MOLLUSCOIDEA. 353 



1864. Escharinella muralis Meek, Check List Inv. Foss. N. A., 



Cret. and Jur., p. 3. 



1868. Escharinella muralis Con., Cook's Geol. N. J., p. 722. 

 1905. Escharinella muralis Johns., Proc. Acad. Nat. Sci. Phil. f 

 1905, P- 5- 



Description. Zoarium composed of flattened, rather narrow, 

 irregularly dividing- branches, with from four to eight rows of 

 zocecia upon each side. Zocecia subrhomboidal, their outer sur- 

 face smooth, slightly convex, more depressed at the proximal 

 than at the distal end, the adjacent ones often separated by a 

 very slight raised line in the bottom of the depression formed 

 by the meeting of the convex surfaces. Zocecial apertures small, 

 terminal, sometimes rounded anteriorly with the proximal margin 

 straight, sometimes subquadrate, often with a small tooth-like 

 projection directed forward from the proximal margin. Avicu- 

 laria small, circular, equal in number to the zooecia, situated just 

 in advance of and close to the zooecial apertures. 



Formation and locality. Vincentown limesand, Vincentown 

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



Geographic distribution. New Jersey. 



Mucronella typica (Gabb & Horn). 



Plate XXVI., Figs. 12-13. 

 1860. Cellepora typica G. & H., Proc. Acad. Nat. Sci. Phil., 



1860, p. 366. 

 1860. Cellepora typica Gabb, Jour. Acad. Nat. Sci. Phil., 2nd 



ser., vol. 4, p. 400, pi. 69, fig's. 27-29. 

 1862. Escharifora typica G. & H., Jour. Acad. Nat. Sci. Phil., 



2nd ser., vol. 5, p. 134, pi. 19, fig. 16. 

 1864. Escharifora typica Meek, Check List Inv. Foss. N. A., 



Cret. and Jur., p. 3. 



1868. Escharipora typica Con., Cook's Geol. N. J., p. 722. 

 1905. Escharifora typica Johns., Proc. Acad. Nat. Sci. Phil., 



1905, P- 5- 



Description. Zoarium incrusting in its early stages of growth, 

 later rising in free, flattened, bifoliate branches, which divide 

 more or less irregularly, usually in one plane, but sometimes 

 23 PAL 



