STANTON.] 



VENERID^. 107 



urements of another specimen, that is much more convex than any of 

 the others, are: Length, 44"' m ; height, 3G m " • convexity, 18 ,nm . Other 

 examples are somewhat larger than either of these. 



This species would probably be included in Cyprimeria as extended 

 and defined by Zittel in the Handbuch der Palaeontologie, but it differs 

 from the typical species of that genus in that it is equivalve, its valves 

 are not twisted, and its pallia! sinus is deep. The hinge resembles that 

 of Cyprimeria in a general way, especially if the two anterior teeth of 

 the right valve be regarded as one bifid tooth. Venus faba Sow., which 

 is apparently a closely related form showing precisely the same generic 

 characters, has been referred by some authors to Cyprimeria, but Holz- 

 apfel 1 has recently regarded it as a Tapes, and after comparing the 

 Colorado fossils with recent species of that genus the reference seems 

 to me a natural one. 



Locality and position. — In the Pugnellns sandstone on Williams 

 creek, Muddy creek, and Poison canyon, Huerfano park, Colorado. 

 Casts that are believed to belong to this species have been found in 

 the " first ridge" at Coalville, Utah. 



Genus LEGUMEN Conrad. 



This genus was described in 1858 2 and the description was supple- 

 mented in I860 3 after the hinge of both valves bad been studied. The 

 type is Legumen ellipticum, from the cretaceous beds near Ripley, Miss- 

 issippi. 



It has always referred to the Solenidre, but in form and in the details 

 of the hinge it agrees very closely with Tapes fragilis (d'Orb.), audi 

 believe that it is congeneric with that species which is the type of Stol- 

 iczka's genus Baroda. If this proves to be true Baroda, being a later 

 name, should be treated as a synonym. 



In Tryon's Structural and Systematic Conch ology, vol. Ill, p. 132, 

 this genus is erroneously called Legnmenaia Conrad. 



Legumen, sp. 

 PI. xxiv, Fig. 11. 



In the Pugnellus sandstone in Poison canyon, Colorado, a single 

 specimen was found that probably belongs to this genus. It is a cast 

 of a left valve retaining a little of the shell near the dorsal margin, but 

 it does not show the structure of the hinge nor the pallial line. 



In outline it is not very different from Baroda wyomingensis Meek, 

 from the upper portion of the Montana formation, and it is still more 

 nearly like the forms from the Ripley beds on which Conrad founded 

 his genus Legumen. 



>Die Mollusken d. Aachener Kreide, II. Abtheil., p. 165, PI. 13, Figs. 7-10, Palaeontographica, vol.35. 



2 Jour. Acad. Nat. Sci. Phila., 2d ser., vol. m, p. 325. 



3 Idem, vol. IV, p. 277. 



