216 
PALEONTOLOGY OF NEW YORK. 
Observations. Dr. Waagen has shown the necessity of adopting for these 
shells the early term Enteletes, as Fischer’s figures accompanying his diagno¬ 
sis prove to be of the well-known fossil Spirifer Lamarcki, although his descrip¬ 
tion, sufficient for the purposes of that time, is of little value in establishing 
his genus. The regret expressed by Dr. Waagen at being compelled to super¬ 
cede Meek and Worthen’s term, Syntrielasma, will be generally felt, especially 
as these authors had characterized their genus very accurately and illustrated 
it with care; they also demonstrated its close relationship to Orthis. This 
appears externally in the bi-perforate cardinal areas, uncovered delthyria, and 
tubulo-striate surface. It has already been suggested that these forms are 
linked to the punctate resupinate species of Orthis (Schizophoria) through the 
Orthis? Morganiana of Derby. Though the shells are extremely globose, and 
their sharply plicated surface is not to be found among species of the genus 
Orthis, they are distinctly resupinate ; the interior characterized by the great 
development of the crural plates in the brachial valve, and the three plates in 
the opposite valve, which are orthoid features carried to an extreme develop¬ 
ment. The cardinal process is small, erect and multilobate. The muscular 
markings have not been determined; it is evident from analogy with Schizo¬ 
phoria that in the pedicle-valve the muscular area was limited to the very 
narrow space between the two lateral septa and was divided by the median 
partition; in the brachial valve the wider space between the crural plates is 
also divided by a faint median ridge. 
Before Dr. Waagen’s study of the Salt-Range faunas but two species of this 
genus were well known; one the Enteletes Choristites or Spirifer Lamarcki, of the 
Upper Carboniferous limestone of Mjatschkowa, Russia; the other Syntrielasma 
hemiplicatum, Hall, sp., from a corresponding horizon in America. 
Dr. Waagen has added seven species, and proposed a subdivision of the genus 
as follows: ventrisinuati ; A, group of Enteletes hemiplicatus, Hall (sp.), i. e., 
forms with a ventral sinus: dorsosinuati, forms with a ventral fold; A, group 
of Enteletes ferrugineus, Waagen, subequally convex shells; B, group of Enteletes 
pentameroides, Waagen, extremely gibbous species of pentameroid aspect. To 
