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



specimen comes extraordinarily near to Schuchertella interstriata Hall. 

 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 striae, 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 diffei's from S. interstriata are 

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



Occuri-ence: B, lower part, Reindeer \'aliey. 



Pentameridae. 



Gypidula Hall. 



Gypidula coet/manensis 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. 9—11. 



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 JVIaryland Lower Helderbergian. In 

 Professor Schuchert's collections in New Haven 1 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 1,5 cm. On 

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

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

 appearing towards the beak. 



Occurrence: B, lower part, Reindeer Valley. 



Telotremata,. 

 Rhynchonellidae. 

 Stenochisma Conrad. 

 Stenochisma deckerensis Weller var. ardica nov. var. 

 PI. VII, fig. 7-8. 

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

 material, occuriing 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 10-12 mm., the thickness 

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



