2*^8 



plications, which end roughly, or in perfect specimens are 

 produeed into spines projecting beyond the growth lines. 



Found in the coral layer of the lower Moscow shale, at 

 - ction •"> ( abundant ; one specimen wns found above this |. 



Genus VITULINA. Hall. 



[Ety. : Mythological name.] 



0: L3th Rep't X. V. State Cab. Nat. Hist., p. 72. 1898: Pal. N. V.. 

 Vol. VIII., Pt. II., p. 138.) 



Shell rather small, plano-convex, transverse, the hinge line 

 making the greatest diameter of the valve. Pedicle valve 

 convex, with a well-developed cardinal area, divided in the 

 center by an open delthvrium. Blunt, thick teeth, unsup- 

 ported by lamellae, are present. Brachial valve flat or very 

 gently convex, with a narrow area divided as in the pedicle 

 valve. Cardinal process straight and simple. Surface cov- 

 ered with a few coarse plications. Brachidium consists of 

 loose spirals, the apices of which are directed towards the 

 lateral margins of the shell. 



Vitulixa pustulosa. Hall. (Fig. 138. ) (Pal. X. Y.. Vol. 

 IV.. p. 410, Pl.LXII.) 



Distinguishing Characters. — Size; rounded plications; ele- 

 vated fold, with depression in thecenter on the pedicle valve; 

 corresponding sinus with a simple or double low plication in 



* 



Fio. 188. VUulinti jmatulosa. Dorsal, ventral, profile, and cardinal views, and interiors 

 >.f iodide and brachial valves, enlarged, x 2 (from Hall). 



