HORNERID^, PETALOPORIDJ5. 
303 
DrSTRIBUTIOX. 
Upper Cretaceous : Pulaski County, Arkansas. 
D. 5297. Three broken branches, 2*5-3 mm. in diameter ; the largest is 10 mm. 
long. Upper Cretaceous. Pulaski County, Arkansas. Ulrich Coll. 
6. Petalopora parvicella (Gabb & Horn), I860. 
Synonymy. 
Multicrescis parvicella, Gabb A Horn, 1860. Cret. Cor. N. Jers. : Proc. Acad. 
Nat. Sci. Phil. p. 367. 
,, ,, Gabb, 1860. New Amer. Tert. Cret. Foss. : Journ. 
Acad. Nat. Sci. Phil. ser. 2, vol. iv. p. 401, pi. 69, 
tigs. 36-8. 
,, ,, Gabb k Horn, 1862. Mon. foss. Polyz. : ibid. vol. v. 
p. 178, fig. 70. 
,, ,, Johnson, 1905. Annot. List: Proc. Acad. Nat. Sci. 
Phil. vol. Ivii. p. 5. 
Diagnosis. 
Zoarium of narrow, cylindrical, dichotomous branches. Apertures 
raised and widely spaced ; numerous small maculae scattered 
over the wide, smooth areas between the apertures. 
Distribution. 
Senonian — Maastrichtian : Yincentown, New Jersey. 
Affinities. 
This species is represented in the Museum Collection by four 
small fragments (D. 5298), which are about 1*5 mm. in diameter. 
The species is a Petalopora. 
D. 5298. Four fragments of branches. Upper Cretaceous. Yincentowu, New 
Jersey. Ulrich Coll. 
Yol. I. p. 383. Add to Petalopora striato-punctata (Hag.): 
Syn. ? Eschara biserialis, von Reuss, 1854. Kreidesch. Ostalp. : Denk. Akad. 
Wiss. AYien, vol. vii. p. 136, pi. xxxvii. tig. 8. 
Distrib. — Coniacian — Rudisten Mergel : Nefgraben, near Gosau, Upper 
Austria. 
This species, to which my attention has been called by Mr. Lang, was well 
described and figured by von Reuss. It belongs to the series of P. costata, but 
differs therefrom by the greater regularity of its apertures, which occur in a 
regular spiral. As in P. costata, the macul® are usually biserial, with occasional 
additional maculae. It agrees with P. striato-punctata by its flattened branches 
and conspicuous longitudinal ribbing, but the information regarding that species, 
given by its founder, is inadequate for the certain identification of the two species. 
