PLATE CX, 

 SOLEN MARGINATUS. 



MARGINATED RAZOR SHELL* 

 GENERIC CHARACTER. 



Bivalve, with equal valves, oblong, open at both ends. At the 

 hinge a subulated tooth turned back, often double ; not inserted in 

 the opposite shell. Animal an ascidia. 



SPECIFIC CHARACTER 



AND 



SYNONYMS. 



Shell straight, of equal depth, a single tooth in each valve. 



Solen Marginatus : testa lineari recta marginata, valvulis un- 



dentatis. 

 Solen Vagina, Sheath, Penn. Br.Zool. p. 83. No. 21. 



Some Conchologists imagine that Da Costa has confounded this 

 species with his Solen Siliqua, but it is more probable that he had 

 •never met with it, or the character of the teeth at the hinge could 

 not have escaped his notice. In its general appearance it is not un- 

 like Solen Siliqua, but has one end marginated, and only a single 



A 4 



