SHELLS OF SOUTH AMERICA. 45 
389. TrrroNn scaBEr, Brod., d’Orb. Voy. v. 450. t. 62. 
f.13. B.M. 
Peru. 
__ A very variable species. The periostraca largely hirsute, 
sometimes only velvet-like. 
390. RANELLA VENTRICOSA, Brod., d’Orb. Voy. v. 451. 
ae bbs V2. B.M. 
Peru. 
Eggs (marked “ Ranella inflata, Brod.”) small, crowded. 
391. RaneLua Kinet, d’Orb. Voy. v. 451. B.M. 
Triton ranelliformis, King. 
Chil. 
Operculum oblong, rounded at each end, with the nucleus 
on the front of the outer margin. 
392. Murex MaGELLaAnicus, Gmelin, d’Orb. Voy. v. 
451. B.M. 
Patagonia; Maghellan Straits. 
393. Murex Pataconicus, d’Orb. Voy. v. 452. t. 62. 
| Se a B.M. 
Patagonia. 
394. Murex VARIANS, d’Orb. Voy. v. 452. t. 62.f. 4-7. B.M. 
Patagonia. 
Murex Magellanicus, M. Patagonicus and M. varians are va- 
rieties of a most variable species. The lamelle are sometimes 
very close, regular, crowded (M. Magellanica); at others few 
and far apart, giving an angular shape to the body whorl 
(M. Patagonica) ; often completely wanting, the shell being only 
slightly spirally striated (JZ. varians). They clearly pass into 
each other, and vary greatly in the thickness of the shell: those 
that are closely lamellar are generally thin and brittle ; the older 
ones, without lamelle, are thick and solid, as in our Purpura 
lapillus, showing that the absence of the lamellze and thickness 
of the shell depend on the locality. 
These shells also vary in the size of the cavity on the front of 
the axis. 
