THE NAUTILUS. v0 
Chatham Island, 1600 feet, 1 specimen, Dr. Baur. 
This shell recalls H. arborea Say, but is much smaller and has a 
different umbilicus. In the characters of the aperture, etc., not 
mentioned above, it duplicates arborea. 
Conulus galapaganus na. s. 
Shell close to C. fulvus, but has five whorls to four in a specimen 
of fulvus of the same diameter; it has a very well marked suture 
and the whorls between the sutures are more rounded than in 
fulvus. The height of C. galapaganus is greater in proportion to 
the number of whorls. Alt. of shell 3°25; max. diam. of shell 2°5 
mm. 
Chatham Island, 1600 ft., Dr. Baur. 
This shell appears to difter from all the forms like fulvus, selenkai, 
ccecocides, etc., by its smaller size, very brilliant surface, inflated 
whorls and number of turns. It wants entirely the spiral striation 
of Zonites bauri which isa much larger and more depressed shell. 
In fact it seems like an elevated, dwarfed and inflated C. fulvus. 
There are probably other Helices on the islands which have not 
yet been collected. 
Succinea corbis n. s. 
Shell small, of two anda half whorls, to which a black mould 
adheres with tenacity. The first whorl and a half are salmon pink 
in the adult but the young of the same size are pale amber. In the 
adult the last whorl is of a pale straw color. The shell resembles 
S. wolfi in form but is smaller and has a more contracted aperture ; 
it is instantly recognized, when examined with a good lens, by its 
surface which is minutely shagreened all over with an excessively 
fine network of closely recticulated incised lines. Alt. of shell 4., 
max. diam. 4; extreme length of aperture 4 mm. 
S. Albemarle Island on dry bones of turtles, Dr. Baur. 
The remarkable sculpture is not visible to the naked eye except 
as a sort of hoary bloom on the surface. Under a compound 
microscope it looks like closely woven basket work. I have exam- 
ined a great many Succineas without finding any other species pos- 
sessing this character. The sparse dichotomous impressed sculpture 
which appears on Succineas from Samoa and other oceanic islands 
and is occasionally visible on 8S. beftii is an entirely different 
thing. 
