OLENELLUS AND OTHER GENERA OF MESONACID.gi 387 



Mesonacis torelli (Moberg) (continued) : 



12 and 12a. Thoracic spine, top and side view. X 2. U. S. Na- 



tional Museum, Catalogue No. 56793^. 



13 and 13a. Fragment of the axial lobe of a thoracic segment with 



a short, strong, median spine. X 2. U. S. National Museum, 

 Catalogue No. 56793c. 



14. Fragment of the axial lobe of a thoracic segment viewed in 



the same position as that of fig. i^a. [After Moberg, 1899, 

 pi. 15, fig. 12.] Cast in U. S. National Museum, Catalogue 

 No. 2463 !£■. 



15. A long spine. X i-5- [After Moberg, 1899, pi. 15, fig. 16.] 



Cast in U. S. National Museum, Catalogue No. 24631/. 



16 and 17. Pleurae from the anterior portion of the thorax. X i-5- 

 Figure 16 represents the under side partly concealed by the 

 matrix and fig. 17 the upper or outer side. [After Moberg, 

 1899, pi. 15, figs. 8 and 7, respectively.] 



18. Fragment of a posterior thoracic segment. X i-5- [After Mo- 

 berg, 1899, pi. 15, fig. 10.] 



All of the specimens represented by figs. 5-18 are from 

 locality (3211^), near Bjorkelunda, Sweden. 



The originals from which Moberg's figures were drawn are 

 in the collections of the Geological Institution of the Uni- 

 versity of Lund, Sweden. 



