238 FoRTt-THiRD Report on the State Museum. 



Artificial casts, made fx'om natural molds of the transverse plate, 

 show it to have upon its lower side a rounded ridge which has no 

 furrow or channel in it, as is the case in S. carteri. This ridge is well 

 developed in the umbonal region, in some specimens gradually disap- 

 pearing towards the inner end of the plate. There is no prolongation 

 into a tube or blunt point. 



None of the specimens examined show more than the ventral 

 area, which has the same dimensions as in Syringothyris carteri, from 

 Burlington, Iowa. 



Prof. Hall illustrates and describes this species as having faint 

 plications upon the fold and sinus which character will separate it at 

 once from all species of this genus except Syringothyris randalli, Simp- 

 son. That species, however, has a much lower ventral area. 



Distribution. — Chemung of Meadville and Union City, etc., Pa. Top 

 of Erie s'jale at Bedford, Ohio, associated with Spirifer disjunctus. 



• Sykingothyris randalli. Simpson. 



Syringothyris randalli, Simpson, 1889. American Philosophical Society, 

 p. 441, figs. 1, 2. 



This species is closely related to S. alta. Hall, in having plications 

 upon the fold and sinus, and these two species are the only ones known 

 to possess this character. They di£Per, however, by S. randalli having 

 a much shorter area and in having the canaliferous plate and prolong- 

 ation fully developed. 



Distribution. — Waverly group (Chemung group on the authority of 

 Mr. F. A. Randall) of Warren and Erie counties, Pennsylvania. 



Syringothyris herricki. n. sp. 



Syringothyris cuspidatus, Herrick, 1888 (partim). Bulletin Denison 

 University, vol. 3, pi. 5, figs. 4-7 (non pi. 1, fig. 7, and pi. 2, fig. 17), 



In a very soft yellow sandstone, occurring in the "Waverly group of 

 Ohio, a species of Syringothyris has been found and figured by Prof. 

 Herrick as S. cuspidatus. The specimens I have seen are ventral 

 valves and show no compression. Externally they differ from S. cus- 

 pidata or S. carteri, in having the ventral area strongly arched and 

 short, with the beak strongly incurved. The ventral valve is also 

 more gibbous. The peculiarity of these specimens, in which they 

 differ from all other species of this genus known to me, lies in the 

 transverse plate between the dental plate of the ventral valve. This 

 plate, in typical species of this genus, is prolonged into a split tube. 

 In this species there is attached to and beneath this plate a large, 

 solid process, directed inward and downward, broadly rounded on the 



