196 BuivIvBTiN 31 196 



Ivongeur du fragment 7 mill. ; largeur 4 mill. 



Cette espdce tr^s int^ressante se distingue de E. cladarus du bassin de 

 Paris, par son bord cardinal plus rectiligne et par sa dent antdrieure plus 

 allongee ; I'impression musculaire prend naissance plus pr^s du bord an- 

 terieur, comma dans le genre Cultellus, mais elle s'6tend obliquement 

 comme celle d' Ensiculus cladarus, quoiqu'elle soit moins pr^s de la char- 

 niere. Claiborne, ma collection. 



Dall remarks regarding this species: "Specimens of this 

 small species have been obtained by Burns and Johnson, but 

 mostly- in a fragmentary condition. It is easily recognized by 

 the curved ridge in front of the anterior scar. 



There are no specimens of this species worthy of illustra- 

 tion in our collections. 



Siliqua simondsi Harris, PI. 59, Fig. 4 



5. simondsi Harris, Proc. Phila. Acad. Nat. Sci., 1895, p. 51, pi. 3, 



fig. 2. 

 kS. simondsi Dall, Trans. Wag., Ill, 1900, p. 956. 



Harris'' oHginal description. — Size and general form as indicated by 

 the figure ; anterior acutely rounded sub-basally, posterior rounded ; from 

 the umbo radiate two depressions (in the cast), the anterior deep, the pos- 

 terior more nearly vertical and faint ; pallial line and sinus comparatively 

 well marked. 



Type. — Texas State Museum. 



//(7rz>^;z.— Jackson ? Eocene. 



Locality of only specimen known. — Dr. Williams' Quarry, 

 Stephenson's Headright, Brazos Co., Texas. 



More material must be collected before the generic position 

 of this species can be definitely determined. 



Martesia texana Harris, PI. 59, Fig. 5 



M. texana Har., Proc. Phila. Acad, Nat. Sci., 1895, p. 53, pi. 3, fig. 6. 

 M. texana Dall, Trans. Wag., Ill, 1895, p. 820. 



Harris' original description. — General form as figured ; surface 

 marked by concentric lines or corrugations crossed by a radiating fold ; 

 anterior to this the lines are strong, but behind it they are very faint. 



This speceis differs from M. elongata Aid. , by its much greater anter- 

 ior development, and hence the much more central position of the radiating 

 fold. 



