NO. 5 CAMBRIAN TRILOBITES RESSER 39 



wide rim bent back toward the glabella at the middle. Fixed cheeks 

 wide, eye lines heavy ; eyes moderate in size and situated rather far 

 back. Free cheeks greatly expanded at genal angles, flat or concave 

 in the outer portion and with long, wide genal spines. 



Pygidium with wide axis. Pleural furrows well defined and pleural 

 lobes extended into spines. 



Surface usually with scattered granules often of more than one 

 size. 



Owing to the width of the fixed cheeks, some species were referred 

 to Olenopsis, while those for which the pygidium was known were 

 placed in Crepicephahis. 



Genotype. — K. tnherculata Poulsen. 



Range. — Later Lower Cambrian, extending into Middle Cambrian. 



DESCRIBED SPECIES REFERRED TO KOCHIELLA 



Besides the species discussed below, there are K. propinqua Poulsen, 

 K. arcana Poulsen, and K. gracilis Poulsen. 



Kochiella tuberculata Poulsen 

 Kochiclla tuberculata Poulsen, Meddels. Grjzinland, vol. 70, p. 259, pi. 15, 



figs. 7-13, 16, 1927. 

 Crepicephahis cf. cecinna Poulsen, Meddels. Grj^nland, vol. 70, p. 267, pi. 16, 

 figs. 17, 18, 1927. 



There can be but little doubt that this pygidium represents a species 

 of Kochiella. 



Lower Cambrian, Cape Kent ; Cape Kent, North Greenland. 

 Cotypes. — Min. Mus. Copenhagen. 



Kochiella crito (Walcott) 

 Olenopsis crito Walcott, Smithsonian Misc. Coll., vol. 67, no. 3, p. 75, pi. 11, 

 fig. 6-6b, 1917. 



Lower Cambrian, Mount Whyte ; (loc. 6oe) Ptarmigan Lake Pass, 

 Alberta. 



Lectotype. — U.S.N.M. no. 64371 ; paratypes, nos. 64372-3. 



KOCHINA, n. gen. 



Certain Middle Cambrian species resemble Kochiella, but all differ 

 in the same manner and therefore are regarded as a distinct genus. 



Comparisons. — Kochina differs from Kochiella in three respects : 

 First, the brim is narrower so that the preglabellar area is practi- 

 cally eliminated ; second, the converging course of the anterior facial 

 suture greatly reduces the area of brim at the anterior angles ; and 

 third, the eyes have a more anterior position. 



