50 
PALEONTOLOGY OF NEW YORK. 
the shell than in others, a variation which may be due to the easy destruction 
of the delicate pores which are exceedingly small and much finer than in 
Spiriferina, Cyrtina, and the terebratuloids. 
Attention, however, may be directed to an interesting species from the Cho- 
teau limestone of Cooper county, Missouri, small in size, cyrtiniform in figure, 
with a highly and coarsely punctate shell.* 
While regarding Syringothyris as an outcome from Spirifer along the line of 
the Ostiolati, the genus contains an occasional species which is isomorphic with 
the Aperturati. Such, for example, are the S. Randalli, Simpson, from the 
Waverly faunas of eastern Pennsylvania, and the (S. distans, McCoy, of the Coal 
Measures of Great Britain and Belgium. 
The type species of Syringothyris was named by Professor Winchell, 
Syringothyris typa, and was derived from the Burlington limestone. Drs. King 
and Davidson both regarded this fossil identical with Spirifer cuspidatus, Martin, 
and they have been followed by Meek, Walcott and Herrick, but SchuchertI 
has pointed out difierences which may serve to keep the European and Amer¬ 
ican forms distinct. 
The fact that the species Spirifer Carteri, Hall, from the Waverly sandstones 
of Ohio, is a Syringothyris has been long known. Swallow’s Spirifer {Cyrtia ?) 
Hannihalensis, from the Choteau limestone, is a smaller form of the same specific 
type as S. typa. 
In the Waverly fauna of Pennsylvania occur the species described by Mr. G. 
B. Simpson as S. Randalli and »S. angulata.X In the development of the same 
fauna in Ohio, and in the Keokuk group of Indiana, Illinois and Iowa, S. texta, 
Hall, and its allies are not uncommon species {Spirifer textus, Hall, S. suhcuspi- 
datus, Hall, S. propinquus, Hall). 
=’=Tliis is evidently an nndescribed shell, and as it is an impoi-tant one for our purposes the name 
Syringothyris Missouri is projwsed. Its hig-hly punctate shell, its size and form, all indicate a deviation 
toward Cyrtina, while the canaliform transverse plate is developed as a very delicate structure. For a 
fuller description of the species see the supplement to this volume. 
t On Syringothyris, Winchell, and its American species ; Report of the N. Y. State Geologist for 1889, 
p. 230. 1890. 
I Pi-oc. American Philosophical Society, vol. xvi, 1889, p. 435. These wei-e described as S. Randalli 
and var ang^llata, but as the former possesses a plicate fold and sinus and in the latter the fold and sinus 
are smooth, it will be better to regard them as distinct species. 
