—rr 
141 
basi subcompressus ; columella simplex, leviter arcuata ; aper- 
tura parum obliqua, oblonga ; perist. album, nitidum, undique 
latiuscule expansum, marginibus conniventibus, columellari pa- 
tente. 
Long. 22-23, diam. 11-12 mill. 
B. Paulo ventrosior, albido et isabellino radiata. 
Hab. Erumanga, New Hebrides (Mr. Turner). 
6. Descriptions or New Species or MoLiuscA FROM THE 
Sanpwicu Isuanps. By W. Harper Pease. (Communt- 
caTepD By Dr. J. E. Gray.) (Part II.)* 
Genus POLYBRANCHIA. 
Body oblongo-ovate, provided with several rows of lobes, commen- 
cing at anterior portion of the body, and extending in continuous 
series around the posterior part; lobes deciduous. Branchiee im- 
bedded in the lobes. Cephalic tentacles bifurcate. 
52. PoLYBRANCHIA PELLUCIDA. 
Animal.—Oblongo-ovate, pellucid. Cephalic tentacles long, cylin- 
drical, slightly tapering to a blunt point, bifurcate from the base, one 
part curving slightly anteriorly and the other posteriorly, grooved (?), 
on the inside, opposite each other. Labial tentacles of same shape, 
shorter. The body furnished with four rows of lobes, commencing 
opposite the cephalic tentacles, and passing in continuous series 
around hinder part of the body, leaving a narrow space on dorsal 
region bare; lobes deciduous, pellucid, of a jelly-like consistency, 
close, disposed alternately, those on the edge of the mantle smallest, 
increasing in size as they ascend over the sides and back of the body, 
cylindrical at the base, spreading out in a fan-like shape, overlapping 
each other. Branchiz imbedded in the substance of the lobes, ra- 
mose; the stem commencing at the base of the lobes and branching 
out, following their form, not extending to the edges of the lobes. 
Foot same size as the mantle. 
This singular species was very active, when handled casting off 
its upper lobes, and when plunged in alcohol instantly detaching the 
whole. 
53. VEXILLA FUSCO-NIGRA. 
Shell abbreviately fusiform, ventricose, solid; spire moderately 
produced, acute, and less than half the length of the shell ; whorls 
six, convex, furnished with close transverse granular ribs; suture 
impressed ; body-whorl large, ventricose, and marked with coarse, 
remote, revolving impressed lines, and fine longitudinal strize and 
wrinkles ; canal short, slightly recurved; aperture oblong-ovate; outer 
* See P. Z.S. for January 11, antea, p. 18. 
