I92 NEW YORK STATE MUSEUM 



lower side to the stoma. It bears a peripheral elevated or convex 

 band which is bounded above by a sulcus, though not so well de- 

 fined below. The upper shoulder of the whorl is subcarinate while 

 the lower surface is broadly rounded and bears an oblique sulcus 

 on the final third of the volution. Aperture sinuous, projecting 

 above and reentrant in a broad curve below the position of the 

 peripheral band. Surface crossed by fine concentric lines which 

 curve forward on the upper surface of the whorl and make a 

 retral turn on the periphery whence they again curve forward in 

 a broad sweep, on the lower surface being interrupted by the 

 interior sulcus. 



Lower Devonic. Grande Greve, P. Q. 



Trochonema lescarboti nov. 



Shell moderately large, trochiform. Whorls broadly sulcate 

 above, gently convex peripherally and regularly convex below ; 

 three to four in number. Sutures impressed and bounded by an 

 elevated ridge or carina within which the surface is depressed in 

 a broad and shallow sulcus bounded outwardly by a sharp keel 



Trochonema lescarboti 



which lies at the shoulder of the whorl and from which the whorl 

 surface is abruptly depressed. No peripheral band is known 

 though the internal cast bears a peripheral depression. Lower sur- 

 face not known except from the cast, apparently regularly con- 

 vex. Surface marked by regular concentric lines without revolv- 

 ing striae. 



Lozver Devonic. Perce rock, P. O. 



Phragmostoma diopetes nov. 



A small bellerophontid with well developed slit band and ap- 

 parently smooth surface save for regular concentric growth lines. 

 The shell expands rapidly to an explanate mouth which involves 



