62 Cincinnati Society of Xatural History. 



Mr. Ulrich's definition of Lepidolites is, in substance, as fol- 

 lows: Much flattened, calcareous bodies, sub-spherical, or 

 sub-cylindrical in form. Hollow, with a thin envelope of 

 imbricated plates or scales. The lower (?) end has an inden- 

 tation, while the corresponding portion of the interior is 

 raised into a small cone. The interior of the sack appears to 

 be lined with a very thin and delicate integument, to the outer 

 surface of which the scales are attached. (Jour. Cin. .Soc. Nat. 

 Hist., vol. 2, 1879, pp. 20, 21.) 



The writer in the Geologist already quoted admits that Lepid- 

 olites belongs to the Receptaculitidcs, but denies it is congen- 

 eric with Receptaculites. We are inclined to regard it as be- 

 longing to the genus as above, considering it likely to be the 

 outer integument, named by Mr. Billings the " ectorhin." In 

 his general remarks upon Receptaculites Mr. Billings refers to 

 the form as being discoid, cylindrical, ovate or globular and 

 hollow. "In or near the center of the lower side there is 

 generally to be seen a small rounded protuberance" (p. 379), 

 and from this the plates radiate in curved lines. The " ector- 

 hin " is described as " usually composed of numerous small 

 rhomboidal plates closely fitting together, and arranged in 

 curved rows, which radiate in all directions from the nucleus 

 outwards. =•' '=■ * It seems probable that, in .some of the 

 species, this integument was of a flexible, coriaceous con- 

 sistence." This description coincides with the features of 

 Lepidolites, Ulrich, and we should consider that genus as 

 founded upon an example of the coriaceous membrane re- 

 ferred to by Mr. Billings. 



I. R. RETicuL.\Tus, Ulrich, 1878. 



Hollow; composed of an aggregation of sul)c.\iindrical or 

 club-shaped stems, parallel to each other, and perpendicu- 

 lar to the surface ; inner ends acutely pointed ; outer ones 

 rounded, and with a minute pit ; arranged in cur\L'd or flexu- 

 ous transverse and diagonally intersecting lines. {Atwma- 

 hides reticiilatiis, Ul., Jour. Cin. Soc. Nat. Hist., vol. i. 1878, 

 p. 92.) 



Locality. — Covington, Kentucky. 



Remarks. — For remarks upon this, see after de.scri[)ti()n of 

 the genus above. 



