NO. 4 CAMBRIAN TRILOBITES, 2D CONTRIBUTION RESSER 2/ 



Poulsenia bullata (Poulsen) 



Solcnopleura bullata Poulskn, Meddels. Gr^nland, vol. 70, p. 266, pi. 15, figs. 

 24, 25, 1927. 



Occurrence same as preceding. 



Holotype. — Min. Mus. Copenhagen ; cast, U.S.N.M. no. 70948. 



Poulsenia borealis (Poulsen) 



Solcnopleura borealis Poulsen, Meddels. Gr^nland, vol. 70, p. 266, pi. 15, 

 fig. 27, 1927. 



Occurrence same as preceding. 

 Holotype. — Min. AIus. Copenhagen. 



PTARMINGIA Raymond, 1928 



Ptarmingia gordonensis, n. sp. 



Albertclla Helena Walcott (part), Smithsonian Misc. Coll., vol. 53, no. 2, 

 p. 19, pi. 2, fig. 5, 1908 (see Albertella Helena). 



The Montana species has about the same proportions as P. rossen- 

 sis, but the eyes are smaller and the brim reduced. 



Middle Cambrian, Gordon; (loc. 4v) Gordon Creek, Lewis and 

 Clark Range, Montana. 



Holotype.— U.S.N.M. no. 53408. 



STENOCHILINA Ulrich, 1930 



Stenochilina matutina (Hall) 



.■impluonf mahitina Hall, i6th Ann. Rep. N. Y. State Cab. Nat. Hist., p. 222, 

 pi. 5a, fig. 6, 1863; Trans. Albany Inst., vol. 5, p. 194, 1867. 



Amphion? matutina Walcott, Smithsonian Misc. Coll., vol. 64, no. 3, p. 219, 

 pi. 26, fig. 8, 1916. 



The original description reads as follows : 



Glabella gibbous, longer than wide, subovate, rounded and a little wider 

 in front. Occipital ring narrow and straight ; occipital furrow narrow. Pos- 

 terior lobe a little oblique, the furrow deeply impressed and a little expanded 

 at its inner extremity; median lobe with the sides nearly parallel, separated 

 from the anterior lobe by a narrow distinct furrow ; anterior lobe broad, the 

 length somewhat less than half the entire length of the glabella, a scarcely 

 defined depression extending obliquely from near the middle of its length to 

 the front. 



It seems that this species, which has been unplaced generically for 

 many years, can be definitely put into Stenochilina. 



Upper Cambrian, Eau Claire; (loc. 84) Trempealeau, Wisconsin. 

 Also reported from Dresbach, Minnesota. 



Holotype. — A.M.N.H. no. 349; plesiotype, U.S.N.M. no 61592. 



