540 CRETACEOUS PALEONTOLOGY. 



true members of the genus Veniella, is the internal, transverse, 

 ridge-like thickening of the shell at the dorsal margin of the 

 anterior muscular impression, a character which is probably of 

 generic value and which is present also in the cast identified by 

 Whitfield as V. decisa. Both these species have strongly enrolled 

 beaks, a character in which they simulate members of the genus 

 Isocardia, and they resemble, both in their general form, their 

 strongly enrolled beaks, and in the transverse thickening of the 

 shell mentioned above, a shell which is described by Wood as 

 Iso'orca agcDssim^ P. & R., from the Cretaceous of England. It 

 is possible that they should be referred to the genus Isoarca, but 

 they show no evidence of having had any Area-like teeth, and 

 before so referring them they should be carefully compared with 

 the type of that genus. 



Formation and locality. — Manasquan marl, near New Egypt, 

 Farmingdale. 



Geographic distribution. — New Jersey. 



Veniella 7 decisa (Morton). 

 Plate LVIII., Pigs. 25-26. 



1833. Cardita decisa Mort., Am. Jour. Sci., ist ser., vol. 23, 



p. 292; vol. 24, pi. 9, fig. 3. 



1834. Cardita decisa Mort., Synop. Org. Rem. Cret. Gr. U. S., 



p. 66, pi. 9, fig. 3. 

 1861. Cardita decisa Gabb, Synop. Moll. Cret. Form., p. 160 



(104). 

 1886. Veniella decisa Whitf., Pal. N. J., vol. i (Monog. U. S. 



G. S., vol. 9), p. 145, pi. 19, figs. 15-16. 



Description. — "Shell of medium size, subquadrangular, rhom- 

 boidal or triangularly rhombic in outline, dependent more or 

 less on compression or distortion of the valves. Valves usually 

 very ventricose, with strong, rather inflated and enrolled beaks, 

 situated near the anterior end and curved anteriorly, and strongly 

 angular 011 the back; umbonal ridge distinctly and prominently 



' Monog. Cret. Lam. Eng., p. 65, pi. 13, figs. 7 a-b. 



