AUT. 9 NEW CAMBKIAlSr CRUSTACEA — RESSER 9 



TUZOIA MANCHURIENSIS Eesser and Endo « 



Plate 3, figures 2, 3 



Several rare, fragmentary valves collected at two localities in cen- 

 tral Manchuria, constitute the material on which this species is 

 founded. It is quite possible that they represent more than one 

 species. Comparing the Manchurian species with those from the 

 Burgess shale we note that in general shape it differs little from the 

 genotype, but due to the fact that all the specimens preserve only the 

 anterior portions of the valves nothing can be determined regarding 

 the number and characters of the marginal spines. The reticulations 

 are quite similar also, the smaller ones on the keel perhaps being more 

 suddenly differentiated from those on the remainder of the test than 

 usually occurs in the American species. It is the appearance of the 

 keel in the two specimens illustrated that injects some uncertainty as 

 to their specific identity, and this can only be cleared up by securing 

 more material. 



Horizon and locality. — Middle Cambrian; Huo-lien-chai and Mt. 

 Tang-shih-ling, near Yen-tai, Manchuria. 



Holotype and faratype.—Q^i. Nos. 80481, 80482, U.S.N.M. 



TUZOIA POLLENI, new species 



Plate 5, figures 1-3 



This fine Lower Cambrian species is represented in the collections 

 by four practically complete specimens besides a few instructive 

 fragments. 



In shape and general appearance it is most like the Middle Cam- 

 brian genotype. It differs in its stronger reticulations, more particu- 

 larly in its four instead of three large posterior spines — in which re- 

 spect it is like T. canadensis — and most of all in the size and abun- 

 dance of the spines along the dorsal line where five or more may be 

 counted in the anterior half of the line. These spines were consid- 

 erably longer than indicated in the illustrations, if the small frag- 

 ment in the collections is properly interpreted as to species and posi- 

 tion in the test. None of the specimens clearly preserve dorsal spines 

 in the posterior third or more of the line, and since other species also 

 lack spines in that place it may be assumed that if any were present 

 in this species they were smaller than the anterior ones. 



The specific name is given in honor of the discoverer of these in- 

 teresting fossils in the Lower Cambrian of British Columbia. 



Horizon and locality. — Lower Cambrian, Eager formation ; (loc. 

 ^^1^)^ near Cranbrook, British Columbia. 



Holotyfe and lyaratypes.—Q^t. No. 80485, U.S.N.M. 



^This species is here described in collaboration with Dr. R. Endo, and will be cited as 

 Tusoia manchurtensis Resser and Endo. 



62996—29 2 



