SOLENELLA. 261 



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 ; 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. 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 temperate climates. 

 Some of the Lamarckian Solenes will be found in the genus Solen- 

 ocurtus, Bl. Fig. 60, 61. 

 SOLENACEA. Lam. A familyof the order Conchifera, Dimyaria 

 Lam. The shells belonging to it are described as transversely 

 elongated, destitute of accessary pieces, gaping only at the late- 

 ral extremities ; ligament external. — The genera may be thus 

 distinguished. 



1. Solen. Razor shells, truncated at the extremities. Fig. 60. 



2. Panop^ea. Broad, with prominent tooth. Fig. 65, 66. 



3. Solenocurtus. Rounded at the extremities, with internal 



bar. Fig. 61. 



4. Solenimya. No teeth, epidermis over-reaching the shell. 



Fig. 68. 



5. Glycimeris. Thick, fulcrum of the ligament prominent. 



Fig. 67. 



6. Lepton. Flat, scale-shaped. Fig. 62. 



7. Novaculina. Umbones nearly central; covered by a thin 



epidermis. Fig. 63. 



8. Glauconome. Oval, margins close. Fig. 64. 

 SOLENELLA. Sow. (Solen.) Fam. Arcacea, Lam. — Bescr. Oval, 



equi valve, 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 few specimens of the only species 



