NO. 13 DIKELOCEPHALUS AND OTHER GENERA 347 



references of species by authors. Fortunately Dr. W. C. Brogger 

 studied the genus and in 1886 proposed three new genera that served 

 in a measure to bring order out of the confusion before existing. 



1 have not been able to secure entire specimens of any species of 

 Dikclocephalus (as restricted), but entire dorsal shields of the closely 

 related Saukia lodensis (pi. 65) and Satikia crassiniarginata (pi. 66) 

 give some conception of the probable form of the dorsal shield of the 

 genotype, D. minnesotcnsis. 



I am indebted to Mr. Edgar E. Teller, of the Milwaukee IMuseum, 

 for his permission to illustrate specimens of Satikia lodensis and to 

 examine other material in his collection. 



]\Ir. W. A. Finkelburg, of Winona, ]\Iinnesota, sent me numerous 

 specimens from the St. Lawrence and Franconia formations about 

 Winona and on the Wisconsin side of the Mississippi River. 



CLASSIFICATION 



The subfamily Dikelocephalinas Beecher ' was proposed by its 

 author in 1897 to include the genera Dikelocephalus, Asaphelina and 

 Crepicephalus. Just before Dr. Beecher's paper appeared, Dr. Brog- 

 ger called attention to the resemblance between Asaplieliim miqiicH 

 Bergeron and the Asaphidae,' and I agree with him that Asaphelina 

 should be grouped under the Asaphidse and not the Dikelocephalinse. 



The third genus mentioned by Beecher, Crepicephalus Owen, as 

 shown by entire specimens of C. texanus Shumard,^ appears to be 

 more nearly related to the Oleninre. 



W^ith the elimination of Asaphelina and Crepicephalus from the 

 Dikelocephalinae there remains of the genera referred to it by Beecher, 

 only Dikclocephalus ; with this there is now included in this paper the 

 genus Conokephalina (Brogger)^ with Conocephalites ornatits as the 

 genotype. Brogger also included under Conokephalina, Dikclo- 

 cephalus Osceola Hall, D. viisa Hall and D. spiniger Hall on account 

 of their having narrow free cheeks, elongate palpebral lobes and an 

 elongate, slightly narrowing glabella. Of these species D. niisa is 

 retained under Conokephalina and D. osccola and D. spiniger are 

 referred in this paper to other genera. Conokephalina is represented 

 by several species in the Cambrian fauna of China." It is provisionally 



^ Natural Classification of the Trilobites, American Journ. Sci., 4th ser., Vol. 

 3, 1897, P- 192. 



^ Nyt Mag. for Naturvid., Vol. 36, 1897, p. 185. 



'U. S. Geol. Survey. Monogr. z^, 1899, part i, pi. 65, fig. 5. 



* Geol. Foren. i Stockholm Forhandl., No. loi, Vol. 8, 1886, pt. 3, p. 206. 



° Research in China, Vol. 3, Carnegie Institution of Washington, Pub. No. 

 54, 1913, Paleontology, The Cambrian Faunas of China, p. 138. 



