NATURAL SCIENCES OF PHILADELPHIA. 



185 



NOTICE OF A NEW BEACHIOPOD FEOM THE LEAD BEAEING ROCKS 

 AT MINE LA MOTTE, MISSOURI. 



BY F. B. MEEK. 

 LINGULELLA LAMBORNI, Meek. 



Fis:. 4. 



Fiir. 1. 



Fi2;. 3 



1. Lingulella? Lamhorni; being a view of the area and interior of a ventral valve, en- 

 larged to 2)^ diameters: s, s, are lateral internal scars, and (a) the area with its mesial 

 furrow for the peduncle. 



2. Lingulella Davisii; being an internal cast of the dor.'ial valve, with a view of area of 

 the ventral valve and its mesial furrow. Nat. size, after Mr. Davidson. 



3. An outline internal view of another specimen of same species, showing internal scars as 

 understood by Mr. Salter; C, being supposed to represent the anterior retractors ; and B, on 

 each side, the sliding muscles. Nat. size, after Mr. Salter. 



4. Lingulepis pinniformis; being a view of internal cast of a ventral valve, showing the 

 trilobate scar within. Enlarged about 2 diam. From N. Y. Kegeuts's 16th State Cab., Nat. 

 Hist. Report, pi. 6, tig. 16, for comparison with fig. 1. 



Shell small, compressed, broad-subovate, being about one-fifth 

 longer than wide. Ventral valve pointed at the beak, from which 

 the nearly straight lateral slopes diverge at an angle of about 

 35°, to near the middle of each lateral margin, from near which 

 these margins round forward into the regularly rounded front ; 

 false cardinal area well developed, and extending back with the 

 beak nearly one-fourth the length of the valve behind that of the 

 other valve, and having its mesial furrow for the peduncle well 

 defined, witli on each side of it a diverging longitudinal line ex- 

 tending from the apex of the beak, so as to form the margins of 

 the false area, which is transversely striated ; interior marked by 

 numerous little irregularlj' scattered pits, which are largest pos- 

 teriorly and diminish in size forward ; Avhile near the anterior 

 margin very obscure traces of minute radiating strire are some- 

 times seen ; internal scars presenting a trilobate appearance, 



1871.] PART XL— 13 



