GASTEROPODA. 347 
Patella conica, Gouin; Proceed. Boston Soc. Nat. Hist., i. 151. 
July 1846. Expedition Shells, 9. 
SHELL small, rather solid, regularly conical, the apex nearly cen- 
tral, and the aperture nearly circular; surface regular and smooth, or 
but faintly striated with minute, radiating, and concentric lines. 
Colour a dirty-drab, or yellowish ash-colour ; interior cinereous; edge 
simple, with a regular marginal limbus of a darker colour, its internal 
edge defined by a furrow. 
Length eleven-twentieths of an inch; breadth half an inch; height 
three-eighths of an inch. 
Inhabits Puget Sound, Oregon. 
That this is but a variety of P. scurra, Lesson, or Acmea mitra, Esch- 
scholtz, a large series of specimens might show. But it seems to be 
more elevated, less symmetrical, and more delicate in its structure and 
markings, especially in the radiating strie, 
Figure 458, view of the interior of the shell; 458 a, profile view. 
PareLia (Lortia?) aRangosa (Gould). 
Testa parva, tenuis, depresso-conica, sub-equilaterals, levis, paliide vires- 
cens, ramulis rubiginosis araneosis reticulata: facies interna allida ; 
margine simplict, acuto; limbo marginal planulato, rubiginoso, radt- 
coso. 
Patella (Lottia?) araneosa, Goutp ; Proceed. Boston Soc. Nat. Hist., 
ii. 152. July 1846. Expedition Shells, 10. 
SHELL small, thin, rounded, slightly elevated, smooth, and without 
ribs or sculpture ; apex nearly central, obtuse. Colour pale yellowish- 
green, reticulated with very fine rusty-brown lines, branching off like 
rootlets towards the margin. ‘The interior is whitish, with a rusty 
ring just within the muscular impression ; the edge is sharp and simple, 
and has a well-defined limbus, so thin as distinctly to repeat the ex- 
ternal linear markings. 
