MORSE: OBSERVATIONS ON LAMELLIBRANCHS. 107 
b, 5.5 millimeters in length; c and d are dorsal views. The 
protoconch is circular in shape, tlie ligament in d shows delicate 
lines of growth and is white in color. It would be extremely 
interesting to secure a live specimen of this species and examine 
the expanded syphons. 
Since the above lines were written I secured a living specimen 
through the kindness of Major John M. Gould. The specimen 
was dredged in Portland Harbor by a huge machine employed 
in deepening the channel. The expanded animal presented a 
remarkable appearance. The mantle and bulbous syphonal end 
were extended far beyond the edge of the shell, as shown in 
Fig. 24, €. The globular enlargement surrounding the syphons 
has a deep vertical furrow or groove on its posterior surface, at 
the bottom of which are the syphonal openings in a double 
gourd-shaped area, slightly pinkish in color. Contrary to the 
condition in other lamellibranchs thus far studied, with the 
exception of Anatina papyracea, the anal syphon is larger in 
diameter than the branchial one. The valve is short and its 
walls rather thick and opaque, surrounded by papillae, long and 
short ones alternating, white in color. The branchial syphonal 
opening is small and surrounded by long slender papillae crowded 
together and curving inward. The bulbous enlargement is light 
tawny brown in color, becoming darkened and roughened near 
the openings. The whole appearance indicates that the syphons 
must extend to a great length, perhaps three times the length of 
the shell. The openings would then appear quite different if 
extended, but though the specimen studied had been in a pan of 
salt water for two weeks no indication of expansion was detected. 
The shells w'idely gape, resting on the soft parts like a saddle. 
The mantle is perforated at the dorsal anterior end for the foot, 
which is long, somewhat carinated, and capable of extending up 
and down in various directions. With the exception of the 
pedal opening and the s^^phonal openings, the mantle is closed. 
The mantle seen from below forms a strong integument and the 
epidermis of the shell continues and covers the mantle. A 
peculiar feature is seen in a distinct furrow running along the 
median line from the back of the bulbous sj'phonal dilatation to 
the ventral portion and round the anterior end to the pedal 
opening. The shells are widely gaping from the beak to the 
