2o6 Soiithern Cross. 



front has a double edge and is somewhat produced or auriculate on 

 each side, and is completely concealed heneath the enormously 

 developed notaeum. The measurements given above are only 

 approximate, as, owing to contraction of the animals at the time 

 of death, the form and natural dimensions become altered and 

 diminished. 



LAMELLARIA CONICA. 



(PI. XXIV., fig. 4.) 



Testa ovata, superne acuminata, conica, tenuis, pellucida, periostraco tenui pallido 

 induta, lineis incrementi curvatis consi>icius sculpta ; anfractus quatuor, celeriter 

 accrescentes, duo superiores (]irot.oconcha) flavescentes, aliis crassiores, con- 

 vexiusculi, ultimus maxiiuus, ventricosus, infra suturaiii anguste margiuatus ; 

 apertura magna, inverse late auriformis ; peristoma tenue, margine cohuiielliiri 

 arcuate, leviter incrassato, callo tenui ajipreso labro juncto. 



Longit. 18 inm., diani. 14 mm. A])ertura 14 longa, 10 lata. 



Hcibitat. — Cape Adare, 28 fathoms. 



Only a single specimen of this interesting species was obtained. 

 The animal is much contracted in spirit and of a buff colour, but when 

 alive is said to be reddish-brown. The mantle investing the shell is 

 very thin above, but thicker at the sides, and in the contracted state 

 has a granose or finely warty appearance. The foot is short, some- 

 what quadrate in front and tapering behind. The tentacles are very 

 short and blunt, the eyes at the outer bases being conspicuous and 

 prominent. The apical whorls exhibit one or two spiral shallow 

 sulci, but this feature may not be constant. 



NATICA DELICATULA. 



(PI. XXIV., fig. 6.) 



Testa globosa, tenuis, anguste jierforata, ])eIlucido-albida, periostraco dilute virescente 

 tenui induta, lineis incrementi tenuibus obliquis striata; spiraobtusa; anfractus 

 tres celeriter crescentes, convexiusculi, ultimus globosus, infra suturam concave 

 impressus, antice deacendens ; apertiu'a semicircularis ; labrum tenue; columella 

 incrassata, refle.xa, superne leviter dilatata, labro callo tenui juncta. 



Diam. maj. 7^ mm., min. 6 mm., alt. 7^ mm. Apertura G njm. loniia, 3^ mm lata. 



Operculum tenue, testaceum, extus leviter concavum, album, infra flavescens. 



Hcibitat. — Cape Adare, 26 fathoms. 



The single specimen obtained has the spire much eroded. The 

 suture dividing tlie whorls is rather deep, but liardly channelled. 



