204 CRETACEOUS PERLOD. 



simple, never coalescing, and never failing to completely encircle the volu- 

 tion. The nodes are moderately prominent ujDon exfoliated specimens, and 

 where the test is presei-ved they are seen to be subspinous or shai-ply 

 nodose. 



Septa moderately distant, sometimes embracing two annulations, but 

 toward the apertm'e only one. Lobes all smaller than the saddles, the size 

 in each transverse series gradually diminishing from the dorsal to the ven- 

 tral one; the smallest saddle, the ventral, not being larger than the largest 

 lobe, the dorsal; lobes all bifurcate, except the ventral, the inferior lateral 

 lobe being but slightly so; the anterior portion of the space between the 

 branches of the dorsal lobe occupied by two backward-projecting points; 

 the ventral lobe is simple, small, naiTOw, and serrate upon both sides. The 

 saddles of the different longitudinal series all similar in shape, diminishing 

 gradually in size from the dorsal to the ventral series; all broader than long, 

 except the ventral one, the length and breadth of which are about equal; 

 each partially parted at the middle; edges of all the lobes and saddles ser- 

 rated or toothed. 



The longest fragment in the collection measures about seven centi- 

 meters. At the larger end of this the long diameter is fifteen millimeters 

 and the short diameter fourteen millimeters ; at the smaller end the long 

 diameter is eight and a half millimeters. 



This species is similar in aspect to H. Mortoni Hall and Meek, but dif- 

 fers from it in diminishing in caliber much more rapidly toward the apex, 

 in the presence of a double series of nodes along the dorsum of the volu- 

 tions, and in the proportions and details of its lobes and saddles. 



Position and locality. — Oi-etaceous strata; southeast of Paria, Utah. 



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