1895. | NEW YORK ACADEMY OF SCIENCES. 151 
PELAGIELLA, n. gen. 
In a paper written for the Royal Society of Canada in 1892 
the author described a singular spiral shell from Band } as of 
the genus Cyrtolites Conrad (printed Cyrtolithes), supposing 
that the whorl was symmetrical: the more abundant material 
obtained by Messrs. van Ingen and Matthew show that it is 
never quite svmmetrical, and that in this and other respects the 
reference to Cyrtolites will not hold; the author therefore pro- 
poses the above name, with the following description: Shell 
a discoid spiral of few whorls, flattened, lenticular, whorls some- 
what angulated at the outer edge, slightly flattened on the upper 
side, somewhat tumid on the lower. Lips of the aperture, both 
upper and lower, arched forward in the middle. Spire sunken. 
The peculiar lip appears to indicate that this animal was a free 
swimmer, and it is supposed to have been a Heteropod. It is 
gigantic compared with most of the shells of this sub-class, but 
there are some like the Violet-snail that are larger. Maclurea, 
Bellerophon &c., which also have been included in the Hetero- 
pods, are much larger. 
PELAGIELLA ATLANTOIDES. PI vi., figs. 6 a toc. 
Cyrtolithes atlantoides. Trans. Roy. Soc. Can., vol. xi., sec. iv., 
p. 94, pl. xvi., figs. 8a and b. 
There is a good deal of variation in the form of this shell, 
some being more flattened on the upper side than others. The 
spire is always sunken below the level of the last whorl, and the 
species is easily recognized by the peculiar constricted band 
around the last whorl, next the lip of the shell; the more perfect 
shells, lately found, show that the “shallow curving furrow 
near the inner edge of the whorl” is the impression left by the 
ventral portion of this band on the growing shell. The low 
ridge traversing the middle of the whorl on its upper side 
corresponds to the projecting almost angulated portion of the 
lip. The umbilicus is not well shown in any of the specimens. 
There is no notch or slit at the projecting part of the last whorl, 
but the depressed band at the back of the lip is pinched in a 
little on each side at this point. As there are no depressed 
sings on the shell, it appears that this constricted band was 
formed only on the adult shell. 
The species seems to be that of a free swimmer, and the form 
of the orifice corresponds to that of a Heteropod or a Nautilus, 
rather than that of a true Gasteropod. : 
Size. Somewhat larger examples are known than those first 
