Stanton.] SERPULID.E. 53 



VERMES. 



SERPULID^. 

 Genus SERPULA Linnaeus. 

 Serpula intrica White. 

 PI. i, Fig. 1. 



Serpula intrica White, 1876, U. S. Geog. and Geol. Sur. West 100th Meridian, vol. iv, 



p. 205, PI. 15, Fig. 5a. 

 Compare Serpula gordialis- (Schloth.) Geinitz, Palaeontographica, vol. xx, pt. 1, p. 



282, PI. 63, Figs. 2, a. 



"Tubes small, slender, cylindrical, smooth, very long and very tor- 

 tuous, not perceptibly increasing in size, so far as our examples show, 

 but neither the distal nor proximal extremity of the tube has been found 

 unbroken. 



" Diameter of the tube, a little more than 1 millimeter. 



"This species is remarkable for the great length and uniform size of 

 the tubes and for the intricacy of their contortions. 



" Position and locality. — Strata of the Cretaceous period; southeast 

 of Paria, Utah." 



Serpula 1 tenuicarinata Meek and Hayden. 

 PI. I, Fig. 2. 



Serpula ? tenuiearinatus Meek and Hayden, 1857, Proc. Acad. Nat. Sci. Phila., p. 134; 

 Meek, 1876, U. S. Geol. Sur. Terr., vol. ix, p. 507. PI. 6, Fig. 1. 



"Tubes growing in groups, or rarely single, nearly cylindrical, increas- 

 ing very gradually in size, irregularly curved, but apparently never 

 spirally coiled, attached by the under side throughout most of the 

 entire length; upper side having a distinct, rather sharply elevated, 

 flexuous, longitudinal carina; surface smooth. 



"Length unknown; average transverse diameter, 0-14 inch. 



"Not having seen entire specimens of this species, it is with some 

 doubt that it has been referred to the genus Serpula. It seems never 

 to have internal septa as in Vermetus. It was originally placed pro- 

 visionally in the genus Serpula and is here, in the same way, retained 

 in that group. 



" Locality and position. — Mouth of Vermilion river, [South] Dakota, 

 on the Missouri, in the Fort Benton group of the upper Missouri Cre- 

 taceous series." 



