390 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 53 



DESCRIPTION OF PLATE 28 



PAGE 



Callavia crosbyi, new species 284 



Fig. I. Portion of a large cephalon showing some of the characteristic 

 features of the species. Natural size. U. S. National 

 Museum, Catalogue No. 56798a. 



2. Fragments of a cephalon showing an accidental contraction of 



the posterior portion of the glabella. Natural size. U. S. 

 National Museum, Catalogue No. 56798^. 



3. A cephalon preserving the convexity, entire eye lobes and gen- 



eral characters more perfectly than usual, owing to the com- 

 pression in the matrix of nearly all other specimens. Natural 

 size. U. S. National Museum, Catalogue No. 56798c. 



4. A specimen preserving the cephalon and a number of the tho- 



racic segments. Natural size. U. S. National Museum, Cata- 

 logue No. 56798^. 



5. Portion of a large thoracic segment. Natural size. U. S. Na- 



tional Museum, Catalogue No. 56798^. 



6. A partially restored hypostoma. Natural size. U. S. National 



Museum, Catalogue No. 56798/. 



7. Enlargement of highly ornamented surface of the outer border 



and portion of the side of the cephalon. Natural size. U. S. 

 National Museum, Catalogue No. 56798a. 



8. A specimen preserving the cephalon, sixteen segments of the 



thoracic axis, and a distorted pygidium. X 2. The thoracic 

 axis and pygidium have been compressed from the sides and 

 thus narrowed nearly one-third. U. S. National Museum, Cata- 

 logue No. 56798,5. 



The specimens represented by figs. 1-8 are all from locality 

 (9;;), near North Weymouth, Massachusetts. 



Callavia burri, new species 280 



Fig. 9. A very well preserved cephalon in the collection of the Museum 

 of Comparative Zoology, Cambridge, Massachusetts. Natural 

 size. Cast in U. S. National Museum, Catalogue No. 56795a. 

 10. A portion of a cephalon showing the palpebral lobe, tubercle be- 

 tween the palpebral lobe and glabella and the marginal rim. 

 Natural size. U. S. National Museum, Catalogue No. 567956. 



The specimens represented by figs. 9-10 are from locality 

 (gn), near North Weymouth. Massachusetts. 



