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MISCELLANY. 



CONULARIA Vernn"lm. n. s. Emmons. 



Description. — Quadrangular, tapering, forming a pyramid with 

 an oblique base; sides and angles unequal; the lour angles equal- 

 ly grooved or sulcated; triangular faces or planes undulating and 

 marked in the middle by a faint sulcus; faces ornamented by close 

 papillated ridges, distinct upon the middle and basal extrendty, 

 but obsolete towards the apex; papilla hollow, and slightly elon- 

 gated longitudinally, equal; cuticle formed of two coats; inferior 

 closely grooved, but papillae indistinct or wanting; linear ridges 

 parallel, in two sets upon each, slightly convex; convexity to- 

 wards the base, forming at the middle of each face a single un- 

 dulation, which marks the place of the facial sulcus. 



Observations. — This conularia is nine inches long, and three 

 inches broad at base; the broadest face is two inches, and the 

 narrow, one and a quarter wide at base. The small end is three 

 fourths of an inch wide, and nearly flat. It is in the form of a 

 compressed, oblique angled pyramid, with two obtuse and two 

 acute alternating angles. It appears to be destitute of septse, and 

 the cuticular covering extremely thin, and the papilla indistinct 

 to the unassisted eye; the faces appear finely lined. 



Geological Position and Locality. — 

 ^i§' Carboniferous limestone of the river Des- 



moines, Iowa. 



Fig 1, shows the appearance of the 

 papillated lines towards the basal ex- 

 tremity, and slightly magnified. Fig. 2, 

 the lines as the papillae are becoming 

 obsolete towards the apex. It appears 

 quite probable that fhis change is due 

 to age, or it may arise from accident, 

 as friction, etc. 



Fj 



