278 SOLEKACEA. 



gallery.) Fam. Turbinacea. Lam. Goniostomata, Bl. — Descr. 

 Discoidal beneath, conical above, with a wide umbilicus, the 

 spiral margin of which is angiJated and crenulated ; aperture 

 trapezoidal ; peritreme thin, sharp ; columella straight ; opercu- 

 lum horny, subspiral. — Obs. The Solarium Perspectivum, is 

 . commonly called the Staircase 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 numerous, they belong to tropical 

 climates. A few fossil species occur in the tertiary formations. 

 S. Perspectivum. PI. xvi. fig. 853. 



SOLDIANA. D'Orb. A genus of microscopic Poraminifera. 



SOLEJN". Auct. {A kind of shell-fish, Plin.) Fam. Solenacea, 

 Lam. Pyloridea, Bl. — Desc. Bivalve, transversely elongated, 

 sub-cylindrical, equivalve, very inequilateral, gaping at both 

 extremities, umbones terminal, close to the anterior extremity ; 

 hinge linear, with several small cardinal teeth, and a long exter- 

 nal ligament ; muscular impressions distant, anterior, tongue- 

 shaped, placed behind the cardinal teeth, posterior irregular, 

 sub-ovate ; paUeal 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. They are found buried deep in the 

 sand, in a perpendicular position, their situation being pointed 

 out by a dimple, on the surface. They are abundant in tem- 

 perate climates. Some of the Lamarckian Solenes will be found 

 in the genus Solenocurtus, Bl. PI. ii. fig. 60, 61. 



SOLEKACEA. Lam. A family of the order Conchifera, 

 Dimyaria, Lam. The shells belonging to it are described as 

 transversely elongated, destitute of accessary pieces, gaping 

 only at the lateral extremities ; ligament external. — The genera 

 may be thus distinguished. 



1. SoLEisr. Eazor shells, truncated at the extremities. Pig. 60. 



2. PANOPiEA. Bi'oad, with prominent tooth. Pig. 65, 66. 



3. SoLENOCUETUS. Eouudcd at the extremities, with inter- 



nal bar. Pig. 61. 



