﻿AMERICAN TERTIARY AND CRETACEOUS FOSSILS. 399 



Elongated, curved at the narrow end into a hook sometimes with as much as three 

 fourths of a whorl, all in the same plane ; mouth .slightly constricted, nearly circular, 

 edge thin ; surface marked by two or three wrinkled longitudinal folds on each side 

 and a heavy squamose plate, very irregular in the plane of the curve on each side. 



Dimensions. — Length about 1 in., exclusive of the curve, greatest width of the 

 plates - 4 in., diameter of mouth '12 in. 



H. major, n. s. PI. 68, fig. 46. Large, regularly curved, tapering, marked by three 

 or four large longitudinal corrugations; mouth contracted?; no lateral expansion. 



Dimensions. — Length exclusive of whorl 1/8 in., diameter of whorl 1-3 in., greatest 

 width of tube '6 in., (slightly compressed.) 



Locality. — Ripley Group, Eufala, Alabama. Prof. Holmes. 



From a careful study of the species of this genus I am satisfied that it is distinct from 

 Serpula, although Bronn in his " Index Palseontologicus " so refers it. 



I have seen a large number of specimens of H. onyx and H. squamosus, and have 

 never been able to detect any sign of attachment to another substance. They appear 

 to have constituted a distinct genus of serpuloid animals, always free, with a hook- 

 like shell irregularly angular externally and round internally. The present species 

 tends to confirm this opinion. I have seen several specimens and they all agree with 

 the above statements. 



FLABELLUM. 



F. striatum, G. and H. PI. 69, fig. 10, 11. Thick, wedge shaped; angles of case 

 acute ; laminae thin, edge finely crenate, slightly undulate ; sides coarsely granulous, 

 granules regularly arranged in striae, towards the edge of the laminae fine. 



Locality — Rotten limestone of Prairie Bluff, Alabama. 



TROCHOSMILIA, M. Echo. 



T. conoides, G. and H. PI. 69, fig. 12, 14. Resembles closely T. Mortoni, above 

 described, differing in its much more robust form and the finer striae exteriorly which 

 are granulous. 



Locality. — Cretaceous, N. J. 



PLATYTROCHUS. 



P. SPECiosus, G. and II. PI. 69, fig. 15,17. Conical, laminae exsert, denticulate and 

 granulous; exterior coarsely striate from the continuations of the exsert lamellae, 

 striae alternating in size, coarsely granulous, often denticulate on the edge ; depth of 

 cup exceeding half the length of the mass. 



Dimensions. — Length '5 in., breadth of top *57 in. 



Locality. — Hardeman Co., Tenn. Prof. Safford. 



