54 THE NAUTILUS. 
Bulimulus (Nesiotus) tortuganus n. s. 
Shell small, solid, moderately elongated with six and a half 
whorls ; the earlier whorls subtranslucent madder brown with a pale 
peripheral stripe, more or less silky and sculptured with very fine 
spiral lines ; sutures very distinct ; later whorls malleated, wrinkled 
or pecked; rude, fleshy white, with a variably large perforate 
umbilicus ; aperture small, with a Jump on the pillar and another 
within the middle of the outer lip; lips thickened, white, slightly 
reflected, the throat brownish, body with a thin, transparent callus. 
Lon. of shell 12, of aperture 5°5; max. diam. of shell 7 mm. 
La Tortuga, grassy zone, South Albermale, Baur. 
This shell which is very characteristic seems to be abundant 
where found by Dr. Baur. Itseems nearest to B. simrothi Reibisch. 
of the described species. It is remarkable for the illustrations it 
gives of the varied influence of the environment on different individ- 
uals. The sculpture of the last whorl recalls that of B. rugiferus. 
The young is hispid and colored like that of wnifasciatus, but is 
narrower; the pale peripheral band is almost wholly obscured in 
the adult and the hairs are soon lost. 
Bulimulus (Nesiotus) Bauri nu. s. 
Shell small, short, stout, with a dark rapidly attenuated spire, 
distinct suture, and opaque yellow-brown last whorl ; whorls about 
seven, the earlier ones dark livid purple with straw colored streaks, 
paler at the suture, rude and malleated ; last whorl inflated, more 
or less transversely wrinkled, somewhat polished ; umbilicus closed 
or a mere chink; aperture subquadrate, angulated behind and at 
the base of the pillar; pillar short, oblique; lips simple, thick, 
especially across the body where the callus has a raised edge ; throat 
white. Lon. of shell 10, of aperture 45; max. lat. of shell 6°5 
mm. 
Hibernating on the under side of leaves of plants at the Southwest 
end of Chatham Island, 1600 ft. above the sea, Dr. Baur. 
This is one of the most distinctive species of the whole group. 
Hyalinia chathamensis n. s. 
Shell small, thin, straw colored, depressed, with four rounded 
polished whorls; suture distinct; sculpture of numerous radiating, 
slightly flexuous, indented lines; umbilicus deep, exhibiting all the 
volutions, but rather narrow. Max. diam, 3, min. diam. 2°25 mm. 
Alt. of shell 1°30 mm. 
