﻿Remarks on the Genera Lepidolites, Me. 



165 



The points of resemblance between Mr. Ulrich's genus Lepidolites 

 and Ischadites, are numerous enough to place the former in the latter, yet 

 earlier characterized genus. The sub-pyriform or sub-conical shape, the 

 overlapping plates, and their concentric "engine-turning" arrangement 

 are features common to both. Considering, therefore, that Lepidolites was 

 described forty years after Ischadites, it seems best to call the two species 

 credited to the former genus 



Ischadites dickhauti, Ulrich. 



Ischadites elongatus, Ulrich. 



Another genus, the position of which in classification has been a 

 matter of conjecture, was described in the Jour. Cin. Soc. Nat. Hist, Vol. 

 I, p. 92, as 



Anomaloides, Ulrich. 1878. 



The fossils for which this name was proposed are described as " hol- 

 low, compressed, conic al bodies." They were found " to have no surface 

 which can be called ventral or dorsal, since they are composed uniformly 

 of elongated, cylindrical, spine-like bodies, which are placed parallel with 

 each other and perpendicular to the surface." These bodies are further 

 described as "club-shaped stems," with their inner ends acutely pointed, 

 while the end showing on the exterior is rounded, and has a minute pit. 

 "The distribution of these club-shaped plates is very regular, being 

 arranged in curved or flexuous transverse and diagonally intersecting 

 lines." In other words the engine-turned arrangement of Ischadites. 



Now the genus Receptaculites was defined by Defrance as long 

 ago as 1827. Species have been described from the Silurian of 

 America and Australia, and from the Devonian of Belgium. In R. occi- 

 dentalism Salter (Can. Org. Remains Decade I, p. 43), the arrangement 

 of the plates on the outside of the fossil is described as radiating "in 

 curved lines, crossing like the engine-turned ornaments of a watch." 

 Further, it appears that these lines are caused by the peculiar arrangement of 

 a great number of spine-like bodies, arranged perpendicularly to the surface. 

 That the inside is hollow, and that it is often pressed out of shape from a 

 sphere to a cylindrical body. Fig. 2 (PI. 10) given by Salter (Ibid), 

 shows the outside of a weathered specimen and it is very similar in 

 appearance to Mr. Ulrich's figure. (PI. 4, figs. 6, 6 a b, J. C. Soc. Nat. 

 Hist., Vol. I). 



As there is, then, in Anomaloides more resemblance to Receptaculites 

 than difference from it; as both possess the spine-like bodies, 'both are 



