THE BEACHIOPODA. 2l 



is really Tereb. simplex. This species occurs in tlie Murchisonso 

 zone, and is rather scarce. 



Localities. — Bradford Abbas and Marston Eoad (Dorset) ; also 

 near Cheltenham (Grloucestershire). 



14. — Terebratula (Epithyris) curvifrons, Oppel. 



1856. Terebratula curvifrons, Oppel, Juraformation, page 

 423, No. 212. 



1872. ,, (Ep.) curvifrons, JE. Besl, Brach. Jurass., 



plate 49. 



1878. Waldiieimia curvifrons, Davidson, British Brach. 

 Palaeont. Soc. Sup., plate xxiv., figure 33 

 (corrected in text to Terebratula.') 



The shell that I place under this designation is the one figured 

 by Mr. E. Deslongsehamj)s and Mr. Davidson in the references 

 quoted above, and which is found here in the Murchisonoczone, and 

 in the same zone in Gloucestershire and Normandy. Dr. Oppel's 

 description, however, scarcely seems to i^oint to the shell figured 

 by E. Deslongschamps. He says that his species comes between 

 ler. carinata and Ter. resupinata, has a broader sinus than the 

 last, and comes from the base of the Parkinson! zone.*' I have 

 not had opportunity to work it out, and so leave it, merely 

 pointing to this description. It evidently wants some investiga- 

 tion. 



Mr. E. Deslongschamps places this species and also Ter. pro- 

 vincialis into the subgenus Epithjris. Several subgenera are well 

 illustrated in the beginning of his work. Epithyris seems to 

 have a shorter and different loop to Terebratula, and also two 

 dark lines on the smaller valve, which commencing at the beak 

 and diverging slightly run to somewhat more than half-way down 

 the shell. I have specimens of the species illustrating this. 



Tereb. curvifrons varies slightly, but not to any great extent. 

 It is most like large Walcl. carinata with a deeper sinus. 



Dimensions. — Length 19, breadth 18, depth 9 lines. 



* Dr. Oppel Juiaformation, page 423, No. 212. 



