356 MOLLUSCA. 
surface is marked with fine radiating strie, and by crowded loose 
lines of growth, giving the surface a decomposing aspect. Mar- 
gin sharp, irregular; interior mottled with cream-colour, and clear 
chestnut-brown; central spatula thick, and well marked; a marginal 
border is striped alternately chestnut and yellow, answering to the 
ribs and intervening spaces. Summit eroded, dark brown. 
Length four-fifths of an inch ; breadth half aninch; height one-fourth 
of an inch. 
The specimens were marked Rio Janeiro, but they so much resem- 
ble shells from the Pacific coast, that I think there must be some mis- 
take. ‘They especially resemble depressed specimens of L. scabra. 
Figures 461, 461 a, 461 6, outer, inner, and profile views of the 
shell. 
Lorria scurum (Escuscuoutz), as figured by D’OrBicny; Amer. 
Merid., pl. 64, f. 8, 9. Varieties have also received from Eschscholtz 
the names of Acmea persona, A. radiata, and A. ancylus. 
The anrat has the foot a light ochreous colour, lower part of head 
the same, upper part, back of head and tentacles having a laky tinge; 
tentacles long and slender, with the eyes at their base hardly apparent, 
nearly on back part. Mantle lighter coloured than the foot, sometimes 
faintly tinged with green, full of numerous transparent veins and 
fringed with close-set, short, marginal cirrhi (almost as fine as hairs). 
Branchial plumule elongated and slender, just apparent externally on 
right side of the neck. Motions active. [J. P. c.] 
Found in exposed situations near Vigna del Mar, Bay of Valpa- 
raiso. 
Lorria scorra? (Lesson). 
AntmaL almost colourless, except the head, which has a roseate 
tint. Head very large, and the mouth furnished with a sort of fringed 
lip, formed by a prolongation of the muzzle; tentacles very large and 
