OF CONCHOLOGY. 109 



Waldheimia venosa, Sol. Plate viii, fig. 8 and 11. 



Anomia venosa, Sol. MSS. Mus. Banks. Dixon's Voj. p. 



355, pi. xi, 1788. Dav., Ann. and Mag. Nat. Hist, xx, 



p. 81—83. 

 Terehratida glohosa, Lam., An. s. Vert, v, vii, p. 330. Rve., 



Conch. Icon. pi. ii. fig. 3 a, b, c, pi. vi, fig. 3 d, e. Jour. 



de Conchyl. 1861, p. 122. 

 Terehratida californica, Sby., Auct. (non Koch). 

 Waldheimia dilatata, Lam., Rve., Conch. Ic. pi. ii, fig. 2, pi. 



vi, fig. 2 b, 2 c. 

 Terehratula Gaudichaudi, Blainville (teste Rve). 

 Waldheimia physema, Val., Rve., Conch. Ic. vi, fig. 25 a, b, c. 

 Terehratida eximia, Philippi (teste Rve.) 

 Terehratida Kochii, Kust., Conch. Cab. 

 Terehratula Fo7itaineana, D'Orb., Voy. Am. Mer. v. p. 675, 



No. 782 ; ix, pi. 85, fiig. 30, 31. 



ITah. Orange Harbor, Tierra del Fuego. U. S. Ex. Ex. 

 Smithsonian Cabinet, 17,813. 



Of the shells submitted to Mr. Reeve for examination, col- 

 lected by the U. S. Exploring Expedition, fifteen specimens were 

 returned by him under this name. Externally they presented 

 no differences among themselves except in size and coloration. 

 An examination of the apophyses showed that, of the whole num- 

 ber of specimens, three belonged to a different genus, while ten 

 retained no remains of the apophyses. The latter, probably, and 

 the two perfect specimens, certainly, were correctly determined. 



This shell does not agree with Sowerby's description as given 

 in the Br. Mus. Cat. p. 59. 



In all the specimens examined except one the foramen was 

 complete ; in that one a slight fissure existed, seemingly the re- 

 sult of erosion. This character, however, is by no means to be 

 relied upon, as it is not constant in many of the species. 



The apophyses are very slender and narrow, a breath almost 

 being sufficient to destroy them. The cardinal process is very 

 prominent, and terminates in two rounded knobs. 



The beautiful red, vein-like markings, present in most of the 

 specimens, are simply the remains of the ovaria. They are en- 

 tirely composed of animal matter, and may be washed entirely 

 away with water. Hence they cannot be relied upon as a diag- 

 nostic, though much more permanent than the remainder of the 

 animal matter. 



The form of the shell varies from elongate oval to nearly 

 circular, with or without an anterior flexure. 



