1898-1902. No. 32] FOSSIL FAUNAS FROM SERIES B. 21 



specimen comes extraordinarily near to Schuchertella interstriata HAI.L, 

 a very common species in the Manlius of New York. The characters of the 

 surface agree completely with those described and depicted from this 

 species. We find a series of well marked, rounded radiating .strue, with 

 new ones appearing as we pass nearer to the front. The distance be- 

 tween the ribs equals their width. These striae are crossed by very 

 numerous fine concentric lines, visible to the naked eye in a good light. 



The characters by which this form differs from S. interstriata are 

 chiefly the occurrence of a sinus, secondly also by a less elevated beak. 



Occurrence: B, lower part, Reindeer Valley. 



Pentameridae. 



Gypidula HALL. 



Gypidula coeymanensis var. prognostica SCHUCHERT. 



PI. VII, fig. 5. 



1913. Gypidula coeymanensis SCHUCHERT var. prognostica SCHUCHERT 

 Geol. Survey of Maryland, Low. Devonian, p. 344, pi. 62, figs. 911. 



A single and not quite complete ventral valve of a rather small 

 Gypidula agrees with the more slender types of this variety, charac- 

 teristic of the Keyser member of the Maryland Lower Helderbergian. In 

 Professor SCHUCHERT'S collections in New Haven I have been able to 

 examine Maryland-specimens for purposes of comparison. 



The length of the specimen from the beak to the anterior margin 

 is 2 cm.; greatest width, --not quite complete, -- amounts to 1,5cm. On 

 the middle part of the valve run a series of longitudinal plications of 

 different strength. They are most conspicuous in the anterior part, dis- 

 appearing towards the beak. 



Occurrence: B, lower part, Reindeer Valley. 



Telotremata. 



Rhyn ch on el lid a e . 



Stenocliisma CONRAD. 



Stenochisma deckerensis WELLER var. arctica nov. var. 



PI. VII, fig. 7-8. 



This is one of the few forms that are really well represented in the 

 material, occurring as it does in a very great number of fine, free speci- 

 mens. The size varies greatly, the largest specimens having a length of 

 16 mm., a width of 19, and a thickness of 1012 mm., the thickness 

 varying greatly in different specimens. The number of plications in the 



