20
SOLENID.E.
(judging from a comparison of authentic specimens with
the descriptions of those authors) are varieties of S.
siliqua, and only distinguishable by the absence or size
of some of their teeth. The present species is, the Hypog(Ba crinita of Poli, S. gladius of Bolten, and S. gladiolus of Gray.
C. Shell straight, tubular, and rather sohd ; hinge at one end,
and only furnished with a single lateral tooth in each
valve.
4. S. yagi'na*, Linne.
S. vagina, Linn. S. N. p. 1113. S. marginatus, F. & H. i. p. 242, pi. xiv.
f, 1, and (animal, siphon only) pi. I, f. 3.
Body cyhndrical, pale yellowish-brown : mantle thickened :
that of the upper one plain : (lills long, linear, orange-brown :
palps large, sharp-pointed : foot oblong, yellowish -white.
Shell exactly cylindrical, and of equal size throughout,
somewhat glossy, opaque : sculpture as in the preceding two
species : colour pale yellowish-brown (with an orange tint in
aged specimens), and marked with streaks of a darker hue in
the transverse line of growth : epidermis membranous, yellowish-brown : margins equally straight before and behind,
obliquely truncated at the anterior end, which is deeply, constricted (as if it had been tied while in a soft and plastic state
with a string), and transversely truncated or very slightly
curved at the posterior extremity ; dorsal area or compartment
not so distinct as in the other species : heaJcs inconspicuous,
separated by the constriction from the anterior end : ligament
very long and narrow, dark horncolour : hinge-line straight
hinge-plate long, strengthened by a rib in each valve to support
the ligament, and thickened at the anterior end : teeth, in each
valve a single wedge-like cardinal, resembling in shape the
leaf of a water-lilj^ and attached to the hinge by an obliquely
tT\isted stalk ; the tooth in the right valve is outermost : inside
* A sheath.
SOLENID.E.
(judging from a comparison of authentic specimens with
the descriptions of those authors) are varieties of S.
siliqua, and only distinguishable by the absence or size
of some of their teeth. The present species is, the Hypog(Ba crinita of Poli, S. gladius of Bolten, and S. gladiolus of Gray.
C. Shell straight, tubular, and rather sohd ; hinge at one end,
and only furnished with a single lateral tooth in each
valve.
4. S. yagi'na*, Linne.
S. vagina, Linn. S. N. p. 1113. S. marginatus, F. & H. i. p. 242, pi. xiv.
f, 1, and (animal, siphon only) pi. I, f. 3.
Body cyhndrical, pale yellowish-brown : mantle thickened :
that of the upper one plain : (lills long, linear, orange-brown :
palps large, sharp-pointed : foot oblong, yellowish -white.
Shell exactly cylindrical, and of equal size throughout,
somewhat glossy, opaque : sculpture as in the preceding two
species : colour pale yellowish-brown (with an orange tint in
aged specimens), and marked with streaks of a darker hue in
the transverse line of growth : epidermis membranous, yellowish-brown : margins equally straight before and behind,
obliquely truncated at the anterior end, which is deeply, constricted (as if it had been tied while in a soft and plastic state
with a string), and transversely truncated or very slightly
curved at the posterior extremity ; dorsal area or compartment
not so distinct as in the other species : heaJcs inconspicuous,
separated by the constriction from the anterior end : ligament
very long and narrow, dark horncolour : hinge-line straight
hinge-plate long, strengthened by a rib in each valve to support
the ligament, and thickened at the anterior end : teeth, in each
valve a single wedge-like cardinal, resembling in shape the
leaf of a water-lilj^ and attached to the hinge by an obliquely
tT\isted stalk ; the tooth in the right valve is outermost : inside
* A sheath.