19 
182 Lunatia lewisii Glid 
Rare; apparently common in deep water and farther south. 
183 Sigaretus debilis Gld 
I have a single broken individual from San Diego, and another 
from Todos Santos bay. 
184 lLamellaria diegoensis 
False bay at low water, April and May; rare. When living 
the soft parts completely cover the shell and are, in part, of a 
vivid red color similar to that of Doris sanguinea, 
[Soft parts as contracted in alcohol about .65 inch in length, 
above smooth or nearly so, dull white or grayish, beneath lighter 
colored; form rounded oval, a well-marked notch in the mantle 
edge (notaeum) a little to the left of the middle line in front; 
foot rather large, rounded behind, nearly transversely truncate 
in front with rounded corners and the front margin deeply 
grooved or double; head dark gray above, flattened; tentacles ob- 
tusely tapering, somewhat flattened; eyes large and black, on 
tubercles outside of the bases of the tentacles; mouth hidden un- 
der the head, small; verge extremely large, broad, flattened, ex- 
tending forward beyond the head, curved to the left in a broad 
ascending spiral; smooth below, granulous above with a short line 
of elevated papille inside the edge of the outer part; beyond the 
curve is an indentation on the left side behind which is a stout 
conical papilla from the apex of which extends upward a slowly 
tapering cylindro-conic tubular portion; the nuchal cavity is pro- 
longed backward under the anterior edge of the immersed shell; 
shell calcareous except the immediate margins of the aperture, 
grayish waxen white, slightly irridescent with a mucilaginous 
polish like dry glue inside and out, somewhat malleated, with in- 
dications of the lines of growth by obscure slightly elevated trans- 
verse waves and faint irregular spiral tracings; three-whorled, 
very much inflated, though the form varies slightly between indi- 
viduals and probably between the sexes; nucleus small, smooth; 
suture deep, not channeled; spire pervious from below; columella 
less calcareous than the shell in general, without callus or any 
thickening, twisted into an open spiral, continuous with the outer 
lip in front only; aperture very oblique, subquadrate. Alt. 15; 
max. lat., 17; long. of aperture, 12; lat. of aperture, 19 mm, 
This shell was first received from Mr. Henry Hemphill of San 
Diego; subsequently other specimens came to hand from Cape 
St. Lucas. As will be seen from the characters of the soft parts, 
it is a true Lamellaria (Marsenia, Leach, is a later and synony- 
mous name). It is more inflated and elevated than any European 
or West American form known to me. 
Lamellaria stearnsii Dall (1871) is a depressed and much 
more calcareous species, which has the soft parts translucent 
white, and the shell distinctly finely striated. Lamellaria rhom- 
bica Dall proves to be a Marsenina, though the shell does not 
greatly differ from that of L. stearnsii, and should take the name 
of Marsenina rhombica. The two forms of L. stearnsii, one of 
which was described as a variety orbiculata, may turn out to be 
sexually distinct, as the differences are such as mark the two 
sexes of the common British species according to Jeffreys. Both 
the just mentioned forms, as well as Marsenina rhombica, were 
collected at Monterey; while L. diegoensis seems to belong to the 
southern fauna. D.] 
