The Lucinas 



oblong, with a straight, spinose dorsal margin, occurs in deep 

 water of the Gulf of Mexico. 



Genus SOLENOMYA, Lam. 



Shell obliquely elongated, equivalve, resembling a razor clam; 

 fingers of horny periostracum prolong the ribs of the shell con- 

 siderably beyond its margin; ligament internal, hinge without 

 teeth; mantle closed except where the siphon and foot emerge; 

 foot snout-like, with a toothed disk at the end; siphon with two 

 long tentacles at orifice. A single genus of few species in the 

 family. 



The Little Solenomya (5. velum, Say), unmistakable with 

 its notched or fingered extension of horny epidermis over-reaching 

 the plain shell margins, has broad, fiat ridges radiating from its 

 hinge at one corner of the oblong shell. Length scarcely an inch. 



Habitat. — Nova Scotia to Cape Hatteras. 



Johnson's Solenomya (5. Johnsoni, Dall) was dredged in 

 water from one to two miles deep by collectors on the Albatross. 

 It is a remarkable shell, with horny fingers equal in length 

 to the width of the shell. This species has been taken at various 

 points from Puget Sound southward. Length, 4 to 5 inches. 



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