MOLLUSCOIDEA. 329 



1868. Retelea ovalis Con., Cook's Geol. N. J., p. 723. 

 1905. Retelea ovalis Johns., Proc. Acad. Nat. Sci. Phil., 1905, 

 p. 6. 



Description. Zoarium consisting of irregularly anastomo- 

 sing, vertical, bifoliate lamellae about .25 mm. in thickness, the 

 openings between the lamellae being exceedingly irregular with 

 widths varying from I mm. to 4 mm. The entire zoarium forms 

 masses 5 mm. to 10 mm. in thickness, sometimes of considerable 

 lateral extent. Zocecia occupying both sides of the vertical 

 lamellae and somewhat regularly arranged in vertical and diag- 

 onal lines. The apertures oval or elliptical, somewhat variable 

 in form, closed in the old zocecia by a flat, smooth operculum 

 which is separated from the rim of the aperture by a slightly 

 depressed ring. The spaces between the apertures usually regu- 

 larly depressed. 



Remarks. This species can always be easily recognized from 

 the habit of growth of the zoarium, it being different in this 

 respect from any of its associates. 



Formation and locality. Vincentown limesand, Vincentown 

 (154), near Mullica Hill (Gabb and Horn). 



Geographic distribution.. New Jersey. 



:f 



Order CHILOSTOMATA. 



Family ONYCHOCELLIDAE. 



Genus FLUSTRELLA d'Orbigny. 



Flustrella ? capistrata Gabb and Horn. 



Plate XXIII., Figs. 5-6. 



1862. Flustrella capistrata G. & H. Jour. Acad. Nat. Sci. Phil., 



2nd ser., vol. 5, p. 161, pi. 20, fig. 48. 

 1862. Membranipora abortiva G. & H., Jour. Acad. Nat. Sci. 



Phil., 2nd ser., vol. 5, p. 157, pi. 20, fig. 41. 

 1864. Membrampora abortiva Meek, Check List Inv. Foss. N. 



A., Cret. and Jun, p. 3. 

 1864. Flustrella. capistrata Meek, Check List Inv. Foss. N. A., 4 



Cret. and Jur., p. 4. 



