2 PROCEEDINCJS: BOSTON SOCIETY NATURAL HISTORY. 
The animals in life were transparent but the presence of numerous 
vacuoles, filled with yellow or yellowish brown fluid, in the integu- 
ment prevented a clear view of the internal organs. They swam 
vigorously at the surface of the water by means of the fins, and after 
two or three minutes would retract the fins and partially draw in the 
head, sinking at the same time to the bottom of the shallow dish in 
which they were kept, to rise again in a short time and repeat the 
operation. Several free-hand sketches were made at the time, some 
of which are reproduced here as "habitus pictures." 
J. S. Kingsley. 
The characters of the gymnosomatous pteropod whose occurrence 
Professor Kingsley describes above, are such that it cannot be referred 
to any of the existing genera. I am therefore obliged to describe it as 
a new genus. This genus does not properly fall under any established 
family although perhaps it approaches most nearly the Clionidae, 
from which it differs in having an odd number of cephalocones and in 
having the entire posterior part of the body filled by the viscera. The 
following characters will serve to distinguish it from other genera. 
Paedoclione^ n. g. 
Body barrel-shaped, slightly larger behind. Head and posterior 
end retractile. Three bands of cilia resembling the ciliated rings of 
pteropod larvae. Head with one (anterior) pair of retractile tentacles. 
Cephalocones unarmed, three in number, two of them on the right, 
one on the left side of the buccal mass. "Hook sacks" replaced by 
two thickened areas (ankistrophores) on the dorsal wall of the pharyn- 
geal cavity each bearing a few (5-8) rather strong hooks. Radula 
with broad non-cuspidate median tooth and five lateral teeth on either 
side. Foot divided into three lobes; an approximate pair in front, 
and a large backward-curved median portion behind. The viscera 
fill the entire posterior part of the body. 
Paedoclione doliiformis n. sp. 
Transparent; barrel-shaped; small, about 1.5 mm. in length; head 
when expanded elliptical in outline; anterior ciliated band broken up 
into segments; expanded parapodia (wings) flat, long, ovate; middle 
lobe of foot rather large. 
' irais, cliild, and Clione. 
