22S 



plications, which end roiiglily, or in jterfcct .specimens are 

 produced into s|)ines projecting- bevond the p-owth lines. 



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

 Section ."> (al)undant; one s})ecinien was found above this). 



Genus VITULIXA. Hall. 



[Ety. : Mythological uamc] 



(1860: 13th Kcp't N. Y. State Cab. Nat. Hist., p. 72. 1898: Pal. N. V.. 

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



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

 niakin<i- the oreatest diameter of the valve. Pedicle valve 

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

 center Iw an open delthyrium. Blunt, thick teeth, unsup- 

 ported l)v lamella:', are present. Bi'achial valve fiat or very 

 j2;ently 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. 



ViTULix.\ PLSTULOs.i. Hall. (Fig. 138.) (Pal. N. Y.. AOl. 

 IV., p. 410, PI. LXn.) 



Distiim-uishing Characters. — Size; rounded plications; ele- 

 vated fold, with depression in thecenter on the ])edicle valve; 

 corresponding sinus with a simple or double low plication in 





^Sfr-^SB^ 



Fio. 138. Vitulina piistulosa. Dorsal, ventral, profile, and cardinal views, and interior> 

 of pedicle and brachial valves, enlarged, .x 2 (from Hall). 



