irii INFERIOR OOLITE AMMONITES. 



Remarks. — The above definition and notes are drawn up partly from Waagen's 

 figure, partly from several photographs and a 

 drawing kindly sent me by Dr. Paul Gustaf 

 Krause, to whom I beg to tender my very best 

 thanks for the considerable trouble he took in 

 this matter. 



I cannot identify any English specimens 

 satisfactorily with Am. discites. Those which 

 agree in costation differ in proportions ; those 

 which agree in proportions differ in costation ; 

 and most species seem to be more longilobate. 



As this is an important species, and the type 

 of the genus, a reproduction of one of Dr. 

 Krause's photographs of the type is advisable. 

 It is given in the accompanying fig. 88. The 



Fig. 88. — Hyperlioceras discites (Waagen). . 



From a photograph of the hoiotype in species more or less closely allied to Hiiperhoceras 



the Berlin Museum. 



discites are given in the following pages. 



a. Subtriangularia. 

 1. Hypekliocekas deflextjm, S. Buchman. Plate XIX, figs. 1, 2. 



1889. Hyperlioceras discoideum, {3, This Mouogr., PI. xix, figs. 1, 2 only; 



pp. 98—100 (pars). 



Description. — To 50 mm. diameter costate ; to 70 mm. diameter subcostate ; 

 then smooth ; whorl-section subtriangular, becoming flattened. 



Distinction. — Young like H. discites, but they differ in whorl-section. From 

 A. discoideus, see p. 99. 



Note. — Not Deltoidoceras, nor Deltotoceras, because the suture line is 

 brevilatilobate. 



Date of Existence. — Discitse hemera, presumably. 



2. Hyperlioceras Desoiu (Moesch). Plate XVII, figs. 0, 7; Suppl., Figs. 89, 90, 



p. clxv. 



1889. Hyperlioceras Desori, This Mouogr., PI. xvii, figs. 6, 7 ; p. 97. 

 Remarks. — Moesch gives the dimensions of his specimen as — diameter 124 mm., 



