44 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 148 



axial furrow, almost merging with the general convexity of the cepha- 

 lon. Occipital furrow very shallow ; occipital ring extended into a long, 

 slender, almost horizontal spine. Fixed cheeks convex and down- 

 sloping; frontal area short (sag.), not differentiated into preglabellar 

 field and border. Ocular ridges barely indicated ; palpebral lobes almost 

 indistinct, at level of the anterior fourth of glabella. Posterior area 

 broad, strongly downsloping, rounded distally, deeply furrowed in con- 

 trast to the shallowness of all other furrows. Margin of posterior border 

 showing a geniculation close to the axial furrow. Surface of test com- 

 pletely smooth. Length of largest cranidium, exclusive of spine, 2.2 

 mm. 



Discussion. — The species differs from the type, with which it is 

 associated, in the obsolescence of the axial furrow and the proportion- 

 ately larger and unfurrowed glabella. 



Occurrence. — The type locality is cnmV20, Washburn. Also in col- 

 lection cnn/16. Smith Hollow. The stratigraphic position is in the up- 

 per Crepicephalus zone. 



Types.— RoXoty^t: U.S.N.M. 144559. Paratypes: U.S.N.M. 144- 

 560. 



Family CATILLICEPHALIDAE Raymond, 1938 



Genus PEMPfflGASPIS Hall, 1863 



Type species. — Pemphigaspis bullata Hall. 



PEMPHIGASPIS, species undetermined 



Plate 7, figures 23-25 



A few cranidia and pygidia of Pemphigaspis, the latter fragmentary, 

 may be identical with the type species but are not sufficient for a satis- 

 factory identification. 



Occurrence. — Uppermost beds of lower limestone member of the 

 Nolichucky (Crepicephalus zone) at locality cnn/3. 



Disposition of material. — Figured specimens : U.S.N.M. 144562. 



Genus MADAROCEPHALUS Resser, 1938 



Type species. — Madaroccphalus laetus Resser. 



MADAROCEPHALUS LAETUS Resser 



Plate 8, figure 20 



Madaroccphalus laetus Resser, 1938a, p. 87, pi. 10, figs. 51-53. 



A single cranidium agrees with the types, and proves that the species 

 belongs to the Crepicephalus zone. 



Occurrence. — Type locality is U.S.N.M. 56v, near McCalla, Ala. 

 The author collected the specimen in the upper part of the lower lime- 



