422 Thirty-fifth Report on" the State Museum. 



This species is easily recognized by the prominent alternating 

 rounded lamellae at the margin, and the oblique smooth space at the 

 bottom of the calix. 



Formation and locality. Schoharie grit, Schoharie, N. Y. 



Streptelasma inflatum, n.&J).?tA*>' ! ''f4>/' 



Corallum simple, turbinate, straight or slightly curved, very attenu- 

 ate below ; exterior with gentle undulations and with strong longi- 

 tudinal striae; height 40 mm.; for about one-half the height gradu- 

 ally, then very abruptly expanding ; diameter of calix 40 mm., 

 depth 25 mm.; fossette deep, commencing at the center, 5 mm. in 

 width, 7 mm. in length, situated on posterior side ; number of lam- 

 ellae 80, alternating in size, rounded at the margin, becoming sharp 

 on the sides. The adjacent principal lamellae of the anterior portion 

 of the calix coalesce as they approach the center, the lamellae thus 

 formed again coalesce, forming fascicles of from 2 to 7 lamellae ; those 

 of the anterior portion are not fasciculated. This species bears some 

 resemblance to the figure of Zaphrentis corticata, but the lamellae are 

 coarser; their arrangement at the center is different, and the exter- 

 nal characters are very different from those of that species. 



Formation and locality. Corniferous limestone, Falls of the Ohio. 



Streptelasma simplex, n. sp. +* J ' ^y fc^f* 

 Corallum simple, turbinate, straight or slightly curved, exterior 

 with concentric wrinkles and striae ; longitudinal striae distinct ; 

 height of corallum 30 mm., depth 20, sides regularly sloping ; fossette 

 situated a little on one side of the center, and consisting of a deep 

 depression not extending on the sides of the calix; number of lamellae 

 60, at the margin broad, rounded, of nearly uniform size, alternating 

 below ; the principal lamellae extending to the center are twisted and 

 elevated, forming a small false columella. In all the individuals ob- 

 served there are no tabulaa. 



One individual having a height of nearly 40 mm., and a diameter 

 at the calix of 35 mm., is essentially the same as this species except t 

 that on one side of the calix is a smooth elevation extending from 

 the center to the margin, being sharp at the center and widening as 

 it recedes, having at the margin a width of 3 mm., but this feature is 

 probably due to accident. 



Formation and locality. Corniferous limestone, near Louisville, Ky. 



Streptelasma laterarium, n. sp. P/jJ. F**/k >y.*/A 



Corallum simple, turbinate, curved ; exterior with prominent 

 rounded annulations ; longitudinal striations fine, but very distinct ; 

 height of corallum 40 mm.; diameter of calix, 20 mm., depth 20 



