42 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 148 



Occipital furrow well impressed; occipital ring expanded medially, 

 rounded. Fixed cheeks convex, rising somewhat above axial furrow, 

 then downsloping. Frontal area short, about one-fiifth the glabellar 

 length ; border narrow and poorly defined by a shallow border furrow. 

 Ocular ridges faint, transverse in direction ; palpebral lobes narrow and 

 short, in advance of glabellar midpoint. Posterior area as in type 

 species, steeply downsloping, well furrowed. Free check with border 

 well defined anteriorly, poorly marked posteriorly; genal angle 

 rounded. 



Pygidium with long axis, showing about 4 distinct rings, reaching 

 the posterior margin. Pleural platforms flat; border downsloping. 

 Pleural and interpleural furrows both well marked. Each segment has 

 the characteristic distal ridge as in other species. 



Surface of cranidium in most of the specimens from the type locality 

 with scattered tubercles only in certain areas, more apparent on the 

 posterior portion of the fixed cheeks, almost lacking on the glabella. 

 Some of the cranidia appear entirely smooth, particularly among those 

 from collection cnq/20, and especially from the higher collection 

 cnrV20. However, smooth and granulated cranidia occur on the same 

 piece of rock, and there are all intermediate forms. 



Length of largest cranidium 3.0 mm. ; length of largest pygidium 1.8 

 mm. 



Discussion. — This species resembles both G. parva, from which it 

 differs in the somewhat wider and shorter glabella, and G. ornata, from 

 which it can be separated by the much weaker ornamentation. 



Occurrence. — The types are from Oder's collection No. 2 at Hurri- 

 cane Hollow, in beds immediately overlying those with G. ornata. Also 

 present in collections cnr/15, cnpV20, cnq/20, and cnrV20. The spe- 

 cies ranges through an appreciable thickness of beds, appearing in the 

 Aphelaspis minor, A. walcotti, and the A. camiro, A. laxa, and A. 

 quadrata assemblages. 



Ty/)^^.— Holotype : U.S.N.M. 144553. Paratypes: U.S.N.M. 

 144554. 



GLAPHYRASPIS DECLIVIS Rasetti, new species 



Plate 14, figures 20-24 



Available material. — Numerous cranidia and free cheeks well pre- 

 served in limestone. 



Description. — Glabella subovate, slightly tapered, rounded in front, 

 rising well above the cheeks. Posterior glabellar furrows of same shape 

 as in G. ornata, very shallow ; other pairs indistinct. Occipital furrow 

 moderately impressed ; occipital ring widely subtriangular, bearing an 

 indistinct node. Cheeks sloping down steeply from axial furrow ; frontal 



