ART. 32 A XEV/ PENTAMEROID BRACHIOPOD — KIRK 5 



The apical portion of the pedicle valve is incurved but not 

 strongly so. The valve is moderately arched, and there is a sugges- 

 tion of a median longitudinal flattening. The pedicle valve widens 

 very rapidly, and the cardinal slopes are sharply defined. This 

 gives a structure which so closely simulates the hinge and area of the 

 simpler smooth spiriferoids that as a matter of fact it is often diffi- 

 €ult to distinguish between a young Harindium latux and an associ- 

 ated spiriferoid. The apical portion of the brachial valve is sharply 

 incurved. The remainder of the valve is moderately arched. The 

 pedicle valve exceeds the brachial valve in size but not to the extent 

 found in either of the other species. The anterior margin of the 

 shell is gently sinuate. The exterior of the shell is smooth or 

 marked by fine concentric growth lines. 



H. latus is readily distinguished from younger specimens of the 

 other species described by its greater proportionate breadth, the 

 nearly straight hinge-like union of the valves, the area-like cardinal 

 slopes, and the less preponderance of the pedicle over the brachial 

 valve. 



Horizon and locality. — This species has only been found associated 

 with Brooksina alaskensis in the south-central part of Kosciusko 

 Island, Southeastern Alaska. 



Cotypes.— Cut No. 702,31, U.S.N.M. 



All the type specimens are in the collections of the United States 

 National Museum and were collected by the writer. 



