CATALOGUE—SHELLS. ° 557 
labri margine tenui, castaneo-maculatd ; long. 43 ; lat. 44; poll. 
Habitat 2? Mus. nost. 
5]. Lirrorina STRIATA. 
L. testé ovato-conicd, fuscd, striis elevatis scabrd; spird brevi; an- 
JSractu basali tumido ; aperturd nigricante, basin versus strigd luteo- 
albd ornatd ; labri margine crenulato albo-fulvido ; operculo nigro ; 
long. $ paulo plus ; lat. ="; feré ; poll. 
Habitat in Mari Atlantico boreali (Port Praya). Mus. Brit., 
nost. 
52. MARGARITA FASCIATA, N.S. 
M. testé albidd, creberrimé striatd, purpureo fasciatd, aperturd ar- 
gented ; long. 4, ; lat. 5, feré ; poll. 
Habitat in Mari Pacifico. Mus. nost. 
Portions of the striated surface are elevated into belts, which 
are of a purple colour. 
53. MARGARITA VIOLACEA. 
M. testd sub-ovatd, violaced, spird brevi; anfractibus tumidis ; 
aperturd iridescente ; long. +1; ; lat. -8; fere ; poll. 
Habitat ad fretum Magellanicum. Mus. Brit., nost., Brod. 
Of this shell the Indians make their necklaces ; it is found adher- 
ing to the leaves of the Fucus giganteus, and is the principal 
food of the Steamer or Racehorse Duck ( Micropterus Patachoni- 
cus, nob. in Proceedings of the Zoological Society, December 14, 
1830, page 15). 
54. MARGARITA CORULESCENS. 
M. testé sub-complanatd, cceruled, striata, albido-lineatd, apertura 
aridescente ; lat.1% feré; long. 15; poll. 
Habitat ad fretum Magellanicum (Cape Gregory). Mus. Brit., 
nost., Brod. 
55. TURRITELLA TRICARINATA. 
T. testd turritd, anfractibus tricarinatis ; carinis nodulosis ; long. 
13; lat.-9, paulo minus ; poll. 
Habitat ad oras Americe meridionalis (Valparaiso). Mus. Brit., 
nost., Brod. 
The Carine are nodulous, or twisted like the strands of a rope ; 
the twists of the upper carina are in the direction of a water-laid, 
