby distinguishing it from all other known 
species of the group. 
Styela theeli*) n. sp. 
Locality. 
Norway: Hardanger, Samlenfjord. Depth 350 fathoms. 
Bottom, rocks. July 23, 1880. Bovallius. 1 specimen. 
External appearance. 
The single specimen of the collection is of elliptical 
outline; the body is greatly flattened dorso-ventrally and 
attached by the left side by a somewhat expanded base. 
The apertures are placed at the anterior end of the animal 
and not far apart. They are four-lobed and surrounded by 
small folds and papillae of light colour. Wrinkles in the 
test prevent them from being easely distinguished. (Cf. Pl 1 
fig. 1). | : 
In living specimens the siphons are-in all probability 
projected, though in this preserved individual they are retracted. 
The test of the upper side, i. e. the right side, of the 
animal is of dark-brown colour, coriaceous and wrinkled. It 
*) In associating with the species the name of Professor Doctor 
Hj. Théel, I desire to express my appreciation of the interest he has 
taken in the study of the Swedish Tunicata. 
