\'^ 



The Nautilus. 



Vol. XVI. JUNE, 1902. No. 2. 



A NEW SPECIES OF LAMPSILIS. 



BY L. E. DANIELS. 



Lampsib's blatchleyi n. sp. Plate II. 



Shell long, elliptical or obovate, compressed, thin, inequilateral, 

 slightly gaping behind ; beaks low, but little inflated, pointed, with 

 minute nodulous sculpture ; dorsal and basal outlines lightly curved; 

 anterior end somewliat narrowed, rounded ; posterior end rounded 

 and lightly and obliquely subtruncate above ; surface with singular 

 growth lines ; epidermis somewhat concentrically wrinkled, project- 

 ing beyond the border of the shell, yellow green with faint green 

 rays ; pseudocardinals rudini^^ntary, smooth, subcompressed ; laterals 

 straight, single in the right valve, partly double in the left; nacre 

 brilliant, iridescent, having a somewhat coppery luster in the cavi- 

 ties, becoming very thin and greenish at the edges. 



Length 45, height 21, diameter 10 mm. 



Length 40, height 17, diameter 8^- mm. 



Soft parts : Marsupium very large, occupying the posterior two- 

 thirds of the outer gills, each lobe containing apparently about forty 

 narrow ovisacs, the whole rounded and projecting well below the 

 inner gills; inner gills united to the abdominal sac throughout their 

 length; |.'alpi large, elliptical, projecting backward but little; 

 mantle much tliickened on the border, its edges being decidedly 

 double wavy and dark-colored ; branchial opening rather large, with 

 stout paj)illa3 ; anal opening small, crenulate ; super-anal opening 

 long, closed below ; foot rather large. 



Habitat : Wabash River, Section 32, Linn Township, Posey 



