264 Trans. Acad. Sci. of St. Louis. 



Paraphorhynchus transversum n. sp. 



PI l,f. 12-15. 



1895. Pugnax missouriensis, Hall and Clarke, Pal. N. Y., 

 vol 8, pt. 2, pi. 62, figs. 44-45. (Not Rhynchonella 

 missouriensis Shumard, 1855.) 

 1900. Pugnax striaticostata var.?, Weller, Ann. Rep. la. 

 Geol. Surv., vol. 10, p. 71. (Not Rhynchonella 

 striatocostata M. & W., 1868.) 

 1900. Pugnax striaticostata var.?, Weller, Trans. St. Louis 



Acad. Sci., vol. 10, p. 72, pi. 2, figs. 16-17. 

 Wider than long, the pedicle valve much less convex than 

 the brachial, the fold and sinus originating on the umbo, 

 nearly at the beak. In the number and form of its radiating 

 plications and striations this species closely resembles P. 

 striatocostatum, but its proportionate width is always greater 

 than that species and it attains a larger size at maturity The 

 dimensions of a nearly perfect specimen from Burlington, 

 Iowa, are : length 24.5 mm., width 30 mm., thickness 21 mm. 

 The average rostral angle of five specimens is 114.5°. 



Localities. This species occurs in the yellow sandstone of 

 the upper portion of bed No, 2 of the Kinderhook section at 

 Burlington, Iowa, where it is a member of the Chonopectus 

 fauna. It also occurs in the yellow Kinderhook sandstone at 

 Kinderhook, Illinois, in a bed about 25 feet below the summit 

 of the formation, and in the English River grit, at Maples' 

 Mill, near Wellman, Washington County, Iowa. 



EXPLANATION OF PLATE. 



Paraphorhynchus elongatum n. sp., Figs. 1-2, pedicle and brachial views 

 of one specimen. Figs. 3-4, similar views of another specimen. Fig. 5, 

 lateral view of a third specimen. All from Knox County, Missouri. 



Paraphorhynchus striatocostatum (M. &W.), Figs. G-8, pedicle, brachial 

 and anterior views of a specimen from Pike County, Illinois. Figs. 9-11, 

 pedicle, brachial and lateral views of a specimen from bed No. i, at Bur- 

 lington, Iowa. 



Paraphorhynchus transversum n. sp., Fig. 12, a pedicle valve from Kinder- 

 hook, Illinois. Figs. 13-15, pedicle, brachial and anterior views of a 

 specimen from bed No. 2, at Burlington, Iowa. 



Issued May 9, 1905. 



