SOLENOCURTUS. 99 
Trochus, from the angulated edges of the whorls being seen 
through the umbilicus, which reaches to the apex, and presents 
the appearance of a winding gallery. The species are not nu- 
merous, they belong to tropical climates. A few fossil species 
occur in the tertiary formations. Fig. 353, S. perspectivum. 
SOLDA'NIA. D’Orb. A genus of microscopic Foraminifera. 
SO’'LEN. Auct. (A kind of shell-fish, Plin.) Fam. Solenacea, 
Lam. Pyloridea, Bl. Descr. Bivalve, transversely elongated, sub- 
cylindrical, equivalve, very inequilateral, gaping at both extre- 
mities ; umbones terminal, close to the anterior extremity ; hinge 
linear, with several small cardinal teeth, and a long external 
ligament; muscular impressions distant, anterior tongue-shaped, 
placed behind the cardinal teeth, posterior irregular, sub-ovate ; 
palleal impression long, bilobed posteriorly. Obs. The above 
description of the genus Solen, is framed so as to admit only 
those species which are commonly called Razor shells, with the 
umbones terminal, and the anterior muscular impression behind 
them. Some of the other Lamarckian Solenes, will be found in 
the genus Solenocurtus, Bl. Fig. 60, 61. 
SOLENA’CEA. Lam. A family of the order Conchifera Dimya- 
ria, Lam. containing the genera Solen, Panopza, Glycimeris, 
and others enumerated in explanation of figures 60 to 68. 
SOLENEL'LA. Sow. (Solen,dim.) Fam. Arcacea, Lam. Descr. 
Oval, equivalve, subequilateral. compressed, covered with a thin, 
shining, olive green epidermis; hinge with three or four anterior, 
and numerous sharp posterior, lateral teeth, arranged in a straight 
line; muscular impressions two, lateral; palleal impression with 
a large sinus; ligament external, prominent, elongated. Obs. 
This genus partakes of the characters of the genus Nucula, and 
of the family Solenacea. A fews pecimens of the only species 
known (5S. Norrisii, fig. 138,) were dredged by Mr. Cuming, at 
Valparaiso. 
SOLENIMY’A. Auct. (Solen and Mya.) Fam. Mactracea, Lam. 
Pyloridea, Bl. Deser. Equivalve, inequilateral, transversely 
oblong, rounded at the extremities, with the umbones near the 
posterior side, covered with a shining brown epidermis, extend- 
ing beyond the edges of the shell; hinge without teeth; liga- 
ment partly internal, placed in the margin of an oblique, flattish, 
posterior rib; muscular impressions two, distant, lateral. Obs. 
Solenimya differs from Solenocurtus and the Solens, in having 
the posterior part of the shell shortest; in the internal ligament ; 
and in being destitute of teeth. It resembles Glycimeris, but is 
not incrassated. Fig. 68. 
SOLENOCUR'TUS. Bl. (Solen and Curtus, short.) Fam. Pylo- 
ridea, Bl. Solenacea, Lam. Descr. Oval, Elongated, equivalve, 
sub-equilateral, with the edges nearly straight and parallel, and 
the extremities rather truncated ; umbones not very prominent, 
