348 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 5/ 



placed in the subfamily DikelocephalinEe as it appears to be an inter- 

 mediate form between Dikelocephahis and Ptychoparia as is sug- 

 gested by Brogger. With the discovery of entire specimens of the 

 genotype, C. ornatiis, it is possible that it may be placed under some 

 other family or subfamily. There is evidently a group of forms that 

 like Conocephalites (= Conokeplialina) emmrichi Barrande (Wal- 

 cott)^ will need careful consideration when a review is made of the 

 Olenidse. 



Three new genera, Saiikia, Osceolia and CalvincUa, are proposed 

 in this paper and are referred to the Dikelocephalinge. 



With our present information, the following genera are included in 

 the subfamily Dikelocephalinse : 



Dikelocephahis Owen, 1852 

 Conokephalina Brogger, 1886 

 ^aM^m Walcott, 1914 

 Osceolia Walcott, 19 14 

 Calvinella Walcott, 19 14 



Observations on the genera. — Dikelocephahis (restricted) appears 

 to be distinct from all other genera by the broad, flattened border of 

 its cephalon, large eyes placed well back, large, broad subquadrangu- 

 lar glabella with strong posterior furrow, and large, wide pygidum 

 with broad, flattened border. 



Saukia has a narrow frontal border about the cephalon and a gla- 

 bella proportionally more elongate than in Dikelocephahis. The pygid- 

 ium of Saukia is less expanded and proportionally more elongate 

 than that of Dikelocephalus. 



The cranidium of Brogger's genus Conokephalina (1886) has a 

 somewhat similar form to that of Saukia, but the strong transverse 

 posterior glabellar furrow of Saukia. and the absence of a clearly 

 marked frontal limb in advance of the glabella serve to distinguish 

 the cranidium of Saukia. The pygidium associated with Conokeph- 

 alina ornata is transverse with a spinose margin, while that of 

 Saukia is nearly as long as broad and the margin is unbroken by 

 spines. 



Osceolia is characterized by its concave frontal limb, elongate pal- 

 pebral lobes ; narrow fixed cheeks and transverse pygidium with its 

 anterior segment extended beyond the margin as a long, strong spine. 



Calvinella is most like Saukia, from which it differs in form of 

 glabella, presence of a strong occipital spine and proportionally more 



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

 SA, 1913, Paleontology, The Cambrian Faunas of China, pi. 13, fig. 7. 



