1865.] FROM THE ISLANDS OF THE CENTRAL PACIFIC, 513 
lissime striata ; anfractibus planis seu subconvezis, marginatis ; 
columella tri- seu quadriplicata, plicis obliquis ; apertura am- 
pliore, dimidium longitudinis teste a@quante ; labro tenut. 
Long. °3, lat. -09 poll. 
This elegant little species was found living in the hollows of coral- 
rock. When disturbed, the animal would skip 5 or 6 inches in a 
horizontal line, from one side of the cavity to the other, at the same 
time spinning out a very fine web. When held in the hand, it would 
jump off, suspending itself by a thread to a distance of 2 or 3 feet *. 
ENGINA FUSIFORMIS. 
E. t. fusiformi, utringque attenuata, medio angulata, basi con- 
tracta, canali recurvata, spira acuminata, longitudinaliter 
nodoso-costata, transversim sulcata et striata 3 anfractibus 
superne parum concavis ; columella superne subexcavata et pli- 
cata ; nigra, luteo irregulariter maculata et Sasciata ; aper- 
tura dimidium longitudinis teste equante, purpureo-rufescente. 
Long. °6, lat. -34 poll. 
ENGINA OVATA. 
E. ¢. abbreviato-ovata, utrinque acuta, basi parum recurvata ; 
longitudinaliter costata, transversim nodoso-lirata et striata ; 
apertura superne regulariter arcuata, infra contracta 3 nigra, 
lirarum interstitiis albis vel pullide luteo-fuscis, denticulis 
aperture albis. 
Long. °5, lat. -32 poll. 
NASSA OBLIQUA. 
N. t. crassa, solida, oblique globoso-ovata, transversim nodoso- 
lirata ; nodis parvis, compressis, longitudinaliter oblique costu- 
lata, et striis rugata ; spira curta, acuta; anfr. superne con- 
cavo-indentatis ; apertura parva, oblique ovali ; columella levi, 
excavata ; callo amplo, incrassato, spira tenus extenso ; labro 
calloso, intus lirato ; pallide fulva, liris transversis castaneis, 
nodis albidis ; apertura et columella aurantiaco-luteis ; callosi.. 
tate albida. 
Long. 14, diam. 12 mill. 
CoRALLIOBIA SCULPTILIS. 
C. t. alba, valde depressa, planulata, ovata; labro continuo, ex- 
panso, radiatim costulato ; spira minima, in labro inclusa 3 lon- 
gitudinaliter imbricatim laminata, transversim costata, costis 
tribus rotundatis ; labro radiatim costulato 3 canali brevi, an- 
gusta. 
Long. 9, diam. 7 mill. 
This elegant little species, of a rare genus, was brought up on 
coral from a depth of 90 fathoms. 
* From the large size of the nuclear whorls, which are seldom seen in adult 
Mitrids, it is probable that this delicate little shell is not mature.—P, P. C, 
