10 
LORQUINIA 
Macron Lividus, A. Ad. Some of the shells were developed, filling the 
cases quite full, so I feel certain they would soon have broken out. 
These cases were similar in substance to those described above 
and were oval in shape, about 5 mm. in height by 3>^ mm. wide and 
the ones containing shells were quite thick. The shells taken from 
these egg-cases are 2 to 3 mm. tall and are the same shape as the ma- 
ture shell. They are composed of two whorls, the first or nuclear is 
nearly white and shows a few revolving striae; the second is covered 
with a very thin light brown epidermis and shows about 18 revolving 
striae between the suture and the closed umbilicus; these striae are 
crossed by numerous very fine growth lines. 
In both the above instances the egg-cases were found singly. This 
is quite different from the habit of some other mollusca, Tritonalia 
poulsoni and Purpura nuttallii depositing their egg-cases in large 
groups. I have seen four or five specimens of Tritonalia poulsoni de- 
positing their egg-cases in one large group, covering a space of three 
or four inches in diameter. 
E. P. CHACE. 
A RARE CAT-TAIL 
I have recently come upon a number of specimens of Typha angus- 
tifolia, the narrow-leaved cat-tail. This species is noted by Professor 
Abrams, in his Flora of Los Angeles and vicinity, as being found in 
places similar to those in which T. latifolia, the broad-leaved or com- 
mon cat-tail grows, but he notes it as "not common." T. angusiifolia 
differs from T. laiifolia in having narrower leaves and a longer and nar- 
rower spike, which constitutes the "tail." This spike consists of a 
great number of small flowers, of which the upper contain stamens but 
no pistils, while the lower contain only pistils. In T. laiifolia the parts 
of the spike which contain these two kinds of flowers are usually not 
separate, but intergrade, while in T. angusiifolia there is a gap in the 
spike, dividing it into two distinct segments. 
The specimens referred to above were found along the Arroyo 
Sacatella (a marshy creek) about fifty feet south of Wilshire Boule- 
^'ard, opposite Normandie Avenue, in Los Angeles. 
CHARLES F. RICHTER. 
Los Angeles, Cal. 
