3 0AiJai307 



SinnCKIi IIMIIEPATOPCKOtt IKIAEMIH HiyKl. 



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



\iir s£Rif:. 



no *n3HK0-MATEMATH4ECK0My OTAtJIEIIIK). 

 ToMi. XIII. A5 S. 



CLA8SE PHY8IC0-MATHEMATIQUE. 

 Volumo XIII. JV» S. 



ON THE 



STRUCTURE AND CLASSIFICATION 



OF THE 



TREMATASPIDAE 



BY 



William I*atteii, Ph. D. 



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



WITH TWO PLATES. 



(Presented to the Academy the 20 Oct. 1901) 



c.-nETEPBypri>. igoH: st.-petersbourg. 



npo^eTca 7 KovticcioHepoB-B HunBPATorcKofl 



AKa^eMiH HayEii: 



H. H. rjiasynoBa, M. drrepea h KoMn. h K. JI. PoKKepa 



BT. C.-neTep6yprfe, 

 H, D. KapfiacilHKOlia m, C.-neTep6., Mockb^, Bapmaet 



li BMJkHfe, 



II. fl. OrjoOJBHft B-B C.-neTep<5yprt h Kiesfe, 

 H. B. KaWRHHA B-b MocKst, 

 E. n, PacoouoBa ni, OAecct, 

 U. KlMMewlfl B-B Part, 



♦oecT, (r. raceeju.) bt. J[efi^^H^fe, 



JIlOSaKl H KOHB. B-b JIOHAOHt. 



Commissionnaires de I'Acad^mie lupiniALE des 



Sciences: 



J. Glasoonof, H. Eggers & Cie. et C. Ricker h St-P6ters- 



bourg, 

 H. Earbasnifcof k St.-P6terflbourg, Moscou, Yaraovie et 



Yilna, 

 ». Oglobline Ji St. Peterabourg et Kief, 

 H. RlDkioe k Moscou, 

 E, Kaspopof k Odeasa, 

 K. Kymmel i. Riga, 



Voss' Sortlmeut (G. Haessel) i. Leipaic, 

 Lnzac & Cie. k Loudres. 



Ilnna: 80 tcon. — Prix: 2 Mrk. 



