DE L'ACADEMIE IMPERIALE DES SCIENCES DE ST.-PETERSBOURG. 



VIII" SERIE. 



no *H3HK0-MATEMATH^lECK0My 0TA4JIEHIK). 

 IToiirb XIII. 3VS S. 



CLAS8E PHYSICO-MATHEMATIQUE. 

 Volume Xm. JV» S. 



ON THE 



STRUCTURE AND CLASSIFICATIOiN 



OF THE 



TREMATASPIDAE 



BY 



W^illiam Fatten, Ph. D. 



^ ay 



Professor of Zoology in Dartmouth College, Hanover, N. H., U. S. A. 



WITH TWO PLATES. 



(Presented to the Academy the 20 Oct. 1901) 



G.-nETEPBypnb. vmr: st.-petersbourg. 



ripoAaexcH y KOUHCcioBepoBi> HjinEPATOPCKoft 

 AKa^eMiu HayKi>: 



H. H. r^aaynoBft, M. 3rrepca h Kond. u K. JI. PoKKepa 



BT> C.-neTep6ypr-fe, 

 H. D. KapOacHHKOBa bi> C.-neTep6., MocKst, BapniaBib 



li BajibH'ib, 

 H. fl. OrjioOjinna bt. C.-neTep6yprf> n KicBi, 

 M. B. K;iH)KnHa bi> MockbI, 

 E. n, Pacnoiioea bi, OAecc-fe, 

 U. KHMMe.ia B-b Purt, 

 ♦oee-b (r. r3cce.ib) bt. Jlefinnurfe, 

 JIiosaKii n KoMn, bi> JIoHAont. 



Unua: 80 Kon, 



Commissionnaires de PAcademie iHpiRiALE des 



Sciences: 



J. GlasoBDof, M. Eggers & Cie. et G. Rieker k St.-P6ters- 



bourg, 

 N. KarbasniKof h St.-Petersbourg, Moscou, Varsovie et 



Vilna, 

 lY. Oglobline 5. St. Petersbourg et liief, 

 M. Klukiue 5, Moscou, 

 E. Raspopof h Odessa, 

 .\. Kymmei k Riga, 



Voss' Sortiment (6. Haessel) k Leipsic, 

 Lnzac & Cie. ii Londres. 



— Prix: 2 Mrk. 



