396 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 53 



DESCRIPTION OF PLATE 31 



PAGE 



Wanneria halli, new species 301 



Figs, i, 2, and 3. Cephalons with genal angles and spines in advance of 

 the posterior margin of the head and with intergenal angles 

 almost right angles. No. i, X 1-25; No. 2, X 3; No. 3, natural 

 size. U. S. National Museum, Catalogue Nos. 56806a, 56806b, 

 and 56806c, respectively. 



4. A small cephalon with short, minute intergenal spine at the in- 



tergenal angle. Glabella cylindrical, eye lobe large. X 8. U. 

 S. National Museum, Catalogue No. 56806^. 



5. 7, and 8. Minute cephalons showing rounded-in genal angles, 



large eye lobes, and contraction of the glabella at the eye 

 lobes. No. 5, X 24 ; No. 6, X 6 ; No. 5, X 16. Compare with 

 the younger stages of growth of Elliptocephala asaphoides 

 (pi. 25) and Pccdeumias transitans (pis. 25 and 32). U. S. 

 National Museum, Catalogue Nos. 56806c, 56806^, and 56806/1, 

 respectively. 



6. Fragment of a minute cephalon with strong eye lobe, minute 



genal and intergenal spines. X 16. U. S. National Museum, 



Catalogue No. 56806/. 

 9. Hypostoma associated with this species in Alabama. X 12. 



U. S. National Museum, Catalogue No. 568061. 

 ID. Under side or doublure of the extension of the pleurae beyond 



the body line of a thoracic segment. X 2. U. S. National 



Museum, Catalogue No. 56806/. 

 II. Upper side of the pleural lobe of a thoracic segment. X 3- 



U. S. National Museum, Catalogue No. 56806/;. 



All the specimens represented by figs, i-il are from locality 



(56c) north of Helena, Shelby County, Alabama. 



IVaniicna zvalcottanus (Wanner) (See pis. 30 and 44) 302 



Fig. 12. Enlargement of the pleural lobe of a thoracic segment. X 2. 

 This specimen was illustrated by Wanner [1901, pi. 31, fig. 2]. 

 U. S. National Museum, Catalogue No. 56807W. 

 13. A portion of the postero-lateral part of an hypostoma (X 6), 

 showing 'surface markings and five of the short obtuse mar- 

 ginal spines. U. S. National Museum, Catalogue No. 56807H. 

 The specimens represented by figs. 12 and 13 are from 

 locality (817), 2 miles northwest of York, Pennsylvania. 



